/******************************************************************************
** This file is an amalgamation of many separate C source files from SQLite
** version 3.7.11.  By combining all the individual C code files into this 
** single large file, the entire code can be compiled as a single translation
** unit.  This allows many compilers to do optimizations that would not be
** possible if the files were compiled separately.  Performance improvements
** of 5% or more are commonly seen when SQLite is compiled as a single
** translation unit.
**
** This file is all you need to compile SQLite.  To use SQLite in other
................................................................................
** string contains the date and time of the check-in (UTC) and an SHA1
** hash of the entire source tree.
**
** See also: [sqlite3_libversion()],
** [sqlite3_libversion_number()], [sqlite3_sourceid()],
** [sqlite_version()] and [sqlite_source_id()].
*/
#define SQLITE_VERSION        "3.7.11"
#define SQLITE_VERSION_NUMBER 3007011
#define SQLITE_SOURCE_ID      "2012-03-19 14:57:49 bc03d99a78e90c02b69037e5f5f81537b5a3ac60"

/*
** CAPI3REF: Run-Time Library Version Numbers
** KEYWORDS: sqlite3_version, sqlite3_sourceid
**
** These interfaces provide the same information as the [SQLITE_VERSION],
** [SQLITE_VERSION_NUMBER], and [SQLITE_SOURCE_ID] C preprocessor macros
................................................................................
#define SQLITE_IOERR_SHMSIZE           (SQLITE_IOERR | (19<<8))
#define SQLITE_IOERR_SHMLOCK           (SQLITE_IOERR | (20<<8))
#define SQLITE_IOERR_SHMMAP            (SQLITE_IOERR | (21<<8))
#define SQLITE_IOERR_SEEK              (SQLITE_IOERR | (22<<8))
#define SQLITE_LOCKED_SHAREDCACHE      (SQLITE_LOCKED |  (1<<8))
#define SQLITE_BUSY_RECOVERY           (SQLITE_BUSY   |  (1<<8))
#define SQLITE_CANTOPEN_NOTEMPDIR      (SQLITE_CANTOPEN | (1<<8))

#define SQLITE_CORRUPT_VTAB            (SQLITE_CORRUPT | (1<<8))
#define SQLITE_READONLY_RECOVERY       (SQLITE_READONLY | (1<<8))
#define SQLITE_READONLY_CANTLOCK       (SQLITE_READONLY | (2<<8))
#define SQLITE_ABORT_ROLLBACK          (SQLITE_ABORT | (2<<8))

/*
** CAPI3REF: Flags For File Open Operations
................................................................................
** connection is opened. If it is globally disabled, filenames are
** only interpreted as URIs if the SQLITE_OPEN_URI flag is set when the
** database connection is opened. By default, URI handling is globally
** disabled. The default value may be changed by compiling with the
** [SQLITE_USE_URI] symbol defined.
**
** [[SQLITE_CONFIG_PCACHE]] [[SQLITE_CONFIG_GETPCACHE]]
** <dt>SQLITE_CONFIG_PCACHE and SQLITE_CONFNIG_GETPCACHE
** <dd> These options are obsolete and should not be used by new code.
** They are retained for backwards compatibility but are now no-ops.
** </dl>
*/
#define SQLITE_CONFIG_SINGLETHREAD  1  /* nil */
#define SQLITE_CONFIG_MULTITHREAD   2  /* nil */
#define SQLITE_CONFIG_SERIALIZED    3  /* nil */
................................................................................
** </dd>
**
** [[SQLITE_DBSTATUS_CACHE_MISS]] ^(<dt>SQLITE_DBSTATUS_CACHE_MISS</dt>
** <dd>This parameter returns the number of pager cache misses that have
** occurred.)^ ^The highwater mark associated with SQLITE_DBSTATUS_CACHE_MISS 
** is always 0.
** </dd>











** </dl>
*/
#define SQLITE_DBSTATUS_LOOKASIDE_USED       0
#define SQLITE_DBSTATUS_CACHE_USED           1
#define SQLITE_DBSTATUS_SCHEMA_USED          2
#define SQLITE_DBSTATUS_STMT_USED            3
#define SQLITE_DBSTATUS_LOOKASIDE_HIT        4
#define SQLITE_DBSTATUS_LOOKASIDE_MISS_SIZE  5
#define SQLITE_DBSTATUS_LOOKASIDE_MISS_FULL  6
#define SQLITE_DBSTATUS_CACHE_HIT            7
#define SQLITE_DBSTATUS_CACHE_MISS           8

#define SQLITE_DBSTATUS_MAX                  8   /* Largest defined DBSTATUS */


/*
** CAPI3REF: Prepared Statement Status
**
** ^(Each prepared statement maintains various
** [SQLITE_STMTSTATUS counters] that measure the number
................................................................................
** R-Tree geometry query as follows:
**
**   SELECT ... FROM <rtree> WHERE <rtree col> MATCH $zGeom(... params ...)
*/
SQLITE_API int sqlite3_rtree_geometry_callback(
  sqlite3 *db,
  const char *zGeom,



  int (*xGeom)(sqlite3_rtree_geometry *, int nCoord, double *aCoord, int *pRes),

  void *pContext
);


/*
** A pointer to a structure of the following type is passed as the first
** argument to callbacks registered using rtree_geometry_callback().
................................................................................
struct FuncDestructor {
  int nRef;
  void (*xDestroy)(void *);
  void *pUserData;
};

/*
** Possible values for FuncDef.flags


*/
#define SQLITE_FUNC_LIKE     0x01 /* Candidate for the LIKE optimization */
#define SQLITE_FUNC_CASE     0x02 /* Case-sensitive LIKE-type function */
#define SQLITE_FUNC_EPHEM    0x04 /* Ephemeral.  Delete with VDBE */
#define SQLITE_FUNC_NEEDCOLL 0x08 /* sqlite3GetFuncCollSeq() might be called */
#define SQLITE_FUNC_COUNT    0x20 /* Built-in count(*) aggregate */
#define SQLITE_FUNC_COALESCE 0x40 /* Built-in coalesce() or ifnull() function */



/*
** The following three macros, FUNCTION(), LIKEFUNC() and AGGREGATE() are
** used to create the initializers for the FuncDef structures.
**
**   FUNCTION(zName, nArg, iArg, bNC, xFunc)
**     Used to create a scalar function definition of a function zName 
................................................................................
**     that accepts nArg arguments and is implemented by a call to C 
**     function likeFunc. Argument pArg is cast to a (void *) and made
**     available as the function user-data (sqlite3_user_data()). The
**     FuncDef.flags variable is set to the value passed as the flags
**     parameter.
*/
#define FUNCTION(zName, nArg, iArg, bNC, xFunc) \
  {nArg, SQLITE_UTF8, bNC*SQLITE_FUNC_NEEDCOLL, \



   SQLITE_INT_TO_PTR(iArg), 0, xFunc, 0, 0, #zName, 0, 0}
#define STR_FUNCTION(zName, nArg, pArg, bNC, xFunc) \
  {nArg, SQLITE_UTF8, bNC*SQLITE_FUNC_NEEDCOLL, \
   pArg, 0, xFunc, 0, 0, #zName, 0, 0}
#define LIKEFUNC(zName, nArg, arg, flags) \
  {nArg, SQLITE_UTF8, flags, (void *)arg, 0, likeFunc, 0, 0, #zName, 0, 0}
#define AGGREGATE(zName, nArg, arg, nc, xStep, xFinal) \
................................................................................
  Select *pSelect;     /* NULL for tables.  Points to definition if a view. */
  u16 nRef;            /* Number of pointers to this Table */
  u8 tabFlags;         /* Mask of TF_* values */
  u8 keyConf;          /* What to do in case of uniqueness conflict on iPKey */
  FKey *pFKey;         /* Linked list of all foreign keys in this table */
  char *zColAff;       /* String defining the affinity of each column */
#ifndef SQLITE_OMIT_CHECK
  Expr *pCheck;        /* The AND of all CHECK constraints */
#endif
#ifndef SQLITE_OMIT_ALTERTABLE
  int addColOffset;    /* Offset in CREATE TABLE stmt to add a new column */
#endif
#ifndef SQLITE_OMIT_VIRTUALTABLE
  VTable *pVTable;     /* List of VTable objects. */
  int nModuleArg;      /* Number of arguments to the module */
................................................................................
                         ** TK_TRIGGER: 1 -> new, 0 -> old */
  ynVar iColumn;         /* TK_COLUMN: column index.  -1 for rowid.
                         ** TK_VARIABLE: variable number (always >= 1). */
  i16 iAgg;              /* Which entry in pAggInfo->aCol[] or ->aFunc[] */
  i16 iRightJoinTable;   /* If EP_FromJoin, the right table of the join */
  u8 flags2;             /* Second set of flags.  EP2_... */
  u8 op2;                /* If a TK_REGISTER, the original value of Expr.op */

  AggInfo *pAggInfo;     /* Used by TK_AGG_COLUMN and TK_AGG_FUNCTION */
  Table *pTab;           /* Table for TK_COLUMN expressions. */
#if SQLITE_MAX_EXPR_DEPTH>0
  int nHeight;           /* Height of the tree headed by this node */
#endif
};

................................................................................
#define EP_VarSelect  0x0020  /* pSelect is correlated, not constant */
#define EP_DblQuoted  0x0040  /* token.z was originally in "..." */
#define EP_InfixFunc  0x0080  /* True for an infix function: LIKE, GLOB, etc */
#define EP_ExpCollate 0x0100  /* Collating sequence specified explicitly */
#define EP_FixedDest  0x0200  /* Result needed in a specific register */
#define EP_IntValue   0x0400  /* Integer value contained in u.iValue */
#define EP_xIsSelect  0x0800  /* x.pSelect is valid (otherwise x.pList is) */
#define EP_Hint       0x1000  /* Optimizer hint. Not required for correctness */
#define EP_Reduced    0x2000  /* Expr struct is EXPR_REDUCEDSIZE bytes only */
#define EP_TokenOnly  0x4000  /* Expr struct is EXPR_TOKENONLYSIZE bytes only */
#define EP_Static     0x8000  /* Held in memory not obtained from malloc() */

/*
** The following are the meanings of bits in the Expr.flags2 field.
*/
................................................................................
  SrcList *pSrcList;   /* One or more tables used to resolve names */
  ExprList *pEList;    /* Optional list of named expressions */
  int nRef;            /* Number of names resolved by this context */
  int nErr;            /* Number of errors encountered while resolving names */
  u8 allowAgg;         /* Aggregate functions allowed here */
  u8 hasAgg;           /* True if aggregates are seen */
  u8 isCheck;          /* True if resolving names in a CHECK constraint */
  int nDepth;          /* Depth of subquery recursion. 1 for no recursion */
  AggInfo *pAggInfo;   /* Information about aggregates at this level */
  NameContext *pNext;  /* Next outer name context.  NULL for outermost */
};

/*
** An instance of the following structure contains all information
** needed to generate code for a single SELECT statement.
................................................................................
  yDbMask writeMask;   /* Start a write transaction on these databases */
  yDbMask cookieMask;  /* Bitmask of schema verified databases */
  int cookieGoto;      /* Address of OP_Goto to cookie verifier subroutine */
  int cookieValue[SQLITE_MAX_ATTACHED+2];  /* Values of cookies to verify */
  int regRowid;        /* Register holding rowid of CREATE TABLE entry */
  int regRoot;         /* Register holding root page number for new objects */
  int nMaxArg;         /* Max args passed to user function by sub-program */

#ifndef SQLITE_OMIT_SHARED_CACHE
  int nTableLock;        /* Number of locks in aTableLock */
  TableLock *aTableLock; /* Required table locks for shared-cache mode */
#endif
  AutoincInfo *pAinc;  /* Information about AUTOINCREMENT counters */

  /* Information used while coding trigger programs. */
................................................................................
*/
struct AuthContext {
  const char *zAuthContext;   /* Put saved Parse.zAuthContext here */
  Parse *pParse;              /* The Parse structure */
};

/*
** Bitfield flags for P5 value in OP_Insert and OP_Delete
*/
#define OPFLAG_NCHANGE       0x01    /* Set to update db->nChange */
#define OPFLAG_LASTROWID     0x02    /* Set to update db->lastRowid */
#define OPFLAG_ISUPDATE      0x04    /* This OP_Insert is an sql UPDATE */
#define OPFLAG_APPEND        0x08    /* This is likely to be an append */
#define OPFLAG_USESEEKRESULT 0x10    /* Try to avoid a seek in BtreeInsert() */
#define OPFLAG_CLEARCACHE    0x20    /* Clear pseudo-table cache in OP_Column */



/*
 * Each trigger present in the database schema is stored as an instance of
 * struct Trigger. 
 *
 * Pointers to instances of struct Trigger are stored in two ways.
 * 1. In the "trigHash" hash table (part of the sqlite3* that represents the 
................................................................................
struct Walker {
  int (*xExprCallback)(Walker*, Expr*);     /* Callback for expressions */
  int (*xSelectCallback)(Walker*,Select*);  /* Callback for SELECTs */
  Parse *pParse;                            /* Parser context.  */
  union {                                   /* Extra data for callback */
    NameContext *pNC;                          /* Naming context */
    int i;                                     /* Integer value */

  } u;
};

/* Forward declarations */
SQLITE_PRIVATE int sqlite3WalkExpr(Walker*, Expr*);
SQLITE_PRIVATE int sqlite3WalkExprList(Walker*, ExprList*);
SQLITE_PRIVATE int sqlite3WalkSelect(Walker*, Select*);
................................................................................
#if defined(SQLITE_ENABLE_UPDATE_DELETE_LIMIT) && !defined(SQLITE_OMIT_SUBQUERY)
SQLITE_PRIVATE Expr *sqlite3LimitWhere(Parse *, SrcList *, Expr *, ExprList *, Expr *, Expr *, char *);
#endif
SQLITE_PRIVATE void sqlite3DeleteFrom(Parse*, SrcList*, Expr*);
SQLITE_PRIVATE void sqlite3Update(Parse*, SrcList*, ExprList*, Expr*, int);
SQLITE_PRIVATE WhereInfo *sqlite3WhereBegin(Parse*, SrcList*, Expr*, ExprList**,ExprList*,u16);
SQLITE_PRIVATE void sqlite3WhereEnd(WhereInfo*);
SQLITE_PRIVATE int sqlite3ExprCodeGetColumn(Parse*, Table*, int, int, int);
SQLITE_PRIVATE void sqlite3ExprCodeGetColumnOfTable(Vdbe*, Table*, int, int, int);
SQLITE_PRIVATE void sqlite3ExprCodeMove(Parse*, int, int, int);
SQLITE_PRIVATE void sqlite3ExprCodeCopy(Parse*, int, int, int);
SQLITE_PRIVATE void sqlite3ExprCacheStore(Parse*, int, int, int);
SQLITE_PRIVATE void sqlite3ExprCachePush(Parse*);
SQLITE_PRIVATE void sqlite3ExprCachePop(Parse*, int);
SQLITE_PRIVATE void sqlite3ExprCacheRemove(Parse*, int, int);
................................................................................
SQLITE_PRIVATE void sqlite3HaltConstraint(Parse*, int, char*, int);
SQLITE_PRIVATE Expr *sqlite3ExprDup(sqlite3*,Expr*,int);
SQLITE_PRIVATE ExprList *sqlite3ExprListDup(sqlite3*,ExprList*,int);
SQLITE_PRIVATE SrcList *sqlite3SrcListDup(sqlite3*,SrcList*,int);
SQLITE_PRIVATE IdList *sqlite3IdListDup(sqlite3*,IdList*);
SQLITE_PRIVATE Select *sqlite3SelectDup(sqlite3*,Select*,int);
SQLITE_PRIVATE void sqlite3FuncDefInsert(FuncDefHash*, FuncDef*);
SQLITE_PRIVATE FuncDef *sqlite3FindFunction(sqlite3*,const char*,int,int,u8,int);
SQLITE_PRIVATE void sqlite3RegisterBuiltinFunctions(sqlite3*);
SQLITE_PRIVATE void sqlite3RegisterDateTimeFunctions(void);
SQLITE_PRIVATE void sqlite3RegisterGlobalFunctions(void);
SQLITE_PRIVATE int sqlite3SafetyCheckOk(sqlite3*);
SQLITE_PRIVATE int sqlite3SafetyCheckSickOrOk(sqlite3*);
SQLITE_PRIVATE void sqlite3ChangeCookie(Parse*, int);

................................................................................

    /*
    ** Set *pCurrent to the total cache hits or misses encountered by all
    ** pagers the database handle is connected to. *pHighwater is always set 
    ** to zero.
    */
    case SQLITE_DBSTATUS_CACHE_HIT:
    case SQLITE_DBSTATUS_CACHE_MISS: {

      int i;
      int nRet = 0;
      assert( SQLITE_DBSTATUS_CACHE_MISS==SQLITE_DBSTATUS_CACHE_HIT+1 );


      for(i=0; i<db->nDb; i++){
        if( db->aDb[i].pBt ){
          Pager *pPager = sqlite3BtreePager(db->aDb[i].pBt);
          sqlite3PagerCacheStat(pPager, op, resetFlag, &nRet);
        }
      }
................................................................................
/* Convenient short-hand */
#define UpperToLower sqlite3UpperToLower

/*
** Some systems have stricmp().  Others have strcasecmp().  Because
** there is no consistency, we will define our own.
**
** IMPLEMENTATION-OF: R-20522-24639 The sqlite3_strnicmp() API allows

** applications and extensions to compare the contents of two buffers
** containing UTF-8 strings in a case-independent fashion, using the same
** definition of case independence that SQLite uses internally when
** comparing identifiers.
*/
SQLITE_API int sqlite3_stricmp(const char *zLeft, const char *zRight){
  register unsigned char *a, *b;
  a = (unsigned char *)zLeft;
  b = (unsigned char *)zRight;
  while( *a!=0 && UpperToLower[*a]==UpperToLower[*b]){ a++; b++; }
  return UpperToLower[*a] - UpperToLower[*b];
................................................................................
** Default permissions when creating a new file
*/
#ifndef SQLITE_DEFAULT_FILE_PERMISSIONS
# define SQLITE_DEFAULT_FILE_PERMISSIONS 0644
#endif

/*
 ** Default permissions when creating auto proxy dir
 */
#ifndef SQLITE_DEFAULT_PROXYDIR_PERMISSIONS
# define SQLITE_DEFAULT_PROXYDIR_PERMISSIONS 0755
#endif

/*
** Maximum supported path-length.
*/
................................................................................
    if( aSyscall[i].pCurrent!=0 ) return aSyscall[i].zName;
  }
  return 0;
}

/*
** Invoke open().  Do so multiple times, until it either succeeds or
** files for some reason other than EINTR.
**
** If the file creation mode "m" is 0 then set it to the default for
** SQLite.  The default is SQLITE_DEFAULT_FILE_PERMISSIONS (normally
** 0644) as modified by the system umask.  If m is not 0, then
** make the file creation mode be exactly m ignoring the umask.
**
** The m parameter will be non-zero only when creating -wal, -journal,
................................................................................
** permissions as their original database, unadulterated by the umask.
** In that way, if a database file is -rw-rw-rw or -rw-rw-r-, and a
** transaction crashes and leaves behind hot journals, then any
** process that is able to write to the database will also be able to
** recover the hot journals.
*/
static int robust_open(const char *z, int f, mode_t m){
  int rc;
  mode_t m2;
  mode_t origM = 0;
  if( m==0 ){
    m2 = SQLITE_DEFAULT_FILE_PERMISSIONS;
  }else{
    m2 = m;
    origM = osUmask(0);
  }






  do{ rc = osOpen(z,f,m2); }while( rc<0 && errno==EINTR );
  if( m ){
    osUmask(origM);
  }



  return rc;
}

/*
** Helper functions to obtain and relinquish the global mutex. The
** global mutex is used to protect the unixInodeInfo and
** vxworksFileId objects used by this file, all of which may be 
** shared by multiple threads.
................................................................................

  sqlite3_snprintf(MAX_PATHNAME, zDirname, "%s", zFilename);
  for(ii=(int)strlen(zDirname); ii>1 && zDirname[ii]!='/'; ii--);
  if( ii>0 ){
    zDirname[ii] = '\0';
    fd = robust_open(zDirname, O_RDONLY|O_BINARY, 0);
    if( fd>=0 ){
#ifdef FD_CLOEXEC
      osFcntl(fd, F_SETFD, osFcntl(fd, F_GETFD, 0) | FD_CLOEXEC);
#endif
      OSTRACE(("OPENDIR %-3d %s\n", fd, zDirname));
    }
  }
  *pFd = fd;
  return (fd>=0?SQLITE_OK:unixLogError(SQLITE_CANTOPEN_BKPT, "open", zDirname));
}

................................................................................
  SimulateIOError( return SQLITE_IOERR_TRUNCATE );

  /* If the user has configured a chunk-size for this file, truncate the
  ** file so that it consists of an integer number of chunks (i.e. the
  ** actual file size after the operation may be larger than the requested
  ** size).
  */
  if( pFile->szChunk ){
    nByte = ((nByte + pFile->szChunk - 1)/pFile->szChunk) * pFile->szChunk;
  }

  rc = robust_ftruncate(pFile->h, (off_t)nByte);
  if( rc ){
    pFile->lastErrno = errno;
    return unixLogError(SQLITE_IOERR_TRUNCATE, "ftruncate", pFile->zPath);
................................................................................
  }
#if SQLITE_ENABLE_LOCKING_STYLE
  else{
    p->openFlags = openFlags;
  }
#endif

#ifdef FD_CLOEXEC
  osFcntl(fd, F_SETFD, osFcntl(fd, F_GETFD, 0) | FD_CLOEXEC);
#endif

  noLock = eType!=SQLITE_OPEN_MAIN_DB;

  
#if defined(__APPLE__) || SQLITE_ENABLE_LOCKING_STYLE
  if( fstatfs(fd, &fsInfo) == -1 ){
    ((unixFile*)pFile)->lastErrno = errno;
    robust_close(p, fd, __LINE__);
................................................................................
    ){
       osSleep(100);  /* Wait a little before trying again */
    }
    sqlite3_free(pFile->zDeleteOnClose);
  }
#endif
  OSTRACE(("CLOSE %d %s\n", pFile->h, rc ? "ok" : "failed"));



  OpenCounter(-1);
  return rc ? SQLITE_OK
            : winLogError(SQLITE_IOERR_CLOSE, osGetLastError(),
                          "winClose", pFile->zPath);
}

/*
................................................................................
*/
static int winRead(
  sqlite3_file *id,          /* File to read from */
  void *pBuf,                /* Write content into this buffer */
  int amt,                   /* Number of bytes to read */
  sqlite3_int64 offset       /* Begin reading at this offset */
){



  winFile *pFile = (winFile*)id;  /* file handle */
  DWORD nRead;                    /* Number of bytes actually read from file */
  int nRetry = 0;                 /* Number of retrys */

  assert( id!=0 );
  SimulateIOError(return SQLITE_IOERR_READ);
  OSTRACE(("READ %d lock=%d\n", pFile->h, pFile->locktype));


  if( seekWinFile(pFile, offset) ){
    return SQLITE_FULL;
  }
  while( !osReadFile(pFile->h, pBuf, amt, &nRead, 0) ){







    DWORD lastErrno;
    if( retryIoerr(&nRetry, &lastErrno) ) continue;
    pFile->lastErrno = lastErrno;
    return winLogError(SQLITE_IOERR_READ, pFile->lastErrno,
             "winRead", pFile->zPath);
  }
  logIoerr(nRetry);
................................................................................
*/
static int winWrite(
  sqlite3_file *id,               /* File to write into */
  const void *pBuf,               /* The bytes to be written */
  int amt,                        /* Number of bytes to write */
  sqlite3_int64 offset            /* Offset into the file to begin writing at */
){
  int rc;                         /* True if error has occured, else false */
  winFile *pFile = (winFile*)id;  /* File handle */
  int nRetry = 0;                 /* Number of retries */

  assert( amt>0 );
  assert( pFile );
  SimulateIOError(return SQLITE_IOERR_WRITE);
  SimulateDiskfullError(return SQLITE_FULL);

  OSTRACE(("WRITE %d lock=%d\n", pFile->h, pFile->locktype));


  rc = seekWinFile(pFile, offset);
  if( rc==0 ){






    u8 *aRem = (u8 *)pBuf;        /* Data yet to be written */
    int nRem = amt;               /* Number of bytes yet to be written */
    DWORD nWrite;                 /* Bytes written by each WriteFile() call */
    DWORD lastErrno = NO_ERROR;   /* Value returned by GetLastError() */







    while( nRem>0 ){

      if( !osWriteFile(pFile->h, aRem, nRem, &nWrite, 0) ){



        if( retryIoerr(&nRetry, &lastErrno) ) continue;
        break;
      }
      if( nWrite<=0 ) break;








      aRem += nWrite;
      nRem -= nWrite;
    }
    if( nRem>0 ){
      pFile->lastErrno = lastErrno;
      rc = 1;
    }
................................................................................
  }
  zBuf[j] = 0;
  zBuf[j+1] = 0;

  OSTRACE(("TEMP FILENAME: %s\n", zBuf));
  return SQLITE_OK; 
}






























/*
** Open a file.
*/
static int winOpen(
  sqlite3_vfs *pVfs,        /* Not used */
  const char *zName,        /* Name of the file (UTF-8) */
................................................................................
        zUtf8Name[strlen(zUtf8Name)+1]==0 );

  /* Convert the filename to the system encoding. */
  zConverted = convertUtf8Filename(zUtf8Name);
  if( zConverted==0 ){
    return SQLITE_IOERR_NOMEM;
  }






  if( isReadWrite ){
    dwDesiredAccess = GENERIC_READ | GENERIC_WRITE;
  }else{
    dwDesiredAccess = GENERIC_READ;
  }

................................................................................
  if( isNT() ){
    while( (h = osCreateFileW((LPCWSTR)zConverted,
                              dwDesiredAccess,
                              dwShareMode, NULL,
                              dwCreationDisposition,
                              dwFlagsAndAttributes,
                              NULL))==INVALID_HANDLE_VALUE &&
                              retryIoerr(&cnt, &lastErrno) ){}
/* isNT() is 1 if SQLITE_OS_WINCE==1, so this else is never executed. 
** Since the ANSI version of these Windows API do not exist for WINCE,
** it's important to not reference them for WINCE builds.
*/

#if SQLITE_OS_WINCE==0
  }else{
    while( (h = osCreateFileA((LPCSTR)zConverted,
                              dwDesiredAccess,
                              dwShareMode, NULL,
                              dwCreationDisposition,
                              dwFlagsAndAttributes,
                              NULL))==INVALID_HANDLE_VALUE &&
                              retryIoerr(&cnt, &lastErrno) ){}


#endif
  }

  logIoerr(cnt);

  OSTRACE(("OPEN %d %s 0x%lx %s\n", 
           h, zName, dwDesiredAccess, 
................................................................................
static int winDelete(
  sqlite3_vfs *pVfs,          /* Not used on win32 */
  const char *zFilename,      /* Name of file to delete */
  int syncDir                 /* Not used on win32 */
){
  int cnt = 0;
  int rc;

  DWORD lastErrno;
  void *zConverted;
  UNUSED_PARAMETER(pVfs);
  UNUSED_PARAMETER(syncDir);

  SimulateIOError(return SQLITE_IOERR_DELETE);
  zConverted = convertUtf8Filename(zFilename);
  if( zConverted==0 ){
    return SQLITE_IOERR_NOMEM;
  }
  if( isNT() ){
    rc = 1;
    while( osGetFileAttributesW(zConverted)!=INVALID_FILE_ATTRIBUTES &&












         (rc = osDeleteFileW(zConverted))==0 && retryIoerr(&cnt, &lastErrno) ){}
    rc = rc ? SQLITE_OK : SQLITE_ERROR;




/* isNT() is 1 if SQLITE_OS_WINCE==1, so this else is never executed. 
** Since the ANSI version of these Windows API do not exist for WINCE,
** it's important to not reference them for WINCE builds.
*/
#if SQLITE_OS_WINCE==0
  }else{
    rc = 1;
    while( osGetFileAttributesA(zConverted)!=INVALID_FILE_ATTRIBUTES &&












         (rc = osDeleteFileA(zConverted))==0 && retryIoerr(&cnt, &lastErrno) ){}
    rc = rc ? SQLITE_OK : SQLITE_ERROR;




#endif
  }
  if( rc ){
    rc = winLogError(SQLITE_IOERR_DELETE, lastErrno,
             "winDelete", zFilename);
  }else{
    logIoerr(cnt);
................................................................................
** The number of rowset entries per allocation chunk.
*/
#define ROWSET_ENTRY_PER_CHUNK  \
                       ((ROWSET_ALLOCATION_SIZE-8)/sizeof(struct RowSetEntry))

/*
** Each entry in a RowSet is an instance of the following object.





*/
struct RowSetEntry {            
  i64 v;                        /* ROWID value for this entry */
  struct RowSetEntry *pRight;   /* Right subtree (larger entries) or list */
  struct RowSetEntry *pLeft;    /* Left subtree (smaller entries) */
};

................................................................................
*/
struct RowSet {
  struct RowSetChunk *pChunk;    /* List of all chunk allocations */
  sqlite3 *db;                   /* The database connection */
  struct RowSetEntry *pEntry;    /* List of entries using pRight */
  struct RowSetEntry *pLast;     /* Last entry on the pEntry list */
  struct RowSetEntry *pFresh;    /* Source of new entry objects */
  struct RowSetEntry *pTree;     /* Binary tree of entries */
  u16 nFresh;                    /* Number of objects on pFresh */
  u8 isSorted;                   /* True if pEntry is sorted */
  u8 iBatch;                     /* Current insert batch */
};







/*
** Turn bulk memory into a RowSet object.  N bytes of memory
** are available at pSpace.  The db pointer is used as a memory context
** for any subsequent allocations that need to occur.
** Return a pointer to the new RowSet object.
**
** It must be the case that N is sufficient to make a Rowset.  If not
................................................................................
  RowSet *p;
  assert( N >= ROUND8(sizeof(*p)) );
  p = pSpace;
  p->pChunk = 0;
  p->db = db;
  p->pEntry = 0;
  p->pLast = 0;
  p->pTree = 0;
  p->pFresh = (struct RowSetEntry*)(ROUND8(sizeof(*p)) + (char*)p);
  p->nFresh = (u16)((N - ROUND8(sizeof(*p)))/sizeof(struct RowSetEntry));
  p->isSorted = 1;
  p->iBatch = 0;
  return p;
}

/*
** Deallocate all chunks from a RowSet.  This frees all memory that
** the RowSet has allocated over its lifetime.  This routine is
................................................................................
    pNextChunk = pChunk->pNextChunk;
    sqlite3DbFree(p->db, pChunk);
  }
  p->pChunk = 0;
  p->nFresh = 0;
  p->pEntry = 0;
  p->pLast = 0;
  p->pTree = 0;
  p->isSorted = 1;

























}

/*
** Insert a new value into a RowSet.
**
** The mallocFailed flag of the database connection is set if a
** memory allocation fails.
*/
SQLITE_PRIVATE void sqlite3RowSetInsert(RowSet *p, i64 rowid){
  struct RowSetEntry *pEntry;  /* The new entry */
  struct RowSetEntry *pLast;   /* The last prior entry */
  assert( p!=0 );
  if( p->nFresh==0 ){
    struct RowSetChunk *pNew;
    pNew = sqlite3DbMallocRaw(p->db, sizeof(*pNew));
    if( pNew==0 ){
      return;
    }
    pNew->pNextChunk = p->pChunk;
    p->pChunk = pNew;
    p->pFresh = pNew->aEntry;
    p->nFresh = ROWSET_ENTRY_PER_CHUNK;


  }
  pEntry = p->pFresh++;
  p->nFresh--;


  pEntry->v = rowid;
  pEntry->pRight = 0;
  pLast = p->pLast;
  if( pLast ){
    if( p->isSorted && rowid<=pLast->v ){
      p->isSorted = 0;
    }
    pLast->pRight = pEntry;
  }else{
    assert( p->pEntry==0 ); /* Fires if INSERT after SMALLEST */
    p->pEntry = pEntry;
  }
  p->pLast = pEntry;
}

/*
** Merge two lists of RowSetEntry objects.  Remove duplicates.
**
** The input lists are connected via pRight pointers and are 
** assumed to each already be in sorted order.
*/
static struct RowSetEntry *rowSetMerge(
  struct RowSetEntry *pA,    /* First sorted list to be merged */
  struct RowSetEntry *pB     /* Second sorted list to be merged */
){
  struct RowSetEntry head;
  struct RowSetEntry *pTail;

  pTail = &head;
................................................................................
    assert( pB==0 || pB->pRight==0 || pB->v<=pB->pRight->v );
    pTail->pRight = pB;
  }
  return head.pRight;
}

/*
** Sort all elements on the pEntry list of the RowSet into ascending order.

*/ 
static void rowSetSort(RowSet *p){

  unsigned int i;
  struct RowSetEntry *pEntry;
  struct RowSetEntry *aBucket[40];

  assert( p->isSorted==0 );
  memset(aBucket, 0, sizeof(aBucket));
  while( p->pEntry ){
    pEntry = p->pEntry;
    p->pEntry = pEntry->pRight;
    pEntry->pRight = 0;
    for(i=0; aBucket[i]; i++){
      pEntry = rowSetMerge(aBucket[i], pEntry);
      aBucket[i] = 0;
    }
    aBucket[i] = pEntry;

  }
  pEntry = 0;
  for(i=0; i<sizeof(aBucket)/sizeof(aBucket[0]); i++){
    pEntry = rowSetMerge(pEntry, aBucket[i]);

  }
  p->pEntry = pEntry;
  p->pLast = 0;
  p->isSorted = 1;

}


/*
** The input, pIn, is a binary tree (or subtree) of RowSetEntry objects.
** Convert this tree into a linked list connected by the pRight pointers
** and return pointers to the first and last elements of the new list.
................................................................................
    p->pLeft = pLeft;
    p->pRight = rowSetNDeepTree(&pList, iDepth);
  }
  return p;
}

/*
** Convert the list in p->pEntry into a sorted list if it is not
** sorted already.  If there is a binary tree on p->pTree, then
** convert it into a list too and merge it into the p->pEntry list.

*/
static void rowSetToList(RowSet *p){
  if( !p->isSorted ){
    rowSetSort(p);
  }















  if( p->pTree ){
    struct RowSetEntry *pHead, *pTail;
    rowSetTreeToList(p->pTree, &pHead, &pTail);
    p->pTree = 0;
    p->pEntry = rowSetMerge(p->pEntry, pHead);
  }




}

/*
** Extract the smallest element from the RowSet.
** Write the element into *pRowid.  Return 1 on success.  Return
** 0 if the RowSet is already empty.
**
** After this routine has been called, the sqlite3RowSetInsert()
** routine may not be called again.  
*/
SQLITE_PRIVATE int sqlite3RowSetNext(RowSet *p, i64 *pRowid){



  rowSetToList(p);


  if( p->pEntry ){
    *pRowid = p->pEntry->v;
    p->pEntry = p->pEntry->pRight;
    if( p->pEntry==0 ){
      sqlite3RowSetClear(p);
    }
    return 1;
................................................................................
    return 0;
  }
}

/*
** Check to see if element iRowid was inserted into the the rowset as
** part of any insert batch prior to iBatch.  Return 1 or 0.




*/
SQLITE_PRIVATE int sqlite3RowSetTest(RowSet *pRowSet, u8 iBatch, sqlite3_int64 iRowid){
  struct RowSetEntry *p;






  if( iBatch!=pRowSet->iBatch ){
    if( pRowSet->pEntry ){
      rowSetToList(pRowSet);








      pRowSet->pTree = rowSetListToTree(pRowSet->pEntry);
















      pRowSet->pEntry = 0;
      pRowSet->pLast = 0;

    }
    pRowSet->iBatch = iBatch;
  }
  p = pRowSet->pTree;






  while( p ){
    if( p->v<iRowid ){
      p = p->pRight;
    }else if( p->v>iRowid ){
      p = p->pLeft;
    }else{
      return 1;

    }
  }
  return 0;
}

/************** End of rowset.c **********************************************/
/************** Begin file pager.c *******************************************/
................................................................................
  int pageSize;               /* Number of bytes in a page */
  Pgno mxPgno;                /* Maximum allowed size of the database */
  i64 journalSizeLimit;       /* Size limit for persistent journal files */
  char *zFilename;            /* Name of the database file */
  char *zJournal;             /* Name of the journal file */
  int (*xBusyHandler)(void*); /* Function to call when busy */
  void *pBusyHandlerArg;      /* Context argument for xBusyHandler */
  int nHit, nMiss;            /* Total cache hits and misses */
#ifdef SQLITE_TEST
  int nRead, nWrite;          /* Database pages read/written */
#endif
  void (*xReiniter)(DbPage*); /* Call this routine when reloading pages */
#ifdef SQLITE_HAS_CODEC
  void *(*xCodec)(void*,void*,Pgno,int); /* Routine for en/decoding data */
  void (*xCodecSizeChng)(void*,int,int); /* Notify of page size changes */
  void (*xCodecFree)(void*);             /* Destructor for the codec */
  void *pCodec;               /* First argument to xCodec... methods */
................................................................................
  PCache *pPCache;            /* Pointer to page cache object */
#ifndef SQLITE_OMIT_WAL
  Wal *pWal;                  /* Write-ahead log used by "journal_mode=wal" */
  char *zWal;                 /* File name for write-ahead log */
#endif
};










/*
** The following global variables hold counters used for
** testing purposes only.  These variables do not exist in
** a non-testing build.  These variables are not thread-safe.
*/
#ifdef SQLITE_TEST
SQLITE_API int sqlite3_pager_readdb_count = 0;    /* Number of full pages read from DB */
................................................................................
static int pagerWalFrames(
  Pager *pPager,                  /* Pager object */
  PgHdr *pList,                   /* List of frames to log */
  Pgno nTruncate,                 /* Database size after this commit */
  int isCommit                    /* True if this is a commit */
){
  int rc;                         /* Return code */

#if defined(SQLITE_DEBUG) || defined(SQLITE_CHECK_PAGES)
  PgHdr *p;                       /* For looping over pages */
#endif

  assert( pPager->pWal );
  assert( pList );
#ifdef SQLITE_DEBUG
  /* Verify that the page list is in accending order */
  for(p=pList; p && p->pDirty; p=p->pDirty){
    assert( p->pgno < p->pDirty->pgno );
  }
#endif


  if( isCommit ){
    /* If a WAL transaction is being committed, there is no point in writing
    ** any pages with page numbers greater than nTruncate into the WAL file.
    ** They will never be read by any client. So remove them from the pDirty
    ** list here. */
    PgHdr *p;
    PgHdr **ppNext = &pList;

    for(p=pList; (*ppNext = p); p=p->pDirty){
      if( p->pgno<=nTruncate ) ppNext = &p->pDirty;


    }

    assert( pList );


  }


  if( pList->pgno==1 ) pager_write_changecounter(pList);
  rc = sqlite3WalFrames(pPager->pWal, 
      pPager->pageSize, pList, nTruncate, isCommit, pPager->walSyncFlags
  );
  if( rc==SQLITE_OK && pPager->pBackup ){
    PgHdr *p;
................................................................................
      */
      if( pgno==1 ){
        memcpy(&pPager->dbFileVers, &pData[24], sizeof(pPager->dbFileVers));
      }
      if( pgno>pPager->dbFileSize ){
        pPager->dbFileSize = pgno;
      }


      /* Update any backup objects copying the contents of this pager. */
      sqlite3BackupUpdate(pPager->pBackup, pgno, (u8*)pList->pData);

      PAGERTRACE(("STORE %d page %d hash(%08x)\n",
                   PAGERID(pPager), pgno, pager_pagehash(pList)));
      IOTRACE(("PGOUT %p %d\n", pPager, pgno));
      PAGER_INCR(sqlite3_pager_writedb_count);
      PAGER_INCR(pPager->nWrite);
    }else{
      PAGERTRACE(("NOSTORE %d page %d\n", PAGERID(pPager), pgno));
    }
    pager_set_pagehash(pList);
    pList = pList->pDirty;
  }

................................................................................
  assert( (*ppPage)->pgno==pgno );
  assert( (*ppPage)->pPager==pPager || (*ppPage)->pPager==0 );

  if( (*ppPage)->pPager && !noContent ){
    /* In this case the pcache already contains an initialized copy of
    ** the page. Return without further ado.  */
    assert( pgno<=PAGER_MAX_PGNO && pgno!=PAGER_MJ_PGNO(pPager) );
    pPager->nHit++;
    return SQLITE_OK;

  }else{
    /* The pager cache has created a new page. Its content needs to 
    ** be initialized.  */

    pPg = *ppPage;
................................................................................
        testcase( rc==SQLITE_NOMEM );
        sqlite3EndBenignMalloc();
      }
      memset(pPg->pData, 0, pPager->pageSize);
      IOTRACE(("ZERO %p %d\n", pPager, pgno));
    }else{
      assert( pPg->pPager==pPager );
      pPager->nMiss++;
      rc = readDbPage(pPg);
      if( rc!=SQLITE_OK ){
        goto pager_acquire_err;
      }
    }
    pager_set_pagehash(pPg);
  }
................................................................................
      /* If running in direct mode, write the contents of page 1 to the file. */
      if( DIRECT_MODE ){
        const void *zBuf;
        assert( pPager->dbFileSize>0 );
        CODEC2(pPager, pPgHdr->pData, 1, 6, rc=SQLITE_NOMEM, zBuf);
        if( rc==SQLITE_OK ){
          rc = sqlite3OsWrite(pPager->fd, zBuf, pPager->pageSize, 0);

        }
        if( rc==SQLITE_OK ){
          pPager->changeCountDone = 1;
        }
      }else{
        pPager->changeCountDone = 1;
      }
................................................................................
  static int a[11];
  a[0] = sqlite3PcacheRefCount(pPager->pPCache);
  a[1] = sqlite3PcachePagecount(pPager->pPCache);
  a[2] = sqlite3PcacheGetCachesize(pPager->pPCache);
  a[3] = pPager->eState==PAGER_OPEN ? -1 : (int) pPager->dbSize;
  a[4] = pPager->eState;
  a[5] = pPager->errCode;
  a[6] = pPager->nHit;
  a[7] = pPager->nMiss;
  a[8] = 0;  /* Used to be pPager->nOvfl */
  a[9] = pPager->nRead;
  a[10] = pPager->nWrite;
  return a;
}
#endif

/*
** Parameter eStat must be either SQLITE_DBSTATUS_CACHE_HIT or
** SQLITE_DBSTATUS_CACHE_MISS. Before returning, *pnVal is incremented by the
** current cache hit or miss count, according to the value of eStat. If the 
** reset parameter is non-zero, the cache hit or miss count is zeroed before 
** returning.
*/
SQLITE_PRIVATE void sqlite3PagerCacheStat(Pager *pPager, int eStat, int reset, int *pnVal){
  int *piStat;

  assert( eStat==SQLITE_DBSTATUS_CACHE_HIT
       || eStat==SQLITE_DBSTATUS_CACHE_MISS

  );
  if( eStat==SQLITE_DBSTATUS_CACHE_HIT ){
    piStat = &pPager->nHit;
  }else{
    piStat = &pPager->nMiss;
  }




  *pnVal += *piStat;
  if( reset ){
    *piStat = 0;
  }
}

/*
** Return true if this is an in-memory pager.
*/
SQLITE_PRIVATE int sqlite3PagerIsMemdb(Pager *pPager){
................................................................................
#define ISAUTOVACUUM 0
#endif


/*
** This structure is passed around through all the sanity checking routines
** in order to keep track of some global state information.






*/
typedef struct IntegrityCk IntegrityCk;
struct IntegrityCk {
  BtShared *pBt;    /* The tree being checked out */
  Pager *pPager;    /* The associated pager.  Also accessible by pBt->pPager */
  int *anRef;       /* Number of times each page is referenced */
  Pgno nPage;       /* Number of pages in the database */
  int mxErr;        /* Stop accumulating errors when this reaches zero */
  int nErr;         /* Number of messages written to zErrMsg so far */
  int mallocFailed; /* A memory allocation error has occurred */
  StrAccum errMsg;  /* Accumulate the error message text here */
};

................................................................................
  /* Assert that the caller has been consistent. If this cursor was opened
  ** expecting an index b-tree, then the caller should be inserting blob
  ** keys with no associated data. If the cursor was opened expecting an
  ** intkey table, the caller should be inserting integer keys with a
  ** blob of associated data.  */
  assert( (pKey==0)==(pCur->pKeyInfo==0) );

  /* If this is an insert into a table b-tree, invalidate any incrblob 
  ** cursors open on the row being replaced (assuming this is a replace
  ** operation - if it is not, the following is a no-op).  */
  if( pCur->pKeyInfo==0 ){
    invalidateIncrblobCursors(p, nKey, 0);
  }

  /* Save the positions of any other cursors open on this table.
  **
  ** In some cases, the call to btreeMoveto() below is a no-op. For
  ** example, when inserting data into a table with auto-generated integer
  ** keys, the VDBE layer invokes sqlite3BtreeLast() to figure out the 
  ** integer key to use. It then calls this function to actually insert the 
  ** data into the intkey B-Tree. In this case btreeMoveto() recognizes
  ** that the cursor is already where it needs to be and returns without
  ** doing any work. To avoid thwarting these optimizations, it is important
  ** not to clear the cursor here.
  */
  rc = saveAllCursors(pBt, pCur->pgnoRoot, pCur);
  if( rc ) return rc;








  if( !loc ){
    rc = btreeMoveto(pCur, pKey, nKey, appendBias, &loc);
    if( rc ) return rc;
  }
  assert( pCur->eState==CURSOR_VALID || (pCur->eState==CURSOR_INVALID && loc) );

  pPage = pCur->apPage[pCur->iPage];
................................................................................

  if( NEVER(pCur->aiIdx[pCur->iPage]>=pCur->apPage[pCur->iPage]->nCell) 
   || NEVER(pCur->eState!=CURSOR_VALID)
  ){
    return SQLITE_ERROR;  /* Something has gone awry. */
  }

  /* If this is a delete operation to remove a row from a table b-tree,
  ** invalidate any incrblob cursors open on the row being deleted.  */
  if( pCur->pKeyInfo==0 ){
    invalidateIncrblobCursors(p, pCur->info.nKey, 0);
  }

  iCellDepth = pCur->iPage;
  iCellIdx = pCur->aiIdx[iCellDepth];
  pPage = pCur->apPage[iCellDepth];
  pCell = findCell(pPage, iCellIdx);

  /* If the page containing the entry to delete is not a leaf page, move
  ** the cursor to the largest entry in the tree that is smaller than
................................................................................
  /* Save the positions of any other cursors open on this table before
  ** making any modifications. Make the page containing the entry to be 
  ** deleted writable. Then free any overflow pages associated with the 
  ** entry and finally remove the cell itself from within the page.  
  */
  rc = saveAllCursors(pBt, pCur->pgnoRoot, pCur);
  if( rc ) return rc;







  rc = sqlite3PagerWrite(pPage->pDbPage);
  if( rc ) return rc;
  rc = clearCell(pPage, pCell);
  dropCell(pPage, iCellIdx, cellSizePtr(pPage, pCell), &rc);
  if( rc ) return rc;

  /* If the cell deleted was not located on a leaf page, then the cursor
................................................................................
*/
SQLITE_PRIVATE int sqlite3BtreeClearTable(Btree *p, int iTable, int *pnChange){
  int rc;
  BtShared *pBt = p->pBt;
  sqlite3BtreeEnter(p);
  assert( p->inTrans==TRANS_WRITE );




  /* Invalidate all incrblob cursors open on table iTable (assuming iTable
  ** is the root of a table b-tree - if it is not, the following call is
  ** a no-op).  */
  invalidateIncrblobCursors(p, 0, 1);

  rc = saveAllCursors(pBt, (Pgno)iTable, 0);
  if( SQLITE_OK==rc ){
    rc = clearDatabasePage(pBt, (Pgno)iTable, 0, pnChange);
  }
  sqlite3BtreeLeave(p);
  return rc;
}

/*
................................................................................
  if( pCheck->errMsg.mallocFailed ){
    pCheck->mallocFailed = 1;
  }
}
#endif /* SQLITE_OMIT_INTEGRITY_CHECK */

#ifndef SQLITE_OMIT_INTEGRITY_CHECK



















/*
** Add 1 to the reference count for page iPage.  If this is the second
** reference to the page, add an error message to pCheck->zErrMsg.
** Return 1 if there are 2 ore more references to the page and 0 if
** if this is the first reference to the page.
**
** Also check that the page number is in bounds.
................................................................................
*/
static int checkRef(IntegrityCk *pCheck, Pgno iPage, char *zContext){
  if( iPage==0 ) return 1;
  if( iPage>pCheck->nPage ){
    checkAppendMsg(pCheck, zContext, "invalid page number %d", iPage);
    return 1;
  }
  if( pCheck->anRef[iPage]==1 ){
    checkAppendMsg(pCheck, zContext, "2nd reference to page %d", iPage);
    return 1;
  }
  return  (pCheck->anRef[iPage]++)>1;

}

#ifndef SQLITE_OMIT_AUTOVACUUM
/*
** Check that the entry in the pointer-map for page iChild maps to 
** page iParent, pointer type ptrType. If not, append an error message
** to pCheck.
................................................................................
  sCheck.nErr = 0;
  sCheck.mallocFailed = 0;
  *pnErr = 0;
  if( sCheck.nPage==0 ){
    sqlite3BtreeLeave(p);
    return 0;
  }
  sCheck.anRef = sqlite3Malloc( (sCheck.nPage+1)*sizeof(sCheck.anRef[0]) );
  if( !sCheck.anRef ){

    *pnErr = 1;
    sqlite3BtreeLeave(p);
    return 0;
  }
  for(i=0; i<=sCheck.nPage; i++){ sCheck.anRef[i] = 0; }
  i = PENDING_BYTE_PAGE(pBt);
  if( i<=sCheck.nPage ){
    sCheck.anRef[i] = 1;
  }
  sqlite3StrAccumInit(&sCheck.errMsg, zErr, sizeof(zErr), 20000);
  sCheck.errMsg.useMalloc = 2;

  /* Check the integrity of the freelist
  */
  checkList(&sCheck, 1, get4byte(&pBt->pPage1->aData[32]),
            get4byte(&pBt->pPage1->aData[36]), "Main freelist: ");
................................................................................
    checkTreePage(&sCheck, aRoot[i], "List of tree roots: ", NULL, NULL);
  }

  /* Make sure every page in the file is referenced
  */
  for(i=1; i<=sCheck.nPage && sCheck.mxErr; i++){
#ifdef SQLITE_OMIT_AUTOVACUUM
    if( sCheck.anRef[i]==0 ){
      checkAppendMsg(&sCheck, 0, "Page %d is never used", i);
    }
#else
    /* If the database supports auto-vacuum, make sure no tables contain
    ** references to pointer-map pages.
    */
    if( sCheck.anRef[i]==0 && 
       (PTRMAP_PAGENO(pBt, i)!=i || !pBt->autoVacuum) ){
      checkAppendMsg(&sCheck, 0, "Page %d is never used", i);
    }
    if( sCheck.anRef[i]!=0 && 
       (PTRMAP_PAGENO(pBt, i)==i && pBt->autoVacuum) ){
      checkAppendMsg(&sCheck, 0, "Pointer map page %d is referenced", i);
    }
#endif
  }

  /* Make sure this analysis did not leave any unref() pages.
................................................................................
      nRef, sqlite3PagerRefcount(pBt->pPager)
    );
  }

  /* Clean  up and report errors.
  */
  sqlite3BtreeLeave(p);
  sqlite3_free(sCheck.anRef);
  if( sCheck.mallocFailed ){
    sqlite3StrAccumReset(&sCheck.errMsg);
    *pnErr = sCheck.nErr+1;
    return 0;
  }
  *pnErr = sCheck.nErr;
  if( sCheck.nErr==0 ) sqlite3StrAccumReset(&sCheck.errMsg);
................................................................................
#endif
}

/*
** Make sure pMem->z points to a writable allocation of at least 
** n bytes.
**
** If the memory cell currently contains string or blob data
** and the third argument passed to this function is true, the 

** current content of the cell is preserved. Otherwise, it may
** be discarded.  
**
** This function sets the MEM_Dyn flag and clears any xDel callback.
** It also clears MEM_Ephem and MEM_Static. If the preserve flag is 
** not set, Mem.n is zeroed.
*/
SQLITE_PRIVATE int sqlite3VdbeMemGrow(Mem *pMem, int n, int preserve){
  assert( 1 >=
    ((pMem->zMalloc && pMem->zMalloc==pMem->z) ? 1 : 0) +
    (((pMem->flags&MEM_Dyn)&&pMem->xDel) ? 1 : 0) + 
    ((pMem->flags&MEM_Ephem) ? 1 : 0) + 
    ((pMem->flags&MEM_Static) ? 1 : 0)
  );
  assert( (pMem->flags&MEM_RowSet)==0 );





  if( n<32 ) n = 32;
  if( sqlite3DbMallocSize(pMem->db, pMem->zMalloc)<n ){
    if( preserve && pMem->z==pMem->zMalloc ){
      pMem->z = pMem->zMalloc = sqlite3DbReallocOrFree(pMem->db, pMem->z, n);
      preserve = 0;
    }else{
................................................................................
      */
      if( pOp->p4type==P4_SUBPROGRAM ){
        int nByte = (nSub+1)*sizeof(SubProgram*);
        int j;
        for(j=0; j<nSub; j++){
          if( apSub[j]==pOp->p4.pProgram ) break;
        }
        if( j==nSub && SQLITE_OK==sqlite3VdbeMemGrow(pSub, nByte, 1) ){
          apSub = (SubProgram **)pSub->z;
          apSub[nSub++] = pOp->p4.pProgram;
          pSub->flags |= MEM_Blob;
          pSub->n = nSub*sizeof(SubProgram*);
        }
      }
    }
................................................................................
** if the P4 argument is a P4_MEM use the value of the P4 argument as
** the result.
**
** If the OPFLAG_CLEARCACHE bit is set on P5 and P1 is a pseudo-table cursor,
** then the cache of the cursor is reset prior to extracting the column.
** The first OP_Column against a pseudo-table after the value of the content
** register has changed should have this bit set.





*/
case OP_Column: {
#if 0  /* local variables moved into u.an */
  u32 payloadSize;   /* Number of bytes in the record */
  i64 payloadSize64; /* Number of bytes in the record */
  int p1;            /* P1 value of the opcode */
  int p2;            /* column number to retrieve */
................................................................................
      if( u.an.payloadSize <= (u32)u.an.avail ){
        u.an.zRec = u.an.zData;
        u.an.pC->aRow = (u8*)u.an.zData;
      }else{
        u.an.pC->aRow = 0;
      }
    }
    /* The following assert is true in all cases accept when
    ** the database file has been corrupted externally.
    **    assert( u.an.zRec!=0 || u.an.avail>=u.an.payloadSize || u.an.avail>=9 ); */
    u.an.szHdr = getVarint32((u8*)u.an.zData, u.an.offset);

    /* Make sure a corrupt database has not given us an oversize header.
    ** Do this now to avoid an oversize memory allocation.
    **
................................................................................
        u.an.szField = sqlite3VdbeSerialTypeLen(u.an.t);
        u.an.offset += u.an.szField;
        if( u.an.offset<u.an.szField ){  /* True if u.an.offset overflows */
          u.an.zIdx = &u.an.zEndHdr[1];  /* Forces SQLITE_CORRUPT return below */
          break;
        }
      }else{
        /* If u.an.i is less that u.an.nField, then there are less fields in this
        ** record than SetNumColumns indicated there are columns in the
        ** table. Set the u.an.offset for any extra columns not present in
        ** the record to 0. This tells code below to store a NULL
        ** instead of deserializing a value from the record.
        */
        u.an.aOffset[u.an.i] = 0;
      }
    }
    sqlite3VdbeMemRelease(&u.an.sMem);
    u.an.sMem.flags = MEM_Null;

................................................................................
  ** then there are not enough fields in the record to satisfy the
  ** request.  In this case, set the value NULL or to P4 if P4 is
  ** a pointer to a Mem object.
  */
  if( u.an.aOffset[u.an.p2] ){
    assert( rc==SQLITE_OK );
    if( u.an.zRec ){

      VdbeMemRelease(u.an.pDest);
      sqlite3VdbeSerialGet((u8 *)&u.an.zRec[u.an.aOffset[u.an.p2]], u.an.aType[u.an.p2], u.an.pDest);
    }else{












      u.an.len = sqlite3VdbeSerialTypeLen(u.an.aType[u.an.p2]);
      sqlite3VdbeMemMove(&u.an.sMem, u.an.pDest);
      rc = sqlite3VdbeMemFromBtree(u.an.pCrsr, u.an.aOffset[u.an.p2], u.an.len, u.an.pC->isIndex, &u.an.sMem);

      if( rc!=SQLITE_OK ){
        goto op_column_out;
      }
      u.an.zData = u.an.sMem.z;

      sqlite3VdbeSerialGet((u8*)u.an.zData, u.an.aType[u.an.p2], u.an.pDest);
    }
    u.an.pDest->enc = encoding;
  }else{
    if( pOp->p4type==P4_MEM ){
      sqlite3VdbeMemShallowCopy(u.an.pDest, pOp->p4.pMem, MEM_Static);
    }else{
      MemSetTypeFlag(u.an.pDest, MEM_Null);
................................................................................
          p->rc = rc = SQLITE_BUSY;
          goto vdbe_return;
        }
        db->isTransactionSavepoint = 0;
        rc = p->rc;
      }else{
        u.ar.iSavepoint = db->nSavepoint - u.ar.iSavepoint - 1;

        for(u.ar.ii=0; u.ar.ii<db->nDb; u.ar.ii++){
          sqlite3BtreeTripAllCursors(db->aDb[u.ar.ii].pBt, SQLITE_ABORT);

        }
        for(u.ar.ii=0; u.ar.ii<db->nDb; u.ar.ii++){
          rc = sqlite3BtreeSavepoint(db->aDb[u.ar.ii].pBt, u.ar.p1, u.ar.iSavepoint);
          if( rc!=SQLITE_OK ){
            goto abort_due_to_error;
          }
        }
................................................................................

      testcase( pExpr->op==TK_CONST_FUNC );
      assert( !ExprHasProperty(pExpr, EP_xIsSelect) );
      zId = pExpr->u.zToken;
      nId = sqlite3Strlen30(zId);
      pDef = sqlite3FindFunction(pParse->db, zId, nId, n, enc, 0);
      if( pDef==0 ){
        pDef = sqlite3FindFunction(pParse->db, zId, nId, -1, enc, 0);
        if( pDef==0 ){
          no_such_func = 1;
        }else{
          wrong_num_args = 1;
        }
      }else{
        is_agg = pDef->xFunc==0;
................................................................................
*/
static int resolveOrderGroupBy(
  NameContext *pNC,     /* The name context of the SELECT statement */
  Select *pSelect,      /* The SELECT statement holding pOrderBy */
  ExprList *pOrderBy,   /* An ORDER BY or GROUP BY clause to resolve */
  const char *zType     /* Either "ORDER" or "GROUP", as appropriate */
){
  int i;                         /* Loop counter */
  int iCol;                      /* Column number */
  struct ExprList_item *pItem;   /* A term of the ORDER BY clause */
  Parse *pParse;                 /* Parsing context */
  int nResult;                   /* Number of terms in the result set */

  if( pOrderBy==0 ) return 0;
  nResult = pSelect->pEList->nExpr;
................................................................................
      continue;
    }

    /* Otherwise, treat the ORDER BY term as an ordinary expression */
    pItem->iOrderByCol = 0;
    if( sqlite3ResolveExprNames(pNC, pE) ){
      return 1;





    }
  }
  return sqlite3ResolveOrderGroupBy(pParse, pSelect, pOrderBy, zType);
}

/*
** Resolve names in the SELECT statement p and all of its descendents.
................................................................................
SQLITE_PRIVATE Expr *sqlite3PExpr(
  Parse *pParse,          /* Parsing context */
  int op,                 /* Expression opcode */
  Expr *pLeft,            /* Left operand */
  Expr *pRight,           /* Right operand */
  const Token *pToken     /* Argument token */
){





  Expr *p = sqlite3ExprAlloc(pParse->db, op, pToken, 1);
  sqlite3ExprAttachSubtrees(pParse->db, p, pLeft, pRight);

  if( p ) {
    sqlite3ExprCheckHeight(pParse, p->nHeight);
  }
  return p;
}



















/*
** Join two expressions using an AND operator.  If either expression is
** NULL, then just return the other expression.




*/
SQLITE_PRIVATE Expr *sqlite3ExprAnd(sqlite3 *db, Expr *pLeft, Expr *pRight){
  if( pLeft==0 ){
    return pRight;
  }else if( pRight==0 ){
    return pLeft;




  }else{
    Expr *pNew = sqlite3ExprAlloc(db, TK_AND, 0, 0);
    sqlite3ExprAttachSubtrees(db, pNew, pLeft, pRight);
    return pNew;
  }
}

................................................................................
  /* First replace any existing entry.
  **
  ** Actually, the way the column cache is currently used, we are guaranteed
  ** that the object will never already be in cache.  Verify this guarantee.
  */
#ifndef NDEBUG
  for(i=0, p=pParse->aColCache; i<SQLITE_N_COLCACHE; i++, p++){
#if 0 /* This code wold remove the entry from the cache if it existed */
    if( p->iReg && p->iTable==iTab && p->iColumn==iCol ){
      cacheEntryClear(pParse, p);
      p->iLevel = pParse->iCacheLevel;
      p->iReg = iReg;
      p->lru = pParse->iCacheCnt++;
      return;
    }
#endif
    assert( p->iReg==0 || p->iTable!=iTab || p->iColumn!=iCol );
  }
#endif

  /* Find an empty slot and replace it */
  for(i=0, p=pParse->aColCache; i<SQLITE_N_COLCACHE; i++, p++){
    if( p->iReg==0 ){
................................................................................
** is called.  If iColumn<0 then code is generated that extracts the rowid.
*/
SQLITE_PRIVATE int sqlite3ExprCodeGetColumn(
  Parse *pParse,   /* Parsing and code generating context */
  Table *pTab,     /* Description of the table we are reading from */
  int iColumn,     /* Index of the table column */
  int iTable,      /* The cursor pointing to the table */
  int iReg         /* Store results here */

){
  Vdbe *v = pParse->pVdbe;
  int i;
  struct yColCache *p;

  for(i=0, p=pParse->aColCache; i<SQLITE_N_COLCACHE; i++, p++){
    if( p->iReg>0 && p->iTable==iTable && p->iColumn==iColumn ){
................................................................................
      p->lru = pParse->iCacheCnt++;
      sqlite3ExprCachePinRegister(pParse, p->iReg);
      return p->iReg;
    }
  }  
  assert( v!=0 );
  sqlite3ExprCodeGetColumnOfTable(v, pTab, iTable, iColumn, iReg);



  sqlite3ExprCacheStore(pParse, iTable, iColumn, iReg);

  return iReg;
}

/*
** Clear all column cache entries.
*/
SQLITE_PRIVATE void sqlite3ExprCacheClear(Parse *pParse){
................................................................................
    case TK_COLUMN: {
      if( pExpr->iTable<0 ){
        /* This only happens when coding check constraints */
        assert( pParse->ckBase>0 );
        inReg = pExpr->iColumn + pParse->ckBase;
      }else{
        inReg = sqlite3ExprCodeGetColumn(pParse, pExpr->pTab,
                                 pExpr->iColumn, pExpr->iTable, target);

      }
      break;
    }
    case TK_INTEGER: {
      codeInteger(pParse, pExpr, 0, target);
      break;
    }
................................................................................
        sqlite3VdbeResolveLabel(v, endCoalesce);
        break;
      }


      if( pFarg ){
        r1 = sqlite3GetTempRange(pParse, nFarg);



















        sqlite3ExprCachePush(pParse);     /* Ticket 2ea2425d34be */
        sqlite3ExprCodeExprList(pParse, pFarg, r1, 1);
        sqlite3ExprCachePop(pParse, 1);   /* Ticket 2ea2425d34be */
      }else{
        r1 = 0;
      }
#ifndef SQLITE_OMIT_VIRTUALTABLE
................................................................................
  if( sqlite3ExprCompare(pA->pRight, pB->pRight) ) return 2;
  if( sqlite3ExprListCompare(pA->x.pList, pB->x.pList) ) return 2;
  if( pA->iTable!=pB->iTable || pA->iColumn!=pB->iColumn ) return 2;
  if( ExprHasProperty(pA, EP_IntValue) ){
    if( !ExprHasProperty(pB, EP_IntValue) || pA->u.iValue!=pB->u.iValue ){
      return 2;
    }
  }else if( pA->op!=TK_COLUMN && pA->u.zToken ){
    if( ExprHasProperty(pB, EP_IntValue) || NEVER(pB->u.zToken==0) ) return 2;
    if( strcmp(pA->u.zToken,pB->u.zToken)!=0 ){
      return 2;
    }
  }
  if( (pA->flags & EP_ExpCollate)!=(pB->flags & EP_ExpCollate) ) return 1;
  if( (pA->flags & EP_ExpCollate)!=0 && pA->pColl!=pB->pColl ) return 2;
................................................................................
    Expr *pExprA = pA->a[i].pExpr;
    Expr *pExprB = pB->a[i].pExpr;
    if( pA->a[i].sortOrder!=pB->a[i].sortOrder ) return 1;
    if( sqlite3ExprCompare(pExprA, pExprB) ) return 1;
  }
  return 0;
}




































/*
** Add a new element to the pAggInfo->aCol[] array.  Return the index of
** the new element.  Return a negative number if malloc fails.
*/
static int addAggInfoColumn(sqlite3 *db, AggInfo *pInfo){
  int i;
................................................................................
            break;
          } /* endif pExpr->iTable==pItem->iCursor */
        } /* end loop over pSrcList */
      }
      return WRC_Prune;
    }
    case TK_AGG_FUNCTION: {
      /* The pNC->nDepth==0 test causes aggregate functions in subqueries
      ** to be ignored */
      if( pNC->nDepth==0 ){
        /* Check to see if pExpr is a duplicate of another aggregate 
        ** function that is already in the pAggInfo structure
        */
        struct AggInfo_func *pItem = pAggInfo->aFunc;
        for(i=0; i<pAggInfo->nFunc; i++, pItem++){
          if( sqlite3ExprCompare(pItem->pExpr, pExpr)==0 ){
            break;
................................................................................
        return WRC_Prune;
      }
    }
  }
  return WRC_Continue;
}
static int analyzeAggregatesInSelect(Walker *pWalker, Select *pSelect){
  NameContext *pNC = pWalker->u.pNC;
  if( pNC->nDepth==0 ){
    pNC->nDepth++;
    sqlite3WalkSelect(pWalker, pSelect);
    pNC->nDepth--;
    return WRC_Prune;
  }else{
    return WRC_Continue;
  }
}

/*
** Analyze the given expression looking for aggregate functions and
** for variables that need to be added to the pParse->aAgg[] array.
** Make additional entries to the pParse->aAgg[] array as necessary.
**
** This routine should only be called after the expression has been
** analyzed by sqlite3ResolveExprNames().
*/
SQLITE_PRIVATE void sqlite3ExprAnalyzeAggregates(NameContext *pNC, Expr *pExpr){
  Walker w;

  w.xExprCallback = analyzeAggregate;
  w.xSelectCallback = analyzeAggregatesInSelect;
  w.u.pNC = pNC;
  assert( pNC->pSrcList!=0 );
  sqlite3WalkExpr(&w, pExpr);
}

................................................................................
  /* Delete the Table structure itself.
  */
  sqliteDeleteColumnNames(db, pTable);
  sqlite3DbFree(db, pTable->zName);
  sqlite3DbFree(db, pTable->zColAff);
  sqlite3SelectDelete(db, pTable->pSelect);
#ifndef SQLITE_OMIT_CHECK
  sqlite3ExprDelete(db, pTable->pCheck);
#endif
#ifndef SQLITE_OMIT_VIRTUALTABLE
  sqlite3VtabClear(db, pTable);
#endif
  sqlite3DbFree(db, pTable);
}

................................................................................
/*
** Add a new CHECK constraint to the table currently under construction.
*/
SQLITE_PRIVATE void sqlite3AddCheckConstraint(
  Parse *pParse,    /* Parsing context */
  Expr *pCheckExpr  /* The check expression */
){
  sqlite3 *db = pParse->db;
#ifndef SQLITE_OMIT_CHECK
  Table *pTab = pParse->pNewTable;
  if( pTab && !IN_DECLARE_VTAB ){
    pTab->pCheck = sqlite3ExprAnd(db, pTab->pCheck, pCheckExpr);



  }else
#endif
  {
    sqlite3ExprDelete(db, pCheckExpr);
  }
}

/*
** Set the collation function of the most recently parsed table column
** to the CollSeq given.
*/
................................................................................

#ifndef SQLITE_OMIT_CHECK
  /* Resolve names in all CHECK constraint expressions.
  */
  if( p->pCheck ){
    SrcList sSrc;                   /* Fake SrcList for pParse->pNewTable */
    NameContext sNC;                /* Name context for pParse->pNewTable */



    memset(&sNC, 0, sizeof(sNC));
    memset(&sSrc, 0, sizeof(sSrc));
    sSrc.nSrc = 1;
    sSrc.a[0].zName = p->zName;
    sSrc.a[0].pTab = p;
    sSrc.a[0].iCursor = -1;
    sNC.pParse = pParse;
    sNC.pSrcList = &sSrc;
    sNC.isCheck = 1;


    if( sqlite3ResolveExprNames(&sNC, p->pCheck) ){
      return;

    }
  }
#endif /* !defined(SQLITE_OMIT_CHECK) */

  /* If the db->init.busy is 1 it means we are reading the SQL off the
  ** "sqlite_master" or "sqlite_temp_master" table on the disk.
  ** So do not write to the disk again.  Extract the root page number
................................................................................
  }

exit_drop_index:
  sqlite3SrcListDelete(db, pName);
}

/*
** pArray is a pointer to an array of objects.  Each object in the
** array is szEntry bytes in size.  This routine allocates a new
** object on the end of the array.
**
** *pnEntry is the number of entries already in use.  *pnAlloc is
** the previously allocated size of the array.  initSize is the
** suggested initial array size allocation.
**
** The index of the new entry is returned in *pIdx.



**
** This routine returns a pointer to the array of objects.  This
** might be the same as the pArray parameter or it might be a different
** pointer if the array was resized.


*/
SQLITE_PRIVATE void *sqlite3ArrayAllocate(
  sqlite3 *db,      /* Connection to notify of malloc failures */
  void *pArray,     /* Array of objects.  Might be reallocated */
  int szEntry,      /* Size of each object in the array */
  int *pnEntry,     /* Number of objects currently in use */
  int *pIdx         /* Write the index of a new slot here */
................................................................................
}

/* During the search for the best function definition, this procedure
** is called to test how well the function passed as the first argument
** matches the request for a function with nArg arguments in a system
** that uses encoding enc. The value returned indicates how well the
** request is matched. A higher value indicates a better match.
**
** The returned value is always between 0 and 6, as follows:
**
** 0: Not a match, or if nArg<0 and the function is has no implementation.
** 1: A variable arguments function that prefers UTF-8 when a UTF-16
**    encoding is requested, or vice versa.
** 2: A variable arguments function that uses UTF-16BE when UTF-16LE is
**    requested, or vice versa.
** 3: A variable arguments function using the same text encoding.
** 4: A function with the exact number of arguments requested that
**    prefers UTF-8 when a UTF-16 encoding is requested, or vice versa.
** 5: A function with the exact number of arguments requested that
**    prefers UTF-16LE when UTF-16BE is requested, or vice versa.
** 6: An exact match.
**
*/
static int matchQuality(FuncDef *p, int nArg, u8 enc){
  int match = 0;
  if( p->nArg==-1 || p->nArg==nArg 
   || (nArg==-1 && (p->xFunc!=0 || p->xStep!=0))
  ){
    match = 1;
    if( p->nArg==nArg || nArg==-1 ){
      match = 4;
    }
    if( enc==p->iPrefEnc ){
      match += 2;
    }
    else if( (enc==SQLITE_UTF16LE && p->iPrefEnc==SQLITE_UTF16BE) ||
             (enc==SQLITE_UTF16BE && p->iPrefEnc==SQLITE_UTF16LE) ){
      match += 1;
    }
  }



















  return match;
}

/*
** Search a FuncDefHash for a function with the given name.  Return
** a pointer to the matching FuncDef if found, or 0 if there is no match.
*/
................................................................................
** Locate a user function given a name, a number of arguments and a flag
** indicating whether the function prefers UTF-16 over UTF-8.  Return a
** pointer to the FuncDef structure that defines that function, or return
** NULL if the function does not exist.
**
** If the createFlag argument is true, then a new (blank) FuncDef
** structure is created and liked into the "db" structure if a
** no matching function previously existed.  When createFlag is true
** and the nArg parameter is -1, then only a function that accepts
** any number of arguments will be returned.
**
** If createFlag is false and nArg is -1, then the first valid
** function found is returned.  A function is valid if either xFunc
** or xStep is non-zero.
**
** If createFlag is false, then a function with the required name and
** number of arguments may be returned even if the eTextRep flag does not
** match that requested.
*/
SQLITE_PRIVATE FuncDef *sqlite3FindFunction(
  sqlite3 *db,       /* An open database */
  const char *zName, /* Name of the function.  Not null-terminated */
  int nName,         /* Number of characters in the name */
  int nArg,          /* Number of arguments.  -1 means any number */
  u8 enc,            /* Preferred text encoding */
  int createFlag     /* Create new entry if true and does not otherwise exist */
){
  FuncDef *p;         /* Iterator variable */
  FuncDef *pBest = 0; /* Best match found so far */
  int bestScore = 0;  /* Score of best match */
  int h;              /* Hash value */



  assert( enc==SQLITE_UTF8 || enc==SQLITE_UTF16LE || enc==SQLITE_UTF16BE );
  h = (sqlite3UpperToLower[(u8)zName[0]] + nName) % ArraySize(db->aFunc.a);

  /* First search for a match amongst the application-defined functions.
  */
  p = functionSearch(&db->aFunc, h, zName, nName);
  while( p ){
................................................................................
    }
  }

  /* If the createFlag parameter is true and the search did not reveal an
  ** exact match for the name, number of arguments and encoding, then add a
  ** new entry to the hash table and return it.
  */
  if( createFlag && (bestScore<6 || pBest->nArg!=nArg) && 
      (pBest = sqlite3DbMallocZero(db, sizeof(*pBest)+nName+1))!=0 ){
    pBest->zName = (char *)&pBest[1];
    pBest->nArg = (u16)nArg;
    pBest->iPrefEnc = enc;
    memcpy(pBest->zName, zName, nName);
    pBest->zName[nName] = 0;
    sqlite3FuncDefInsert(&db->aFunc, pBest);
................................................................................
    /* Collect rowids of every row to be deleted.
    */
    sqlite3VdbeAddOp2(v, OP_Null, 0, iRowSet);
    pWInfo = sqlite3WhereBegin(
        pParse, pTabList, pWhere, 0, 0, WHERE_DUPLICATES_OK
    );
    if( pWInfo==0 ) goto delete_from_cleanup;
    regRowid = sqlite3ExprCodeGetColumn(pParse, pTab, -1, iCur, iRowid);
    sqlite3VdbeAddOp2(v, OP_RowSetAdd, iRowSet, regRowid);
    if( db->flags & SQLITE_CountRows ){
      sqlite3VdbeAddOp2(v, OP_AddImm, memCnt, 1);
    }
    sqlite3WhereEnd(pWInfo);

    /* Delete every item whose key was written to the list during the
................................................................................
    FUNCTION(trim,               2, 3, 0, trimFunc         ),
    FUNCTION(min,               -1, 0, 1, minmaxFunc       ),
    FUNCTION(min,                0, 0, 1, 0                ),
    AGGREGATE(min,               1, 0, 1, minmaxStep,      minMaxFinalize ),
    FUNCTION(max,               -1, 1, 1, minmaxFunc       ),
    FUNCTION(max,                0, 1, 1, 0                ),
    AGGREGATE(max,               1, 1, 1, minmaxStep,      minMaxFinalize ),
    FUNCTION(typeof,             1, 0, 0, typeofFunc       ),
    FUNCTION(length,             1, 0, 0, lengthFunc       ),
    FUNCTION(substr,             2, 0, 0, substrFunc       ),
    FUNCTION(substr,             3, 0, 0, substrFunc       ),
    FUNCTION(abs,                1, 0, 0, absFunc          ),
#ifndef SQLITE_OMIT_FLOATING_POINT
    FUNCTION(round,              1, 0, 0, roundFunc        ),
    FUNCTION(round,              2, 0, 0, roundFunc        ),
#endif
    FUNCTION(upper,              1, 0, 0, upperFunc        ),
    FUNCTION(lower,              1, 0, 0, lowerFunc        ),
    FUNCTION(coalesce,           1, 0, 0, 0                ),
    FUNCTION(coalesce,           0, 0, 0, 0                ),
/*  FUNCTION(coalesce,          -1, 0, 0, ifnullFunc       ), */
    {-1,SQLITE_UTF8,SQLITE_FUNC_COALESCE,0,0,ifnullFunc,0,0,"coalesce",0,0},
    FUNCTION(hex,                1, 0, 0, hexFunc          ),
/*  FUNCTION(ifnull,             2, 0, 0, ifnullFunc       ), */
    {2,SQLITE_UTF8,SQLITE_FUNC_COALESCE,0,0,ifnullFunc,0,0,"ifnull",0,0},
    FUNCTION(random,             0, 0, 0, randomFunc       ),
    FUNCTION(randomblob,         1, 0, 0, randomBlob       ),
    FUNCTION(nullif,             2, 0, 1, nullifFunc       ),
    FUNCTION(sqlite_version,     0, 0, 0, versionFunc      ),
    FUNCTION(sqlite_source_id,   0, 0, 0, sourceidFunc     ),
    FUNCTION(sqlite_log,         2, 0, 0, errlogFunc       ),
#ifndef SQLITE_OMIT_COMPILEOPTION_DIAGS
................................................................................
  int nCol;           /* Number of columns */
  int onError;        /* Conflict resolution strategy */
  int j1;             /* Addresss of jump instruction */
  int j2 = 0, j3;     /* Addresses of jump instructions */
  int regData;        /* Register containing first data column */
  int iCur;           /* Table cursor number */
  Index *pIdx;         /* Pointer to one of the indices */

  int seenReplace = 0; /* True if REPLACE is used to resolve INT PK conflict */
  int regOldRowid = (rowidChng && isUpdate) ? rowidChng : regRowid;


  v = sqlite3GetVdbe(pParse);
  assert( v!=0 );
  assert( pTab->pSelect==0 );  /* This table is not a VIEW */
  nCol = pTab->nCol;
  regData = regRowid + 1;

  /* Test all NOT NULL constraints.
................................................................................
      case OE_Abort:
        sqlite3MayAbort(pParse);
      case OE_Rollback:
      case OE_Fail: {
        char *zMsg;
        sqlite3VdbeAddOp3(v, OP_HaltIfNull,
                                  SQLITE_CONSTRAINT, onError, regData+i);
        zMsg = sqlite3MPrintf(pParse->db, "%s.%s may not be NULL",
                              pTab->zName, pTab->aCol[i].zName);
        sqlite3VdbeChangeP4(v, -1, zMsg, P4_DYNAMIC);
        break;
      }
      case OE_Ignore: {
        sqlite3VdbeAddOp2(v, OP_IsNull, regData+i, ignoreDest);
        break;
................................................................................
      }
    }
  }

  /* Test all CHECK constraints
  */
#ifndef SQLITE_OMIT_CHECK
  if( pTab->pCheck && (pParse->db->flags & SQLITE_IgnoreChecks)==0 ){
    int allOk = sqlite3VdbeMakeLabel(v);
    pParse->ckBase = regData;
    sqlite3ExprIfTrue(pParse, pTab->pCheck, allOk, SQLITE_JUMPIFNULL);
    onError = overrideError!=OE_Default ? overrideError : OE_Abort;



    if( onError==OE_Ignore ){
      sqlite3VdbeAddOp2(v, OP_Goto, 0, ignoreDest);
    }else{

      if( onError==OE_Replace ) onError = OE_Abort; /* IMP: R-15569-63625 */





      sqlite3HaltConstraint(pParse, onError, 0, 0);
    }
    sqlite3VdbeResolveLabel(v, allOk);

  }
#endif /* !defined(SQLITE_OMIT_CHECK) */

  /* If we have an INTEGER PRIMARY KEY, make sure the primary key
  ** of the new record does not previously exist.  Except, if this
  ** is an UPDATE and the primary key is not changing, that is OK.
  */
................................................................................
        **
        **   REPLACE INTO t(rowid) VALUES($newrowid)
        **
        ** to run without a statement journal if there are no indexes on the
        ** table.
        */
        Trigger *pTrigger = 0;
        if( pParse->db->flags&SQLITE_RecTriggers ){
          pTrigger = sqlite3TriggersExist(pParse, pTab, TK_DELETE, 0, 0);
        }
        if( pTrigger || sqlite3FkRequired(pParse, pTab, 0, 0) ){
          sqlite3MultiWrite(pParse);
          sqlite3GenerateRowDelete(
              pParse, pTab, baseCur, regRowid, 0, pTrigger, OE_Replace
          );
................................................................................
      case OE_Fail: {
        int j;
        StrAccum errMsg;
        const char *zSep;
        char *zErr;

        sqlite3StrAccumInit(&errMsg, 0, 0, 200);
        errMsg.db = pParse->db;
        zSep = pIdx->nColumn>1 ? "columns " : "column ";
        for(j=0; j<pIdx->nColumn; j++){
          char *zCol = pTab->aCol[pIdx->aiColumn[j]].zName;
          sqlite3StrAccumAppend(&errMsg, zSep, -1);
          zSep = ", ";
          sqlite3StrAccumAppend(&errMsg, zCol, -1);
        }
................................................................................
        sqlite3VdbeAddOp2(v, OP_Goto, 0, ignoreDest);
        break;
      }
      default: {
        Trigger *pTrigger = 0;
        assert( onError==OE_Replace );
        sqlite3MultiWrite(pParse);
        if( pParse->db->flags&SQLITE_RecTriggers ){
          pTrigger = sqlite3TriggersExist(pParse, pTab, TK_DELETE, 0, 0);
        }
        sqlite3GenerateRowDelete(
            pParse, pTab, baseCur, regR, 0, pTrigger, OE_Replace
        );
        seenReplace = 1;
        break;
................................................................................
      if( xferCompatibleIndex(pDestIdx, pSrcIdx) ) break;
    }
    if( pSrcIdx==0 ){
      return 0;    /* pDestIdx has no corresponding index in pSrc */
    }
  }
#ifndef SQLITE_OMIT_CHECK
  if( pDest->pCheck && sqlite3ExprCompare(pSrc->pCheck, pDest->pCheck) ){
    return 0;   /* Tables have different CHECK constraints.  Ticket #2252 */
  }
#endif
#ifndef SQLITE_OMIT_FOREIGN_KEY
  /* Disallow the transfer optimization if the destination table constains
  ** any foreign key constraints.  This is more restrictive than necessary.
  ** But the main beneficiary of the transfer optimization is the VACUUM 
................................................................................
  int cnt;                    /* Index added to make the name unique */
  Column *aCol, *pCol;        /* For looping over result columns */
  int nCol;                   /* Number of columns in the result set */
  Expr *p;                    /* Expression for a single result column */
  char *zName;                /* Column name */
  int nName;                  /* Size of name in zName[] */


  *pnCol = nCol = pEList ? pEList->nExpr : 0;
  aCol = *paCol = sqlite3DbMallocZero(db, sizeof(aCol[0])*nCol);
  if( aCol==0 ) return SQLITE_NOMEM;







  for(i=0, pCol=aCol; i<nCol; i++, pCol++){
    /* Get an appropriate name for the column
    */
    p = pEList->a[i].pExpr;
    assert( p->pRight==0 || ExprHasProperty(p->pRight, EP_IntValue)
               || p->pRight->u.zToken==0 || p->pRight->u.zToken[0]!=0 );
    if( (zName = pEList->a[i].zName)!=0 ){
................................................................................
    }
  }

  /***** If we reach this point, flattening is permitted. *****/

  /* Authorize the subquery */
  pParse->zAuthContext = pSubitem->zName;
  sqlite3AuthCheck(pParse, SQLITE_SELECT, 0, 0, 0);

  pParse->zAuthContext = zSavedAuthContext;

  /* If the sub-query is a compound SELECT statement, then (by restrictions
  ** 17 and 18 above) it must be a UNION ALL and the parent query must 
  ** be of the form:
  **
  **     SELECT <expr-list> FROM (<sub-query>) <where-clause> 
................................................................................
        for(i=0; i<sAggInfo.nColumn; i++){
          struct AggInfo_col *pCol = &sAggInfo.aCol[i];
          if( pCol->iSorterColumn>=j ){
            int r1 = j + regBase;
            int r2;

            r2 = sqlite3ExprCodeGetColumn(pParse, 
                               pCol->pTab, pCol->iColumn, pCol->iTable, r1);
            if( r1!=r2 ){
              sqlite3VdbeAddOp2(v, OP_SCopy, r2, r1);
            }
            j++;
          }
        }
        regRecord = sqlite3GetTempReg(pParse);
................................................................................
static int vtabCallConstructor(
  sqlite3 *db, 
  Table *pTab,
  Module *pMod,
  int (*xConstruct)(sqlite3*,void*,int,const char*const*,sqlite3_vtab**,char**),
  char **pzErr
){
  VtabCtx sCtx;
  VTable *pVTable;
  int rc;
  const char *const*azArg = (const char *const*)pTab->azModuleArg;
  int nArg = pTab->nModuleArg;
  char *zErr = 0;
  char *zModuleName = sqlite3MPrintf(db, "%s", pTab->zName);

................................................................................
  pVTable->pMod = pMod;

  /* Invoke the virtual table constructor */
  assert( &db->pVtabCtx );
  assert( xConstruct );
  sCtx.pTab = pTab;
  sCtx.pVTable = pVTable;

  db->pVtabCtx = &sCtx;
  rc = xConstruct(db, pMod->pAux, nArg, azArg, &pVTable->pVtab, &zErr);
  db->pVtabCtx = 0;
  if( rc==SQLITE_NOMEM ) db->mallocFailed = 1;

  if( SQLITE_OK!=rc ){
    if( zErr==0 ){
      *pzErr = sqlite3MPrintf(db, "vtable constructor failed: %s", zModuleName);
    }else {
      *pzErr = sqlite3MPrintf(db, "%s", zErr);
................................................................................
    return 0;
  }
#ifdef SQLITE_EBCDIC
  if( *pnoCase ) return 0;
#endif
  pList = pExpr->x.pList;
  pLeft = pList->a[1].pExpr;

  if( pLeft->op!=TK_COLUMN || sqlite3ExprAffinity(pLeft)!=SQLITE_AFF_TEXT ){


    /* IMP: R-02065-49465 The left-hand side of the LIKE or GLOB operator must
    ** be the name of an indexed column with TEXT affinity. */
    return 0;
  }
  assert( pLeft->iColumn!=(-1) ); /* Because IPK never has AFF_TEXT */

  pRight = pList->a[0].pExpr;
................................................................................
  **
  **   1. The index is itself UNIQUE, and
  **
  **   2. All of the columns in the index are either part of the pDistinct
  **      list, or else the WHERE clause contains a term of the form "col=X",
  **      where X is a constant value. The collation sequences of the
  **      comparison and select-list expressions must match those of the index.



  */
  for(pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext){
    if( pIdx->onError==OE_None ) continue;
    for(i=0; i<pIdx->nColumn; i++){
      int iCol = pIdx->aiColumn[i];
      if( 0==findTerm(pWC, iBase, iCol, ~(Bitmask)0, WO_EQ, pIdx) 
       && 0>findIndexCol(pParse, pDistinct, iBase, pIdx, i)
      ){
        break;

      }
    }
    if( i==pIdx->nColumn ){
      /* This index implies that the DISTINCT qualifier is redundant. */
      return 1;
    }
  }
................................................................................
  if( j>=nTerm ){
    /* All terms of the ORDER BY clause are covered by this index so
    ** this index can be used for sorting. */
    return 1;
  }
  if( pIdx->onError!=OE_None && i==pIdx->nColumn
      && (wsFlags & WHERE_COLUMN_NULL)==0
      && !referencesOtherTables(pOrderBy, pMaskSet, j, base) ){



    /* All terms of this index match some prefix of the ORDER BY clause
    ** and the index is UNIQUE and no terms on the tail of the ORDER BY
    ** clause reference other tables in a join.  If this is all true then
    ** the order by clause is superfluous.  Not that if the matching
    ** condition is IS NULL then the result is not necessarily unique
    ** even on a UNIQUE index, so disallow those cases. */











    return 1;
  }
  return 0;
}

/*
** Prepare a crude estimate of the logarithm of the input value.
** The results need not be exact.  This is only used for estimating
................................................................................
          explainOneScan(
              pParse, pOrTab, &pSubWInfo->a[0], iLevel, pLevel->iFrom, 0
          );
          if( (wctrlFlags & WHERE_DUPLICATES_OK)==0 ){
            int iSet = ((ii==pOrWc->nTerm-1)?-1:ii);
            int r;
            r = sqlite3ExprCodeGetColumn(pParse, pTabItem->pTab, -1, iCur, 
                                         regRowid);
            sqlite3VdbeAddOp4Int(v, OP_RowSetTest, regRowset,
                                 sqlite3VdbeCurrentAddr(v)+2, r, iSet);
          }
          sqlite3VdbeAddOp2(v, OP_Gosub, regReturn, iLoopBody);

          /* The pSubWInfo->untestedTerms flag means that this OR term
          ** contained one or more AND term from a notReady table.  The
................................................................................

/*
** An instance of this structure is used to store the LIKE,
** GLOB, NOT LIKE, and NOT GLOB operators.
*/
struct LikeOp {
  Token eOperator;  /* "like" or "glob" or "regexp" */
  int not;         /* True if the NOT keyword is present */
};

/*
** An instance of the following structure describes the event of a
** TRIGGER.  "a" is the event type, one of TK_UPDATE, TK_INSERT,
** TK_DELETE, or TK_INSTEAD.  If the event is of the form
**
................................................................................
#ifndef YYSTACKDEPTH
#define YYSTACKDEPTH 100
#endif
#define sqlite3ParserARG_SDECL Parse *pParse;
#define sqlite3ParserARG_PDECL ,Parse *pParse
#define sqlite3ParserARG_FETCH Parse *pParse = yypParser->pParse
#define sqlite3ParserARG_STORE yypParser->pParse = pParse
#define YYNSTATE 629
#define YYNRULE 327
#define YYFALLBACK 1
#define YY_NO_ACTION      (YYNSTATE+YYNRULE+2)
#define YY_ACCEPT_ACTION  (YYNSTATE+YYNRULE+1)
#define YY_ERROR_ACTION   (YYNSTATE+YYNRULE)

/* The yyzerominor constant is used to initialize instances of
................................................................................
**                     yy_action.  Used to detect hash collisions.
**  yy_shift_ofst[]    For each state, the offset into yy_action for
**                     shifting terminals.
**  yy_reduce_ofst[]   For each state, the offset into yy_action for
**                     shifting non-terminals after a reduce.
**  yy_default[]       Default action for each state.
*/
#define YY_ACTTAB_COUNT (1580)
static const YYACTIONTYPE yy_action[] = {
 /*     0 */   310,  328,  574,  573,   15,  172,  187,  596,   56,   56,
 /*    10 */    56,   56,   49,   54,   54,   54,   54,   53,   53,   52,
 /*    20 */    52,   52,   51,  234,  622,  621,  626,  622,  621,  299,
 /*    30 */   589,  583,   56,   56,   56,   56,  236,   54,   54,   54,
 /*    40 */    54,   53,   53,   52,   52,   52,   51,  234,  351,   57,
 /*    50 */    58,   48,  581,  580,  582,  582,   55,   55,   56,   56,
 /*    60 */    56,   56,  570,   54,   54,   54,   54,   53,   53,   52,
 /*    70 */    52,   52,   51,  234,  310,  596,  326,  607,  233,  232,
 /*    80 */    33,   54,   54,   54,   54,   53,   53,   52,   52,   52,
 /*    90 */    51,  234,  619,  618,  326,  619,  618,  166,  605,  492,
 /*   100 */   381,  378,  377,  235,  589,  583,  554,  495,    1,   59,
 /*   110 */    19,  376,  622,  621,   53,   53,   52,   52,   52,   51,
 /*   120 */   234,  571,  571,   57,   58,   48,  581,  580,  582,  582,
 /*   130 */    55,   55,   56,   56,   56,   56,  215,   54,   54,   54,
 /*   140 */    54,   53,   53,   52,   52,   52,   51,  234,  310,  224,
 /*   150 */    50,   47,  147,  177,  139,  281,  384,  276,  383,  169,
 /*   160 */   408,  553,  578,  578,  622,  621,  272,  224,  439,  550,
 /*   170 */   552,  410,  139,  281,  384,  276,  383,  169,  589,  583,
 /*   180 */   619,  618,  280,  620,  272,  195,  413,  309,  440,  441,
 /*   190 */   567,  491,  214,  279,  560,  600,   92,   57,   58,   48,
 /*   200 */   581,  580,  582,  582,   55,   55,   56,   56,   56,   56,
 /*   210 */   559,   54,   54,   54,   54,   53,   53,   52,   52,   52,
 /*   220 */    51,  234,  310,  464,  233,  232,  558,  133,  519,   50,
 /*   230 */    47,  147,  619,  618,  565,  436,  397,  515,  514,  518,
 /*   240 */   410,  387,  438,  389,  437,  622,  621,  442,  570,  433,
 /*   250 */   203,  390,  589,  583,    6,  413,  166,  670,  250,  381,
 /*   260 */   378,  377,  525,  190,  600,   92,  594,  571,  571,  465,
 /*   270 */   376,   57,   58,   48,  581,  580,  582,  582,   55,   55,
 /*   280 */    56,   56,   56,   56,  599,   54,   54,   54,   54,   53,
 /*   290 */    53,   52,   52,   52,   51,  234,  310,  592,  592,  592,
 /*   300 */   490,  182,  247,  548,  249,  397,  273,  410,    7,  439,
 /*   310 */   398,  606,   67,  619,  618,  620,  472,  256,  347,  255,
 /*   320 */   473,  620,  413,  576,  620,   65,  589,  583,  236,  440,
 /*   330 */   336,  600,   92,   68,  364,  192,  481,  622,  621,  547,
 /*   340 */   622,  621,  560,  323,  207,   57,   58,   48,  581,  580,
 /*   350 */   582,  582,   55,   55,   56,   56,   56,   56,  559,   54,
 /*   360 */    54,   54,   54,   53,   53,   52,   52,   52,   51,  234,
 /*   370 */   310,  410,  397,  146,  558,  531,  401,  348,  599,  166,
 /*   380 */   248,  204,  381,  378,  377,  541,  413,  171,  337,  570,
 /*   390 */   622,  621,   40,  376,   38,  600,   74,  465,  548,  490,
 /*   400 */   589,  583,  532,  350,  579,  619,  618,  297,  619,  618,
 /*   410 */   480,   67,  470,   39,  620,  599,  406,  574,  573,   57,
 /*   420 */    58,   48,  581,  580,  582,  582,   55,   55,   56,   56,
 /*   430 */    56,   56,  577,   54,   54,   54,   54,   53,   53,   52,
 /*   440 */    52,   52,   51,  234,  310,  256,  347,  255,  530,   52,
 /*   450 */    52,   52,   51,  234,  345,  564,  236,  386,  619,  618,
 /*   460 */   957,  185,  418,    2,  408,  410,  578,  578,  198,  197,
 /*   470 */   196,  499,  183,  167,  589,  583,  671,  570,  505,  506,
 /*   480 */   413,  267,  601,  672,  546,  208,  602,   36,  601,  600,
 /*   490 */    91,  468,  602,   57,   58,   48,  581,  580,  582,  582,
 /*   500 */    55,   55,   56,   56,   56,   56,  202,   54,   54,   54,
 /*   510 */    54,   53,   53,   52,   52,   52,   51,  234,  310,  599,
 /*   520 */   157,  408,  527,  578,  578,  263,  490,  265,  410,  873,
 /*   530 */   410,  474,  474,  366,  373,  410,  504,  428,   67,  290,
 /*   540 */   599,  620,  352,  413,  408,  413,  578,  578,  589,  583,
 /*   550 */   413,  382,  600,   92,  600,   16,  543,   62,  503,  600,
 /*   560 */    92,  408,  346,  578,  578,  168,   45,   57,   58,   48,
 /*   570 */   581,  580,  582,  582,   55,   55,   56,   56,   56,   56,
 /*   580 */   200,   54,   54,   54,   54,   53,   53,   52,   52,   52,
 /*   590 */    51,  234,  310,  393,  395,  534,  510,  617,  616,  615,
 /*   600 */   318,  314,  172,   66,  596,  410,  338,  596,  324,  571,
 /*   610 */   571,   50,   47,  147,  599,  629,  627,  330,  539,  315,
 /*   620 */   413,   30,  589,  583,  272,  236,  199,  144,  176,  600,
 /*   630 */    73,  420,  947,  620,  947,  420,  946,  351,  946,  175,
 /*   640 */   596,   57,   58,   48,  581,  580,  582,  582,   55,   55,
 /*   650 */    56,   56,   56,   56,  410,   54,   54,   54,   54,   53,
 /*   660 */    53,   52,   52,   52,   51,  234,  310,  261,  410,  413,
 /*   670 */   269,  208,  596,  363,  410,  596,  424,  360,  600,   69,
 /*   680 */   424,  327,  620,  413,   50,   47,  147,  410,  358,  413,
 /*   690 */   575,  553,  600,   94,  483,  509,  589,  583,  600,   97,
 /*   700 */   552,  484,  413,  620,  188,  599,  551,  563,  596,  566,
 /*   710 */   334,  600,   95,  205,  201,   57,   58,   48,  581,  580,
 /*   720 */   582,  582,   55,   55,   56,   56,   56,   56,  352,   54,
 /*   730 */    54,   54,   54,   53,   53,   52,   52,   52,   51,  234,
 /*   740 */   310,  410,  261,  410,  167,   22,  356,  599,  359,  623,
 /*   750 */    50,   47,  147,  548,  357,  562,  413,  620,  413,  332,
 /*   760 */   523,  270,  410,  167,  620,  600,  104,  600,  103,  603,
 /*   770 */   589,  583,  339,  539,  304,  423,  222,  413,  174,  304,
 /*   780 */   422,  561,  567,  405,  214,  260,  600,  106,  620,   57,
 /*   790 */    58,   48,  581,  580,  582,  582,   55,   55,   56,   56,
 /*   800 */    56,   56,  410,   54,   54,   54,   54,   53,   53,   52,
 /*   810 */    52,   52,   51,  234,  310,  410,  557,  413,  410,  421,
 /*   820 */   273,   35,  512,  146,  421,   12,  600,  107,  213,  144,
 /*   830 */   413,  410,   32,  413,  410,  620,  365,  353,  358,  600,
 /*   840 */   134,   11,  600,  135,  589,  583,  413,   21,  548,  413,
 /*   850 */   316,  148,  620,  620,  170,  600,   98,  223,  600,  102,
 /*   860 */   374,  168,  167,   57,   58,   48,  581,  580,  582,  582,
 /*   870 */    55,   55,   56,   56,   56,   56,  410,   54,   54,   54,
 /*   880 */    54,   53,   53,   52,   52,   52,   51,  234,  310,  410,
 /*   890 */   273,  413,  410,  273,  212,  469,  410,  167,  628,    2,
 /*   900 */   600,  101,  545,  221,  413,  620,  130,  413,  620,  410,
 /*   910 */   539,  413,  537,  600,   93,  315,  600,  100,  589,  583,
 /*   920 */   600,   77,  425,  305,  413,  620,  254,  322,  599,  458,
 /*   930 */   320,  171,  543,  600,   96,  521,  520,   57,   58,   48,
 /*   940 */   581,  580,  582,  582,   55,   55,   56,   56,   56,   56,
 /*   950 */   410,   54,   54,   54,   54,   53,   53,   52,   52,   52,
 /*   960 */    51,  234,  310,  410,  273,  413,  410,  457,  358,   35,
 /*   970 */   426,  230,  306,  319,  600,  138,  467,  520,  413,  620,
 /*   980 */   143,  413,  410,  620,  410,  353,  529,  600,  137,  142,
 /*   990 */   600,  136,  589,  583,  604,  261,  528,  413,  229,  413,
 /*  1000 */   620,  321,  495,   28,  543,  543,  600,   76,  600,   90,
 /*  1010 */   620,   57,   46,   48,  581,  580,  582,  582,   55,   55,
 /*  1020 */    56,   56,   56,   56,  410,   54,   54,   54,   54,   53,
 /*  1030 */    53,   52,   52,   52,   51,  234,  310,  261,  451,  413,
 /*  1040 */   410,  211,  611,  285,  283,  610,  609,  502,  600,   89,
 /*  1050 */   380,  217,  620,  128,  140,  413,  220,  620,  410,  409,
 /*  1060 */   620,  620,  588,  587,  600,   75,  589,  583,  271,  620,
 /*  1070 */    51,  234,  127,  413,  620,  599,  627,  330,   27,  375,
 /*  1080 */   449,  279,  600,   88,  585,  584,   58,   48,  581,  580,
 /*  1090 */   582,  582,   55,   55,   56,   56,   56,   56,  410,   54,
 /*  1100 */    54,   54,   54,   53,   53,   52,   52,   52,   51,  234,
 /*  1110 */   310,  586,  410,  413,  410,  261,  593,  165,  399,  556,
 /*  1120 */   126,  371,  600,   87,  478,  186,  123,  413,  367,  413,
 /*  1130 */   620,  620,  410,  620,  620,  410,  600,   99,  600,   86,
 /*  1140 */   589,  583,  475,  122,  258,  171,  471,  413,  160,  121,
 /*  1150 */   413,   14,  159,  463,   25,   24,  600,   17,  448,  600,
 /*  1160 */    85,   48,  581,  580,  582,  582,   55,   55,   56,   56,
 /*  1170 */    56,   56,  158,   54,   54,   54,   54,   53,   53,   52,
 /*  1180 */    52,   52,   51,  234,   44,  404,  261,    3,  544,  261,
 /*  1190 */   540,  414,  621,  460,  119,  118,  538,  275,   10,  349,
 /*  1200 */     4,  620,  407,  620,  620,  620,  116,   44,  404,  410,
 /*  1210 */     3,  620,  620,  410,  414,  621,  456,  454,  252,  450,
 /*  1220 */   508,  402,  111,  109,  413,  407,  155,  444,  413,  447,
 /*  1230 */   435,  565,  219,  600,   84,  620,  108,  600,   83,   64,
 /*  1240 */   434,  417,  625,  150,  402,  333,  410,  237,  238,  124,
 /*  1250 */   274,   41,   42,  533,  565,  206,  189,  261,   43,  412,
 /*  1260 */   411,  413,  261,  594,  488,  620,  329,  149,  419,  268,
 /*  1270 */   600,   72,  620,  266,   41,   42,  181,  620,  410,  620,
 /*  1280 */   105,   43,  412,  411,  620,  624,  594,  614,  620,  599,
 /*  1290 */   228,  125,  313,  413,  592,  592,  592,  591,  590,   13,
 /*  1300 */   218,  410,  600,   71,  236,  244,   44,  404,  264,    3,
 /*  1310 */   312,  613,  340,  414,  621,  180,  413,  592,  592,  592,
 /*  1320 */   591,  590,   13,  620,  407,  600,   82,  410,  416,   34,
 /*  1330 */   404,  410,    3,  410,  262,  410,  414,  621,  612,  331,
 /*  1340 */   178,  415,  413,  402,    8,  236,  413,  407,  413,  620,
 /*  1350 */   413,  600,   81,  565,  257,  600,   80,  600,   70,  600,
 /*  1360 */    18,  598,  361,  462,  461,   30,  402,  294,   31,  620,
 /*  1370 */   293,  354,  251,   41,   42,  410,  565,  620,  620,  620,
 /*  1380 */    43,  412,  411,  453,  396,  594,  620,  620,  394,   61,
 /*  1390 */   413,  292,  443,  622,  621,  243,   41,   42,  620,  600,
 /*  1400 */    79,  597,  291,   43,  412,  411,   60,  620,  594,  240,
 /*  1410 */   620,  410,  231,   37,  555,  173,  592,  592,  592,  591,
 /*  1420 */   590,   13,  216,  239,  620,  184,  413,  302,  301,  300,
 /*  1430 */   179,  298,  388,  565,  452,  600,   78,  286,  620,  592,
 /*  1440 */   592,  592,  591,  590,   13,  429,   29,  413,  151,  289,
 /*  1450 */   242,  145,  392,  194,  193,  288,  600,    9,  542,  241,
 /*  1460 */   620,  525,  391,  284,  620,  594,  620,  620,  522,  536,
 /*  1470 */   620,  535,  153,  385,  465,  516,  282,  325,  154,  517,
 /*  1480 */   277,  152,  512,  511,  513,  129,  226,  308,  487,  486,
 /*  1490 */   485,  164,  372,  493,  307,  227,  592,  592,  592,  225,
 /*  1500 */   479,  163,  368,  370,  162,  476,  210,  477,   26,  259,
 /*  1510 */   161,  466,  362,  141,  132,  120,  117,  455,  156,  115,
 /*  1520 */   344,  343,  256,  342,  245,  114,  113,  446,  311,  112,
 /*  1530 */    23,  317,  432,  236,  131,  431,  110,  430,   20,  427,
 /*  1540 */   608,  595,  295,   63,  379,  287,  509,  191,  278,  403,
 /*  1550 */   572,  569,  497,  498,  496,  494,  335,  459,  445,  303,
 /*  1560 */   296,  246,  341,  355,    5,  568,  369,  507,  253,  549,
 /*  1570 */   526,  209,  400,  501,  500,  524,  234,  958,  489,  482,
};
static const YYCODETYPE yy_lookahead[] = {
 /*     0 */    19,  169,  170,  171,   22,   24,   24,   26,   77,   78,
 /*    10 */    79,   80,   81,   82,   83,   84,   85,   86,   87,   88,
 /*    20 */    89,   90,   91,   92,   26,   27,    1,   26,   27,   15,
 /*    30 */    49,   50,   77,   78,   79,   80,  116,   82,   83,   84,
 /*    40 */    85,   86,   87,   88,   89,   90,   91,   92,  128,   68,
 /*    50 */    69,   70,   71,   72,   73,   74,   75,   76,   77,   78,
 /*    60 */    79,   80,  230,   82,   83,   84,   85,   86,   87,   88,
 /*    70 */    89,   90,   91,   92,   19,   94,   19,   23,   86,   87,
 /*    80 */    25,   82,   83,   84,   85,   86,   87,   88,   89,   90,
 /*    90 */    91,   92,   94,   95,   19,   94,   95,   96,  172,  173,

 /*   100 */    99,  100,  101,  197,   49,   50,  177,  181,   22,   54,
 /*   110 */   204,  110,   26,   27,   86,   87,   88,   89,   90,   91,
 /*   120 */    92,  129,  130,   68,   69,   70,   71,   72,   73,   74,
 /*   130 */    75,   76,   77,   78,   79,   80,   22,   82,   83,   84,
 /*   140 */    85,   86,   87,   88,   89,   90,   91,   92,   19,   92,
 /*   150 */   221,  222,  223,   96,   97,   98,   99,  100,  101,  102,

 /*   160 */   112,   32,  114,  115,   26,   27,  109,   92,  150,   25,
 /*   170 */    41,  150,   97,   98,   99,  100,  101,  102,   49,   50,
 /*   180 */    94,   95,   98,  165,  109,   25,  165,  163,  170,  171,
 /*   190 */   166,  167,  168,  109,   12,  174,  175,   68,   69,   70,
 /*   200 */    71,   72,   73,   74,   75,   76,   77,   78,   79,   80,
 /*   210 */    28,   82,   83,   84,   85,   86,   87,   88,   89,   90,
 /*   220 */    91,   92,   19,   11,   86,   87,   44,   24,   46,  221,

 /*   230 */   222,  223,   94,   95,   66,   97,  215,    7,    8,   57,
 /*   240 */   150,  220,  104,   19,  106,   26,   27,  229,  230,  241,
 /*   250 */   160,   27,   49,   50,   22,  165,   96,  118,   16,   99,
 /*   260 */   100,  101,   94,  119,  174,  175,   98,  129,  130,   57,
 /*   270 */   110,   68,   69,   70,   71,   72,   73,   74,   75,   76,
 /*   280 */    77,   78,   79,   80,  194,   82,   83,   84,   85,   86,
 /*   290 */    87,   88,   89,   90,   91,   92,   19,  129,  130,  131,

 /*   300 */   150,   23,   60,   25,   62,  215,  150,  150,   76,  150,
 /*   310 */   220,  161,  162,   94,   95,  165,   30,  105,  106,  107,
 /*   320 */    34,  165,  165,   23,  165,   25,   49,   50,  116,  170,
 /*   330 */   171,  174,  175,   22,   48,  185,  186,   26,   27,  120,
 /*   340 */    26,   27,   12,  187,  160,   68,   69,   70,   71,   72,
 /*   350 */    73,   74,   75,   76,   77,   78,   79,   80,   28,   82,
 /*   360 */    83,   84,   85,   86,   87,   88,   89,   90,   91,   92,

 /*   370 */    19,  150,  215,   95,   44,   23,   46,  220,  194,   96,
 /*   380 */   138,  160,   99,  100,  101,   23,  165,   25,  229,  230,
 /*   390 */    26,   27,  135,  110,  137,  174,  175,   57,  120,  150,
 /*   400 */    49,   50,   88,  219,  113,   94,   95,  158,   94,   95,
 /*   410 */   161,  162,   21,  136,  165,  194,  169,  170,  171,   68,

 /*   420 */    69,   70,   71,   72,   73,   74,   75,   76,   77,   78,
 /*   430 */    79,   80,   23,   82,   83,   84,   85,   86,   87,   88,
 /*   440 */    89,   90,   91,   92,   19,  105,  106,  107,   23,   88,

 /*   450 */    89,   90,   91,   92,   63,   23,  116,   88,   94,   95,
 /*   460 */   142,  143,  144,  145,  112,  150,  114,  115,  105,  106,
 /*   470 */   107,   23,   23,   25,   49,   50,  118,  230,   97,   98,
 /*   480 */   165,   16,  113,  118,  120,  160,  117,  136,  113,  174,
 /*   490 */   175,  100,  117,   68,   69,   70,   71,   72,   73,   74,
 /*   500 */    75,   76,   77,   78,   79,   80,  160,   82,   83,   84,
 /*   510 */    85,   86,   87,   88,   89,   90,   91,   92,   19,  194,
 /*   520 */    25,  112,   23,  114,  115,   60,  150,   62,  150,  138,

 /*   530 */   150,  105,  106,  107,   19,  150,   36,  161,  162,  224,
 /*   540 */   194,  165,  217,  165,  112,  165,  114,  115,   49,   50,
 /*   550 */   165,   51,  174,  175,  174,  175,  166,  232,   58,  174,
 /*   560 */   175,  112,  237,  114,  115,   50,   22,   68,   69,   70,
 /*   570 */    71,   72,   73,   74,   75,   76,   77,   78,   79,   80,
 /*   580 */   160,   82,   83,   84,   85,   86,   87,   88,   89,   90,
 /*   590 */    91,   92,   19,  215,  214,  205,   23,    7,    8,    9,

 /*   600 */   215,  155,   24,   22,   26,  150,   97,   26,  108,  129,
 /*   610 */   130,  221,  222,  223,  194,    0,    1,    2,  150,  104,
 /*   620 */   165,  126,   49,   50,  109,  116,  206,  207,  118,  174,
 /*   630 */   175,   22,   23,  165,   25,   22,   23,  128,   25,  118,
 /*   640 */    26,   68,   69,   70,   71,   72,   73,   74,   75,   76,
 /*   650 */    77,   78,   79,   80,  150,   82,   83,   84,   85,   86,
 /*   660 */    87,   88,   89,   90,   91,   92,   19,  150,  150,  165,

 /*   670 */    23,  160,   94,  227,  150,   94,   67,  231,  174,  175,
 /*   680 */    67,  213,  165,  165,  221,  222,  223,  150,  150,  165,
 /*   690 */    23,   32,  174,  175,  181,  182,   49,   50,  174,  175,
 /*   700 */    41,  188,  165,  165,   22,  194,  177,   11,   94,   23,
 /*   710 */   193,  174,  175,  160,   22,   68,   69,   70,   71,   72,
 /*   720 */    73,   74,   75,   76,   77,   78,   79,   80,  217,   82,
 /*   730 */    83,   84,   85,   86,   87,   88,   89,   90,   91,   92,
 /*   740 */    19,  150,  150,  150,   25,   24,   19,  194,  237,  150,

 /*   750 */   221,  222,  223,   25,   27,   23,  165,  165,  165,  242,
 /*   760 */   165,   23,  150,   25,  165,  174,  175,  174,  175,  174,
 /*   770 */    49,   50,  219,  150,   22,   23,  238,  165,   25,   22,
 /*   780 */    23,   23,  166,  167,  168,  193,  174,  175,  165,   68,

 /*   790 */    69,   70,   71,   72,   73,   74,   75,   76,   77,   78,
 /*   800 */    79,   80,  150,   82,   83,   84,   85,   86,   87,   88,
 /*   810 */    89,   90,   91,   92,   19,  150,   23,  165,  150,   67,

 /*   820 */   150,   25,  103,   95,   67,   35,  174,  175,  206,  207,
 /*   830 */   165,  150,   25,  165,  150,  165,  213,  150,  150,  174,
 /*   840 */   175,   35,  174,  175,   49,   50,  165,   52,  120,  165,
 /*   850 */   245,  246,  165,  165,   35,  174,  175,  187,  174,  175,
 /*   860 */    23,   50,   25,   68,   69,   70,   71,   72,   73,   74,
 /*   870 */    75,   76,   77,   78,   79,   80,  150,   82,   83,   84,
 /*   880 */    85,   86,   87,   88,   89,   90,   91,   92,   19,  150,
 /*   890 */   150,  165,  150,  150,  160,   23,  150,   25,  144,  145,

 /*   900 */   174,  175,  120,  216,  165,  165,   22,  165,  165,  150,
 /*   910 */   150,  165,   27,  174,  175,  104,  174,  175,   49,   50,
 /*   920 */   174,  175,  247,  248,  165,  165,  238,  187,  194,   23,
 /*   930 */   187,   25,  166,  174,  175,  190,  191,   68,   69,   70,
 /*   940 */    71,   72,   73,   74,   75,   76,   77,   78,   79,   80,
 /*   950 */   150,   82,   83,   84,   85,   86,   87,   88,   89,   90,
 /*   960 */    91,   92,   19,  150,  150,  165,  150,   23,  150,   25,

 /*   970 */    23,  205,   25,  213,  174,  175,  190,  191,  165,  165,
 /*   980 */   118,  165,  150,  165,  150,  150,   23,  174,  175,   39,
 /*   990 */   174,  175,   49,   50,  173,  150,   23,  165,   52,  165,
 /*  1000 */   165,  187,  181,   22,  166,  166,  174,  175,  174,  175,
 /*  1010 */   165,   68,   69,   70,   71,   72,   73,   74,   75,   76,
 /*  1020 */    77,   78,   79,   80,  150,   82,   83,   84,   85,   86,
 /*  1030 */    87,   88,   89,   90,   91,   92,   19,  150,  193,  165,
 /*  1040 */   150,  160,  150,  205,  205,  150,  150,   29,  174,  175,
 /*  1050 */    52,  216,  165,   22,  150,  165,  238,  165,  150,  150,
 /*  1060 */   165,  165,   49,   50,  174,  175,   49,   50,   23,  165,
 /*  1070 */    91,   92,   22,  165,  165,  194,    1,    2,   22,   52,
 /*  1080 */   193,  109,  174,  175,   71,   72,   69,   70,   71,   72,
 /*  1090 */    73,   74,   75,   76,   77,   78,   79,   80,  150,   82,
 /*  1100 */    83,   84,   85,   86,   87,   88,   89,   90,   91,   92,
 /*  1110 */    19,   98,  150,  165,  150,  150,  150,  102,  150,  150,
 /*  1120 */    22,   19,  174,  175,   20,   24,  104,  165,   43,  165,
 /*  1130 */   165,  165,  150,  165,  165,  150,  174,  175,  174,  175,
 /*  1140 */    49,   50,   59,   53,  138,   25,   53,  165,  104,   22,
 /*  1150 */   165,    5,  118,    1,   76,   76,  174,  175,  193,  174,
 /*  1160 */   175,   70,   71,   72,   73,   74,   75,   76,   77,   78,
 /*  1170 */    79,   80,   35,   82,   83,   84,   85,   86,   87,   88,
 /*  1180 */    89,   90,   91,   92,   19,   20,  150,   22,  150,  150,
 /*  1190 */   150,   26,   27,   27,  108,  127,  150,  150,   22,   25,
 /*  1200 */    22,  165,   37,  165,  165,  165,  119,   19,   20,  150,
 /*  1210 */    22,  165,  165,  150,   26,   27,   23,    1,   16,   20,
 /*  1220 */   150,   56,  119,  108,  165,   37,  121,  128,  165,  193,
 /*  1230 */    23,   66,  193,  174,  175,  165,  127,  174,  175,   16,
 /*  1240 */    23,  146,  147,   15,   56,   65,  150,  152,  140,  154,
 /*  1250 */   150,   86,   87,   88,   66,  160,   22,  150,   93,   94,
 /*  1260 */    95,  165,  150,   98,  150,  165,    3,  246,    4,  150,
 /*  1270 */   174,  175,  165,  150,   86,   87,    6,  165,  150,  165,
 /*  1280 */   164,   93,   94,   95,  165,  149,   98,  149,  165,  194,
 /*  1290 */   180,  180,  249,  165,  129,  130,  131,  132,  133,  134,
 /*  1300 */   193,  150,  174,  175,  116,  193,   19,   20,  150,   22,
 /*  1310 */   249,  149,  217,   26,   27,  151,  165,  129,  130,  131,
 /*  1320 */   132,  133,  134,  165,   37,  174,  175,  150,  149,   19,
 /*  1330 */    20,  150,   22,  150,  150,  150,   26,   27,   13,  244,
 /*  1340 */   151,  159,  165,   56,   25,  116,  165,   37,  165,  165,
 /*  1350 */   165,  174,  175,   66,  150,  174,  175,  174,  175,  174,
 /*  1360 */   175,  194,  150,  150,  150,  126,   56,  199,  124,  165,
 /*  1370 */   200,  150,  150,   86,   87,  150,   66,  165,  165,  165,
 /*  1380 */    93,   94,   95,  150,  122,   98,  165,  165,  123,   22,
 /*  1390 */   165,  201,  150,   26,   27,  150,   86,   87,  165,  174,
 /*  1400 */   175,  203,  202,   93,   94,   95,  125,  165,   98,  150,
 /*  1410 */   165,  150,  225,  135,  157,  118,  129,  130,  131,  132,
 /*  1420 */   133,  134,    5,  150,  165,  157,  165,   10,   11,   12,
 /*  1430 */    13,   14,  150,   66,   17,  174,  175,  210,  165,  129,
 /*  1440 */   130,  131,  132,  133,  134,  150,  104,  165,   31,  150,
 /*  1450 */    33,  150,  150,   86,   87,  150,  174,  175,  211,   42,
 /*  1460 */   165,   94,  121,  210,  165,   98,  165,  165,  176,  211,
 /*  1470 */   165,  211,   55,  104,   57,  184,  210,   47,   61,  176,
 /*  1480 */   176,   64,  103,  176,  178,   22,   92,  179,  176,  176,
 /*  1490 */   176,  156,   18,  184,  179,  228,  129,  130,  131,  228,
 /*  1500 */   157,  156,   45,  157,  156,  236,  157,  157,  135,  235,
 /*  1510 */   156,  189,  157,   68,  218,  189,   22,  199,  156,  192,
 /*  1520 */   157,   18,  105,  106,  107,  192,  192,  199,  111,  192,
 /*  1530 */   240,  157,   40,  116,  218,  157,  189,  157,  240,   38,
 /*  1540 */   153,  166,  198,  243,  178,  209,  182,  196,  177,  226,
 /*  1550 */   230,  230,  166,  177,  177,  166,  139,  199,  199,  148,
 /*  1560 */   195,  209,  209,  239,  196,  166,  234,  183,  239,  208,
 /*  1570 */   174,  233,  191,  183,  183,  174,   92,  250,  186,  186,
};
#define YY_SHIFT_USE_DFLT (-81)
#define YY_SHIFT_COUNT (417)
#define YY_SHIFT_MIN   (-80)
#define YY_SHIFT_MAX   (1503)
static const short yy_shift_ofst[] = {
 /*     0 */  1075, 1188, 1417, 1188, 1287, 1287,  138,  138,    1,  -19,
 /*    10 */  1287, 1287, 1287, 1287,  340,   -2,  129,  129,  795, 1165,
 /*    20 */  1287, 1287, 1287, 1287, 1287, 1287, 1287, 1287, 1287, 1287,
 /*    30 */  1287, 1287, 1287, 1287, 1287, 1287, 1287, 1287, 1287, 1287,
 /*    40 */  1287, 1287, 1287, 1287, 1287, 1287, 1287, 1287, 1310, 1287,
 /*    50 */  1287, 1287, 1287, 1287, 1287, 1287, 1287, 1287, 1287, 1287,
 /*    60 */  1287, 1287,  212,   -2,   -2,   -8,   -8,  614, 1229,   55,
 /*    70 */   721,  647,  573,  499,  425,  351,  277,  203,  869,  869,
 /*    80 */   869,  869,  869,  869,  869,  869,  869,  869,  869,  869,
 /*    90 */   869,  869,  869,  943,  869, 1017, 1091, 1091,  -69,  -45,
 /*   100 */   -45,  -45,  -45,  -45,   -1,   57,   28,  361,   -2,   -2,
 /*   110 */    -2,   -2,   -2,   -2,   -2,   -2,   -2,   -2,   -2,   -2,
 /*   120 */    -2,   -2,   -2,   -2,  391,  515,   -2,   -2,   -2,   -2,
 /*   130 */    -2,  509,  -80,  614,  979, 1484,  -81,  -81,  -81, 1367,
 /*   140 */    75,  182,  182,  314,  311,  364,  219,   86,  613,  609,
 /*   150 */    -2,   -2,   -2,   -2,   -2,   -2,   -2,   -2,   -2,   -2,
 /*   160 */    -2,   -2,   -2,   -2,   -2,   -2,   -2,   -2,   -2,   -2,
 /*   170 */    -2,   -2,   -2,   -2,   -2,   -2,   -2,   -2,   -2,   -2,
 /*   180 */    -2,   -2,  578,  578,  578,  615, 1229, 1229, 1229,  -81,
 /*   190 */   -81,  -81,  160,  168,  168,  283,  500,  500,  500,  278,
 /*   200 */   449,  330,  432,  409,  352,   48,   48,   48,   48,  426,
 /*   210 */   286,   48,   48,  728,  581,  369,  590,  495,  224,  224,
 /*   220 */   727,  495,  727,  719,  614,  659,  614,  659,  811,  659,
 /*   230 */   224,  257,  480,  480,  614,  144,  375,  -18, 1501, 1297,
 /*   240 */  1297, 1492, 1492, 1297, 1494, 1445, 1239, 1503, 1503, 1503,
 /*   250 */  1503, 1297, 1474, 1239, 1494, 1445, 1445, 1297, 1474, 1373,
 /*   260 */  1457, 1297, 1297, 1474, 1297, 1474, 1297, 1474, 1463, 1369,
 /*   270 */  1369, 1369, 1430, 1394, 1394, 1463, 1369, 1379, 1369, 1430,
 /*   280 */  1369, 1369, 1341, 1342, 1341, 1342, 1341, 1342, 1297, 1297,
 /*   290 */  1278, 1281, 1262, 1244, 1265, 1239, 1229, 1319, 1325, 1325,
 /*   300 */  1270, 1270, 1270, 1270,  -81,  -81,  -81,  -81,  -81,  -81,
 /*   310 */  1013,  242,  757,  752,  465,  363,  947,  232,  944,  906,
 /*   320 */   872,  837,  738,  448,  381,  230,   84,  362,  300, 1264,
 /*   330 */  1263, 1234, 1108, 1228, 1180, 1223, 1217, 1207, 1099, 1174,
 /*   340 */  1109, 1115, 1103, 1199, 1105, 1202, 1216, 1087, 1193, 1178,
 /*   350 */  1174, 1176, 1068, 1079, 1078, 1086, 1166, 1137, 1034, 1152,
 /*   360 */  1146, 1127, 1044, 1006, 1093, 1120, 1090, 1083, 1085, 1022,
 /*   370 */  1101, 1104, 1102,  972, 1015, 1098, 1027, 1056, 1050, 1045,
 /*   380 */  1031,  998, 1018,  981,  946,  950,  973,  963,  862,  885,
 /*   390 */   819,  884,  782,  796,  806,  807,  790,  796,  793,  758,
 /*   400 */   753,  732,  692,  696,  682,  686,  667,  544,  291,  521,
 /*   410 */   510,  365,  358,  139,  114,   54,   14,   25,
};
#define YY_REDUCE_USE_DFLT (-169)
#define YY_REDUCE_COUNT (309)
#define YY_REDUCE_MIN   (-168)
#define YY_REDUCE_MAX   (1411)
static const short yy_reduce_ofst[] = {
 /*     0 */   318,   90, 1095,  221,  157,   21,  159,   18,  150,  390,
 /*    10 */   385,  378,  380,  315,  325,  249,  529,  -71,    8, 1282,
 /*    20 */  1261, 1225, 1185, 1183, 1181, 1177, 1151, 1128, 1096, 1063,
 /*    30 */  1059,  985,  982,  964,  962,  948,  908,  890,  874,  834,
 /*    40 */   832,  816,  813,  800,  759,  746,  742,  739,  726,  684,
 /*    50 */   681,  668,  665,  652,  612,  593,  591,  537,  524,  518,
 /*    60 */   504,  455,  511,  376,  517,  247, -168,   24,  420,  463,
 /*    70 */   463,  463,  463,  463,  463,  463,  463,  463,  463,  463,
 /*    80 */   463,  463,  463,  463,  463,  463,  463,  463,  463,  463,
 /*    90 */   463,  463,  463,  463,  463,  463,  463,  463,  463,  463,
 /*   100 */   463,  463,  463,  463,  463,  -74,  463,  463, 1112,  835,
 /*   110 */  1107, 1039, 1036,  965,  887,  845,  818,  760,  688,  687,
 /*   120 */   538,  743,  623,  592,  446,  513,  814,  740,  670,  156,
 /*   130 */   468,  553,  184,  616,  463,  463,  463,  463,  463,  595,
 /*   140 */   821,  786,  745,  909, 1305, 1302, 1301, 1299,  675,  675,
 /*   150 */  1295, 1273, 1259, 1245, 1242, 1233, 1222, 1221, 1214, 1213,
 /*   160 */  1212, 1204, 1184, 1158, 1123, 1119, 1114, 1100, 1070, 1047,
 /*   170 */  1046, 1040, 1038,  969,  968,  966,  909,  904,  896,  895,
 /*   180 */   892,  599,  839,  838,  766,  754,  881,  734,  346,  605,
 /*   190 */   622,  -94, 1393, 1401, 1396, 1392, 1391, 1390, 1384, 1361,
 /*   200 */  1365, 1381, 1365, 1365, 1365, 1365, 1365, 1365, 1365, 1332,
 /*   210 */  1338, 1365, 1365, 1361, 1399, 1368, 1411, 1359, 1353, 1352,
 /*   220 */  1329, 1358, 1324, 1366, 1389, 1377, 1386, 1376, 1364, 1371,
 /*   230 */  1336, 1323, 1321, 1320, 1375, 1344, 1351, 1387, 1300, 1380,
 /*   240 */  1378, 1298, 1290, 1374, 1316, 1347, 1328, 1337, 1334, 1333,
 /*   250 */  1327, 1363, 1362, 1318, 1296, 1326, 1322, 1355, 1354, 1269,
 /*   260 */  1274, 1350, 1349, 1348, 1346, 1345, 1343, 1335, 1315, 1314,
 /*   270 */  1313, 1312, 1309, 1271, 1267, 1308, 1307, 1306, 1304, 1291,
 /*   280 */  1303, 1292, 1260, 1266, 1258, 1253, 1247, 1227, 1268, 1257,
 /*   290 */  1187, 1198, 1200, 1190, 1170, 1168, 1167, 1182, 1189, 1164,
 /*   300 */  1179, 1162, 1138, 1136, 1061, 1043, 1021, 1111, 1110, 1116,

};
static const YYACTIONTYPE yy_default[] = {
 /*     0 */   634,  868,  956,  956,  868,  868,  956,  956,  956,  758,
 /*    10 */   956,  956,  956,  866,  956,  956,  786,  786,  930,  956,
 /*    20 */   956,  956,  956,  956,  956,  956,  956,  956,  956,  956,
 /*    30 */   956,  956,  956,  956,  956,  956,  956,  956,  956,  956,
 /*    40 */   956,  956,  956,  956,  956,  956,  956,  956,  956,  956,
 /*    50 */   956,  956,  956,  956,  956,  956,  956,  956,  956,  956,
 /*    60 */   956,  956,  956,  956,  956,  956,  956,  673,  762,  792,
 /*    70 */   956,  956,  956,  956,  956,  956,  956,  956,  929,  931,
 /*    80 */   800,  799,  909,  773,  797,  790,  794,  869,  862,  863,
 /*    90 */   861,  865,  870,  956,  793,  829,  846,  828,  840,  845,
 /*   100 */   852,  844,  841,  831,  830,  665,  832,  833,  956,  956,
 /*   110 */   956,  956,  956,  956,  956,  956,  956,  956,  956,  956,
 /*   120 */   956,  956,  956,  956,  660,  727,  956,  956,  956,  956,
 /*   130 */   956,  956,  956,  956,  834,  835,  849,  848,  847,  956,
 /*   140 */   956,  956,  956,  956,  956,  956,  956,  956,  956,  956,
 /*   150 */   956,  936,  934,  956,  881,  956,  956,  956,  956,  956,
 /*   160 */   956,  956,  956,  956,  956,  956,  956,  956,  956,  956,
 /*   170 */   956,  956,  956,  956,  956,  956,  956,  956,  956,  956,
 /*   180 */   956,  640,  758,  758,  758,  634,  956,  956,  956,  948,
 /*   190 */   762,  752,  718,  956,  956,  956,  956,  956,  956,  956,
 /*   200 */   956,  956,  956,  956,  956,  802,  741,  919,  921,  956,
 /*   210 */   902,  739,  662,  760,  675,  750,  642,  796,  775,  775,
 /*   220 */   914,  796,  914,  699,  956,  786,  956,  786,  696,  786,
 /*   230 */   775,  864,  956,  956,  956,  759,  750,  956,  941,  766,
 /*   240 */   766,  933,  933,  766,  808,  731,  796,  738,  738,  738,
 /*   250 */   738,  766,  657,  796,  808,  731,  731,  766,  657,  908,
 /*   260 */   906,  766,  766,  657,  766,  657,  766,  657,  874,  729,
 /*   270 */   729,  729,  714,  878,  878,  874,  729,  699,  729,  714,
 /*   280 */   729,  729,  779,  774,  779,  774,  779,  774,  766,  766,
 /*   290 */   956,  791,  780,  789,  787,  796,  956,  717,  650,  650,
 /*   300 */   639,  639,  639,  639,  953,  953,  948,  701,  701,  683,
 /*   310 */   956,  956,  956,  956,  956,  956,  956,  883,  956,  956,
 /*   320 */   956,  956,  956,  956,  956,  956,  956,  956,  956,  956,
 /*   330 */   635,  943,  956,  956,  940,  956,  956,  956,  956,  801,
 /*   340 */   956,  956,  956,  956,  956,  956,  956,  956,  956,  956,
 /*   350 */   918,  956,  956,  956,  956,  956,  956,  956,  912,  956,
 /*   360 */   956,  956,  956,  956,  956,  905,  904,  956,  956,  956,
 /*   370 */   956,  956,  956,  956,  956,  956,  956,  956,  956,  956,
 /*   380 */   956,  956,  956,  956,  956,  956,  956,  956,  956,  956,
 /*   390 */   956,  956,  956,  788,  956,  781,  956,  867,  956,  956,
 /*   400 */   956,  956,  956,  956,  956,  956,  956,  956,  744,  817,
 /*   410 */   956,  816,  820,  815,  667,  956,  648,  956,  631,  636,
 /*   420 */   952,  955,  954,  951,  950,  949,  944,  942,  939,  938,
 /*   430 */   937,  935,  932,  928,  887,  885,  892,  891,  890,  889,
 /*   440 */   888,  886,  884,  882,  803,  798,  795,  927,  880,  740,
 /*   450 */   737,  736,  656,  945,  911,  920,  807,  806,  809,  917,
 /*   460 */   916,  915,  913,  910,  897,  805,  804,  732,  872,  871,
 /*   470 */   659,  901,  900,  899,  903,  907,  898,  768,  658,  655,
 /*   480 */   664,  721,  720,  728,  726,  725,  724,  723,  722,  719,
 /*   490 */   666,  674,  685,  713,  698,  697,  877,  879,  876,  875,

 /*   500 */   706,  705,  711,  710,  709,  708,  707,  704,  703,  702,
 /*   510 */   695,  694,  700,  693,  716,  715,  712,  692,  735,  734,
 /*   520 */   733,  730,  691,  690,  689,  820,  688,  687,  826,  825,
 /*   530 */   813,  856,  755,  754,  753,  765,  764,  777,  776,  811,
 /*   540 */   810,  778,  763,  757,  756,  772,  771,  770,  769,  761,
 /*   550 */   751,  783,  785,  784,  782,  858,  767,  855,  926,  925,
 /*   560 */   924,  923,  922,  860,  859,  827,  824,  678,  679,  895,
 /*   570 */   894,  896,  893,  681,  680,  677,  676,  857,  746,  745,

 /*   580 */   853,  850,  842,  838,  854,  851,  843,  839,  837,  836,
 /*   590 */   822,  821,  819,  818,  814,  823,  669,  747,  743,  742,
 /*   600 */   812,  749,  748,  686,  684,  682,  663,  661,  654,  652,
 /*   610 */   651,  653,  649,  647,  646,  645,  644,  643,  672,  671,
 /*   620 */   670,  668,  667,  641,  638,  637,  633,  632,  630,

};

/* The next table maps tokens into fallback tokens.  If a construct
** like the following:
** 
**      %fallback ID X Y Z.
**
................................................................................
  "ecmd",          "explain",       "cmdx",          "cmd",         
  "transtype",     "trans_opt",     "nm",            "savepoint_opt",
  "create_table",  "create_table_args",  "createkw",      "temp",        
  "ifnotexists",   "dbnm",          "columnlist",    "conslist_opt",
  "select",        "column",        "columnid",      "type",        
  "carglist",      "id",            "ids",           "typetoken",   
  "typename",      "signed",        "plus_num",      "minus_num",   
  "carg",          "ccons",         "term",          "expr",        
  "onconf",        "sortorder",     "autoinc",       "idxlist_opt", 
  "refargs",       "defer_subclause",  "refarg",        "refact",      
  "init_deferred_pred_opt",  "conslist",      "tcons",         "idxlist",     
  "defer_subclause_opt",  "orconf",        "resolvetype",   "raisetype",   
  "ifexists",      "fullname",      "oneselect",     "multiselect_op",
  "distinct",      "selcollist",    "from",          "where_opt",   
  "groupby_opt",   "having_opt",    "orderby_opt",   "limit_opt",   
  "sclp",          "as",            "seltablist",    "stl_prefix",  
  "joinop",        "indexed_opt",   "on_opt",        "using_opt",   
  "joinop2",       "inscollist",    "sortlist",      "nexprlist",   
................................................................................
 /*  46 */ "typetoken ::= typename",
 /*  47 */ "typetoken ::= typename LP signed RP",
 /*  48 */ "typetoken ::= typename LP signed COMMA signed RP",
 /*  49 */ "typename ::= ids",
 /*  50 */ "typename ::= typename ids",
 /*  51 */ "signed ::= plus_num",
 /*  52 */ "signed ::= minus_num",
 /*  53 */ "carglist ::= carglist carg",
 /*  54 */ "carglist ::=",
 /*  55 */ "carg ::= CONSTRAINT nm ccons",
 /*  56 */ "carg ::= ccons",
 /*  57 */ "ccons ::= DEFAULT term",
 /*  58 */ "ccons ::= DEFAULT LP expr RP",
 /*  59 */ "ccons ::= DEFAULT PLUS term",
 /*  60 */ "ccons ::= DEFAULT MINUS term",
 /*  61 */ "ccons ::= DEFAULT id",
 /*  62 */ "ccons ::= NULL onconf",
 /*  63 */ "ccons ::= NOT NULL onconf",
 /*  64 */ "ccons ::= PRIMARY KEY sortorder onconf autoinc",
 /*  65 */ "ccons ::= UNIQUE onconf",
 /*  66 */ "ccons ::= CHECK LP expr RP",
 /*  67 */ "ccons ::= REFERENCES nm idxlist_opt refargs",
 /*  68 */ "ccons ::= defer_subclause",
 /*  69 */ "ccons ::= COLLATE ids",
 /*  70 */ "autoinc ::=",
 /*  71 */ "autoinc ::= AUTOINCR",
 /*  72 */ "refargs ::=",
 /*  73 */ "refargs ::= refargs refarg",
 /*  74 */ "refarg ::= MATCH nm",
 /*  75 */ "refarg ::= ON INSERT refact",
 /*  76 */ "refarg ::= ON DELETE refact",
 /*  77 */ "refarg ::= ON UPDATE refact",
 /*  78 */ "refact ::= SET NULL",
 /*  79 */ "refact ::= SET DEFAULT",
 /*  80 */ "refact ::= CASCADE",
 /*  81 */ "refact ::= RESTRICT",
 /*  82 */ "refact ::= NO ACTION",
 /*  83 */ "defer_subclause ::= NOT DEFERRABLE init_deferred_pred_opt",
 /*  84 */ "defer_subclause ::= DEFERRABLE init_deferred_pred_opt",
 /*  85 */ "init_deferred_pred_opt ::=",
 /*  86 */ "init_deferred_pred_opt ::= INITIALLY DEFERRED",
 /*  87 */ "init_deferred_pred_opt ::= INITIALLY IMMEDIATE",
 /*  88 */ "conslist_opt ::=",
 /*  89 */ "conslist_opt ::= COMMA conslist",

 /*  90 */ "conslist ::= conslist COMMA tcons",
 /*  91 */ "conslist ::= conslist tcons",
 /*  92 */ "conslist ::= tcons",
 /*  93 */ "tcons ::= CONSTRAINT nm",
 /*  94 */ "tcons ::= PRIMARY KEY LP idxlist autoinc RP onconf",
 /*  95 */ "tcons ::= UNIQUE LP idxlist RP onconf",
 /*  96 */ "tcons ::= CHECK LP expr RP onconf",
 /*  97 */ "tcons ::= FOREIGN KEY LP idxlist RP REFERENCES nm idxlist_opt refargs defer_subclause_opt",
 /*  98 */ "defer_subclause_opt ::=",
 /*  99 */ "defer_subclause_opt ::= defer_subclause",
 /* 100 */ "onconf ::=",
................................................................................
    */
    case 160: /* select */
    case 194: /* oneselect */
{
sqlite3SelectDelete(pParse->db, (yypminor->yy159));
}
      break;
    case 174: /* term */
    case 175: /* expr */
{
sqlite3ExprDelete(pParse->db, (yypminor->yy342).pExpr);
}
      break;
    case 179: /* idxlist_opt */
    case 187: /* idxlist */
    case 197: /* selcollist */
    case 200: /* groupby_opt */
    case 202: /* orderby_opt */
    case 204: /* sclp */
    case 214: /* sortlist */
    case 215: /* nexprlist */
................................................................................
  { 167, 6 },
  { 168, 1 },
  { 168, 2 },
  { 169, 1 },
  { 169, 1 },
  { 164, 2 },
  { 164, 0 },
  { 172, 3 },
  { 172, 1 },
  { 173, 2 },
  { 173, 4 },
  { 173, 3 },
  { 173, 3 },
  { 173, 2 },
  { 173, 2 },
  { 173, 3 },
  { 173, 5 },
  { 173, 2 },
  { 173, 4 },
  { 173, 4 },
  { 173, 1 },
  { 173, 2 },
  { 178, 0 },
  { 178, 1 },
  { 180, 0 },
  { 180, 2 },
  { 182, 2 },
  { 182, 3 },
  { 182, 3 },
  { 182, 3 },
  { 183, 2 },
  { 183, 2 },
  { 183, 1 },
  { 183, 1 },
  { 183, 2 },
  { 181, 3 },
  { 181, 2 },
  { 184, 0 },
  { 184, 2 },
  { 184, 2 },
  { 159, 0 },
  { 159, 2 },

  { 185, 3 },
  { 185, 2 },
  { 185, 1 },
  { 186, 2 },
  { 186, 7 },
  { 186, 5 },
  { 186, 5 },
  { 186, 10 },
  { 188, 0 },
  { 188, 1 },
  { 176, 0 },
  { 176, 3 },
  { 189, 0 },
  { 189, 2 },
  { 190, 1 },
  { 190, 1 },
  { 190, 1 },
  { 147, 4 },
  { 192, 2 },
................................................................................
  { 209, 2 },
  { 211, 4 },
  { 211, 0 },
  { 202, 0 },
  { 202, 3 },
  { 214, 4 },
  { 214, 2 },
  { 177, 1 },
  { 177, 1 },
  { 177, 0 },
  { 200, 0 },
  { 200, 3 },
  { 201, 0 },
  { 201, 2 },
  { 203, 0 },
  { 203, 2 },
  { 203, 4 },
................................................................................
  { 217, 1 },
  { 219, 4 },
  { 219, 5 },
  { 218, 0 },
  { 218, 3 },
  { 213, 3 },
  { 213, 1 },
  { 175, 1 },
  { 175, 3 },
  { 174, 1 },
  { 175, 1 },
  { 175, 1 },
  { 175, 3 },
  { 175, 5 },
  { 174, 1 },
  { 174, 1 },
  { 175, 1 },
  { 175, 1 },
  { 175, 3 },
  { 175, 6 },
  { 175, 5 },
  { 175, 4 },
  { 174, 1 },
  { 175, 3 },
  { 175, 3 },
  { 175, 3 },
  { 175, 3 },
  { 175, 3 },
  { 175, 3 },
  { 175, 3 },
  { 175, 3 },
  { 221, 1 },
  { 221, 2 },
  { 221, 1 },
  { 221, 2 },
  { 175, 3 },
  { 175, 5 },
  { 175, 2 },
  { 175, 3 },
  { 175, 3 },
  { 175, 4 },
  { 175, 2 },
  { 175, 2 },
  { 175, 2 },
  { 175, 2 },
  { 222, 1 },
  { 222, 2 },
  { 175, 5 },
  { 223, 1 },
  { 223, 2 },
  { 175, 5 },
  { 175, 3 },
  { 175, 5 },
  { 175, 4 },
  { 175, 4 },
  { 175, 5 },
  { 225, 5 },
  { 225, 4 },
  { 226, 2 },
  { 226, 0 },
  { 224, 1 },
  { 224, 0 },
  { 220, 1 },
  { 220, 0 },
  { 215, 3 },
  { 215, 1 },
  { 147, 11 },
  { 227, 1 },
  { 227, 0 },
  { 179, 0 },
  { 179, 3 },
  { 187, 5 },
  { 187, 3 },
  { 228, 0 },
  { 228, 2 },
  { 147, 4 },
  { 147, 1 },
  { 147, 2 },
................................................................................
  { 239, 3 },
  { 239, 2 },
  { 237, 7 },
  { 237, 5 },
  { 237, 5 },
  { 237, 5 },
  { 237, 1 },
  { 175, 4 },
  { 175, 6 },
  { 191, 1 },
  { 191, 1 },
  { 191, 1 },
  { 147, 4 },
  { 147, 6 },
  { 147, 3 },
  { 241, 0 },
................................................................................
{
  pParse->db->lookaside.bEnabled = 0;
  yygotominor.yy0 = yymsp[0].minor.yy0;
}
        break;
      case 28: /* ifnotexists ::= */
      case 31: /* temp ::= */ yytestcase(yyruleno==31);
      case 70: /* autoinc ::= */ yytestcase(yyruleno==70);
      case 83: /* defer_subclause ::= NOT DEFERRABLE init_deferred_pred_opt */ yytestcase(yyruleno==83);
      case 85: /* init_deferred_pred_opt ::= */ yytestcase(yyruleno==85);
      case 87: /* init_deferred_pred_opt ::= INITIALLY IMMEDIATE */ yytestcase(yyruleno==87);
      case 98: /* defer_subclause_opt ::= */ yytestcase(yyruleno==98);
      case 109: /* ifexists ::= */ yytestcase(yyruleno==109);
      case 120: /* distinct ::= ALL */ yytestcase(yyruleno==120);
      case 121: /* distinct ::= */ yytestcase(yyruleno==121);
      case 221: /* between_op ::= BETWEEN */ yytestcase(yyruleno==221);
      case 224: /* in_op ::= IN */ yytestcase(yyruleno==224);
{yygotominor.yy392 = 0;}
        break;
      case 29: /* ifnotexists ::= IF NOT EXISTS */
      case 30: /* temp ::= TEMP */ yytestcase(yyruleno==30);
      case 71: /* autoinc ::= AUTOINCR */ yytestcase(yyruleno==71);
      case 86: /* init_deferred_pred_opt ::= INITIALLY DEFERRED */ yytestcase(yyruleno==86);
      case 108: /* ifexists ::= IF EXISTS */ yytestcase(yyruleno==108);
      case 119: /* distinct ::= DISTINCT */ yytestcase(yyruleno==119);
      case 222: /* between_op ::= NOT BETWEEN */ yytestcase(yyruleno==222);
      case 225: /* in_op ::= NOT IN */ yytestcase(yyruleno==225);
{yygotominor.yy392 = 1;}
        break;
      case 32: /* create_table_args ::= LP columnlist conslist_opt RP */
................................................................................
  yygotominor.yy0.n = (int)(pParse->sLastToken.z-yymsp[-2].minor.yy0.z) + pParse->sLastToken.n;
}
        break;
      case 37: /* columnid ::= nm */
{
  sqlite3AddColumn(pParse,&yymsp[0].minor.yy0);
  yygotominor.yy0 = yymsp[0].minor.yy0;

}
        break;
      case 38: /* id ::= ID */
      case 39: /* id ::= INDEXED */ yytestcase(yyruleno==39);
      case 40: /* ids ::= ID|STRING */ yytestcase(yyruleno==40);
      case 41: /* nm ::= id */ yytestcase(yyruleno==41);
      case 42: /* nm ::= STRING */ yytestcase(yyruleno==42);
................................................................................
  yygotominor.yy0.z = yymsp[-5].minor.yy0.z;
  yygotominor.yy0.n = (int)(&yymsp[0].minor.yy0.z[yymsp[0].minor.yy0.n] - yymsp[-5].minor.yy0.z);
}
        break;
      case 50: /* typename ::= typename ids */
{yygotominor.yy0.z=yymsp[-1].minor.yy0.z; yygotominor.yy0.n=yymsp[0].minor.yy0.n+(int)(yymsp[0].minor.yy0.z-yymsp[-1].minor.yy0.z);}
        break;




      case 57: /* ccons ::= DEFAULT term */
      case 59: /* ccons ::= DEFAULT PLUS term */ yytestcase(yyruleno==59);
{sqlite3AddDefaultValue(pParse,&yymsp[0].minor.yy342);}
        break;
      case 58: /* ccons ::= DEFAULT LP expr RP */
{sqlite3AddDefaultValue(pParse,&yymsp[-1].minor.yy342);}
        break;
      case 60: /* ccons ::= DEFAULT MINUS term */
{
  ExprSpan v;
  v.pExpr = sqlite3PExpr(pParse, TK_UMINUS, yymsp[0].minor.yy342.pExpr, 0, 0);
  v.zStart = yymsp[-1].minor.yy0.z;
  v.zEnd = yymsp[0].minor.yy342.zEnd;
  sqlite3AddDefaultValue(pParse,&v);
}
        break;
      case 61: /* ccons ::= DEFAULT id */
{
  ExprSpan v;
  spanExpr(&v, pParse, TK_STRING, &yymsp[0].minor.yy0);
  sqlite3AddDefaultValue(pParse,&v);
}
        break;
      case 63: /* ccons ::= NOT NULL onconf */
{sqlite3AddNotNull(pParse, yymsp[0].minor.yy392);}
        break;
      case 64: /* ccons ::= PRIMARY KEY sortorder onconf autoinc */
{sqlite3AddPrimaryKey(pParse,0,yymsp[-1].minor.yy392,yymsp[0].minor.yy392,yymsp[-2].minor.yy392);}
        break;
      case 65: /* ccons ::= UNIQUE onconf */
{sqlite3CreateIndex(pParse,0,0,0,0,yymsp[0].minor.yy392,0,0,0,0);}
        break;
      case 66: /* ccons ::= CHECK LP expr RP */
{sqlite3AddCheckConstraint(pParse,yymsp[-1].minor.yy342.pExpr);}
        break;
      case 67: /* ccons ::= REFERENCES nm idxlist_opt refargs */
{sqlite3CreateForeignKey(pParse,0,&yymsp[-2].minor.yy0,yymsp[-1].minor.yy442,yymsp[0].minor.yy392);}
        break;
      case 68: /* ccons ::= defer_subclause */
{sqlite3DeferForeignKey(pParse,yymsp[0].minor.yy392);}
        break;
      case 69: /* ccons ::= COLLATE ids */
{sqlite3AddCollateType(pParse, &yymsp[0].minor.yy0);}
        break;
      case 72: /* refargs ::= */
{ yygotominor.yy392 = OE_None*0x0101; /* EV: R-19803-45884 */}
        break;
      case 73: /* refargs ::= refargs refarg */
{ yygotominor.yy392 = (yymsp[-1].minor.yy392 & ~yymsp[0].minor.yy207.mask) | yymsp[0].minor.yy207.value; }
        break;
      case 74: /* refarg ::= MATCH nm */
      case 75: /* refarg ::= ON INSERT refact */ yytestcase(yyruleno==75);
{ yygotominor.yy207.value = 0;     yygotominor.yy207.mask = 0x000000; }
        break;
      case 76: /* refarg ::= ON DELETE refact */
{ yygotominor.yy207.value = yymsp[0].minor.yy392;     yygotominor.yy207.mask = 0x0000ff; }
        break;
      case 77: /* refarg ::= ON UPDATE refact */
{ yygotominor.yy207.value = yymsp[0].minor.yy392<<8;  yygotominor.yy207.mask = 0x00ff00; }
        break;
      case 78: /* refact ::= SET NULL */
{ yygotominor.yy392 = OE_SetNull;  /* EV: R-33326-45252 */}
        break;
      case 79: /* refact ::= SET DEFAULT */
{ yygotominor.yy392 = OE_SetDflt;  /* EV: R-33326-45252 */}
        break;
      case 80: /* refact ::= CASCADE */
{ yygotominor.yy392 = OE_Cascade;  /* EV: R-33326-45252 */}
        break;
      case 81: /* refact ::= RESTRICT */
{ yygotominor.yy392 = OE_Restrict; /* EV: R-33326-45252 */}
        break;
      case 82: /* refact ::= NO ACTION */
{ yygotominor.yy392 = OE_None;     /* EV: R-33326-45252 */}
        break;
      case 84: /* defer_subclause ::= DEFERRABLE init_deferred_pred_opt */
      case 99: /* defer_subclause_opt ::= defer_subclause */ yytestcase(yyruleno==99);
      case 101: /* onconf ::= ON CONFLICT resolvetype */ yytestcase(yyruleno==101);
      case 104: /* resolvetype ::= raisetype */ yytestcase(yyruleno==104);
{yygotominor.yy392 = yymsp[0].minor.yy392;}
        break;
      case 88: /* conslist_opt ::= */
{yygotominor.yy0.n = 0; yygotominor.yy0.z = 0;}
        break;
      case 89: /* conslist_opt ::= COMMA conslist */
{yygotominor.yy0 = yymsp[-1].minor.yy0;}



        break;
      case 94: /* tcons ::= PRIMARY KEY LP idxlist autoinc RP onconf */
{sqlite3AddPrimaryKey(pParse,yymsp[-3].minor.yy442,yymsp[0].minor.yy392,yymsp[-2].minor.yy392,0);}
        break;
      case 95: /* tcons ::= UNIQUE LP idxlist RP onconf */
{sqlite3CreateIndex(pParse,0,0,0,yymsp[-2].minor.yy442,yymsp[0].minor.yy392,0,0,0,0);}
        break;
................................................................................
      case 204: /* expr ::= expr PLUS|MINUS expr */ yytestcase(yyruleno==204);
      case 205: /* expr ::= expr STAR|SLASH|REM expr */ yytestcase(yyruleno==205);
      case 206: /* expr ::= expr CONCAT expr */ yytestcase(yyruleno==206);
{spanBinaryExpr(&yygotominor.yy342,pParse,yymsp[-1].major,&yymsp[-2].minor.yy342,&yymsp[0].minor.yy342);}
        break;
      case 207: /* likeop ::= LIKE_KW */
      case 209: /* likeop ::= MATCH */ yytestcase(yyruleno==209);
{yygotominor.yy318.eOperator = yymsp[0].minor.yy0; yygotominor.yy318.not = 0;}
        break;
      case 208: /* likeop ::= NOT LIKE_KW */
      case 210: /* likeop ::= NOT MATCH */ yytestcase(yyruleno==210);
{yygotominor.yy318.eOperator = yymsp[0].minor.yy0; yygotominor.yy318.not = 1;}
        break;
      case 211: /* expr ::= expr likeop expr */
{
  ExprList *pList;
  pList = sqlite3ExprListAppend(pParse,0, yymsp[0].minor.yy342.pExpr);
  pList = sqlite3ExprListAppend(pParse,pList, yymsp[-2].minor.yy342.pExpr);
  yygotominor.yy342.pExpr = sqlite3ExprFunction(pParse, pList, &yymsp[-1].minor.yy318.eOperator);
  if( yymsp[-1].minor.yy318.not ) yygotominor.yy342.pExpr = sqlite3PExpr(pParse, TK_NOT, yygotominor.yy342.pExpr, 0, 0);
  yygotominor.yy342.zStart = yymsp[-2].minor.yy342.zStart;
  yygotominor.yy342.zEnd = yymsp[0].minor.yy342.zEnd;
  if( yygotominor.yy342.pExpr ) yygotominor.yy342.pExpr->flags |= EP_InfixFunc;
}
        break;
      case 212: /* expr ::= expr likeop expr ESCAPE expr */
{
  ExprList *pList;
  pList = sqlite3ExprListAppend(pParse,0, yymsp[-2].minor.yy342.pExpr);
  pList = sqlite3ExprListAppend(pParse,pList, yymsp[-4].minor.yy342.pExpr);
  pList = sqlite3ExprListAppend(pParse,pList, yymsp[0].minor.yy342.pExpr);
  yygotominor.yy342.pExpr = sqlite3ExprFunction(pParse, pList, &yymsp[-3].minor.yy318.eOperator);
  if( yymsp[-3].minor.yy318.not ) yygotominor.yy342.pExpr = sqlite3PExpr(pParse, TK_NOT, yygotominor.yy342.pExpr, 0, 0);
  yygotominor.yy342.zStart = yymsp[-4].minor.yy342.zStart;
  yygotominor.yy342.zEnd = yymsp[0].minor.yy342.zEnd;
  if( yygotominor.yy342.pExpr ) yygotominor.yy342.pExpr->flags |= EP_InfixFunc;
}
        break;
      case 213: /* expr ::= expr ISNULL|NOTNULL */
{spanUnaryPostfix(&yygotominor.yy342,pParse,yymsp[0].major,&yymsp[-1].minor.yy342,&yymsp[0].minor.yy0);}
................................................................................
      /* (21) savepoint_opt ::= */ yytestcase(yyruleno==21);
      /* (25) cmd ::= create_table create_table_args */ yytestcase(yyruleno==25);
      /* (34) columnlist ::= columnlist COMMA column */ yytestcase(yyruleno==34);
      /* (35) columnlist ::= column */ yytestcase(yyruleno==35);
      /* (44) type ::= */ yytestcase(yyruleno==44);
      /* (51) signed ::= plus_num */ yytestcase(yyruleno==51);
      /* (52) signed ::= minus_num */ yytestcase(yyruleno==52);
      /* (53) carglist ::= carglist carg */ yytestcase(yyruleno==53);
      /* (54) carglist ::= */ yytestcase(yyruleno==54);
      /* (55) carg ::= CONSTRAINT nm ccons */ yytestcase(yyruleno==55);
      /* (56) carg ::= ccons */ yytestcase(yyruleno==56);
      /* (62) ccons ::= NULL onconf */ yytestcase(yyruleno==62);

      /* (90) conslist ::= conslist COMMA tcons */ yytestcase(yyruleno==90);
      /* (91) conslist ::= conslist tcons */ yytestcase(yyruleno==91);
      /* (92) conslist ::= tcons */ yytestcase(yyruleno==92);
      /* (93) tcons ::= CONSTRAINT nm */ yytestcase(yyruleno==93);
      /* (277) foreach_clause ::= */ yytestcase(yyruleno==277);
      /* (278) foreach_clause ::= FOR EACH ROW */ yytestcase(yyruleno==278);
      /* (285) tridxby ::= */ yytestcase(yyruleno==285);
      /* (303) database_kw_opt ::= DATABASE */ yytestcase(yyruleno==303);
      /* (304) database_kw_opt ::= */ yytestcase(yyruleno==304);
      /* (312) kwcolumn_opt ::= */ yytestcase(yyruleno==312);
      /* (313) kwcolumn_opt ::= COLUMNKW */ yytestcase(yyruleno==313);
................................................................................
**
** FTS3 used to optionally store character offsets using a compile-time
** option.  But that functionality is no longer supported.
**
** A doclist is stored like this:
**
** array {
**   varint docid;
**   array {                (position list for column 0)
**     varint position;     (2 more than the delta from previous position)
**   }
**   array {
**     varint POS_COLUMN;   (marks start of position list for new column)
**     varint column;       (index of new column)
**     array {
................................................................................
**   value:     123 5 9 1 1 14 35 0 234 72 0
**
** The 123 value is the first docid.  For column zero in this document
** there are two matches at positions 3 and 10 (5-2 and 9-2+3).  The 1
** at D signals the start of a new column; the 1 at E indicates that the
** new column is column number 1.  There are two positions at 12 and 45
** (14-2 and 35-2+12).  The 0 at H indicate the end-of-document.  The
** 234 at I is the next docid.  It has one position 72 (72-2) and then
** terminates with the 0 at K.
**
** A "position-list" is the list of positions for multiple columns for
** a single docid.  A "column-list" is the set of positions for a single
** column.  Hence, a position-list consists of one or more column-lists,
** a document record consists of a docid followed by a position-list and
** a doclist consists of one or more document records.
**
................................................................................
*/
#define SizeofArray(X) ((int)(sizeof(X)/sizeof(X[0])))


#ifndef MIN
# define MIN(x,y) ((x)<(y)?(x):(y))
#endif




/*
** Maximum length of a varint encoded integer. The varint format is different
** from that used by SQLite, so the maximum length is 10, not 9.
*/
#define FTS3_VARINT_MAX 10

................................................................................
** false.
*/
#ifdef SQLITE_COVERAGE_TEST
# define ALWAYS(x) (1)
# define NEVER(X)  (0)
#else
# define ALWAYS(x) (x)
# define NEVER(X)  (x)
#endif

/*
** Internal types used by SQLite.
*/
typedef unsigned char u8;         /* 1-byte (or larger) unsigned integer */
typedef short int i16;            /* 2-byte (or larger) signed integer */
typedef unsigned int u32;         /* 4-byte unsigned integer */
typedef sqlite3_uint64 u64;       /* 8-byte unsigned integer */


/*
** Macro used to suppress compiler warnings for unused parameters.
*/
#define UNUSED_PARAMETER(x) (void)(x)

/*
................................................................................
  const char *zDb;                /* logical database name */
  const char *zName;              /* virtual table name */
  int nColumn;                    /* number of named columns in virtual table */
  char **azColumn;                /* column names.  malloced */
  sqlite3_tokenizer *pTokenizer;  /* tokenizer for inserts and queries */
  char *zContentTbl;              /* content=xxx option, or NULL */
  char *zLanguageid;              /* languageid=xxx option, or NULL */



  /* Precompiled statements used by the implementation. Each of these 
  ** statements is run and reset within a single virtual table API call. 
  */
  sqlite3_stmt *aStmt[28];

  char *zReadExprlist;
  char *zWriteExprlist;

  int nNodeSize;                  /* Soft limit for node size */

  u8 bHasStat;                    /* True if %_stat table exists */
  u8 bHasDocsize;                 /* True if %_docsize table exists */
  u8 bDescIdx;                    /* True if doclists are in reverse order */

  int nPgsz;                      /* Page size for host database */
  char *zSegmentsTbl;             /* Name of %_segments table */
  sqlite3_blob *pSegments;        /* Blob handle open on %_segments table */

  /* TODO: Fix the first paragraph of this comment.
  **
  ** The following array of hash tables is used to buffer pending index 
  ** updates during transactions. Variable nPendingData estimates the memory 

  ** size of the pending data, including hash table overhead, not including
  ** malloc overhead.  When nPendingData exceeds nMaxPendingData, the buffer 
  ** is flushed automatically. Variable iPrevDocid is the docid of the most 
  ** recently inserted record.
  **
  ** A single FTS4 table may have multiple full-text indexes. For each index
  ** there is an entry in the aIndex[] array. Index 0 is an index of all the
  ** terms that appear in the document set. Each subsequent index in aIndex[]
  ** is an index of prefixes of a specific length.






  */
  int nIndex;                     /* Size of aIndex[] */
  struct Fts3Index {
    int nPrefix;                  /* Prefix length (0 for main terms index) */
    Fts3Hash hPending;            /* Pending terms table for this index */
  } *aIndex;
  int nMaxPendingData;            /* Max pending data before flush to disk */
................................................................................
SQLITE_PRIVATE int sqlite3Fts3SelectDocsize(Fts3Table *, sqlite3_int64, sqlite3_stmt **);

SQLITE_PRIVATE void sqlite3Fts3FreeDeferredTokens(Fts3Cursor *);
SQLITE_PRIVATE int sqlite3Fts3DeferToken(Fts3Cursor *, Fts3PhraseToken *, int);
SQLITE_PRIVATE int sqlite3Fts3CacheDeferredDoclists(Fts3Cursor *);
SQLITE_PRIVATE void sqlite3Fts3FreeDeferredDoclists(Fts3Cursor *);
SQLITE_PRIVATE void sqlite3Fts3SegmentsClose(Fts3Table *);


/* Special values interpreted by sqlite3SegReaderCursor() */
#define FTS3_SEGCURSOR_PENDING        -1
#define FTS3_SEGCURSOR_ALL            -2

SQLITE_PRIVATE int sqlite3Fts3SegReaderStart(Fts3Table*, Fts3MultiSegReader*, Fts3SegFilter*);
SQLITE_PRIVATE int sqlite3Fts3SegReaderStep(Fts3Table *, Fts3MultiSegReader *);
................................................................................
  /* Output values. Valid only after Fts3SegReaderStep() returns SQLITE_ROW. */
  char *zTerm;                    /* Pointer to term buffer */
  int nTerm;                      /* Size of zTerm in bytes */
  char *aDoclist;                 /* Pointer to doclist buffer */
  int nDoclist;                   /* Size of aDoclist[] in bytes */
};



/* fts3.c */
SQLITE_PRIVATE int sqlite3Fts3PutVarint(char *, sqlite3_int64);
SQLITE_PRIVATE int sqlite3Fts3GetVarint(const char *, sqlite_int64 *);
SQLITE_PRIVATE int sqlite3Fts3GetVarint32(const char *, int *);
SQLITE_PRIVATE int sqlite3Fts3VarintLen(sqlite3_uint64);
SQLITE_PRIVATE void sqlite3Fts3Dequote(char *);
SQLITE_PRIVATE void sqlite3Fts3DoclistPrev(int,char*,int,char**,sqlite3_int64*,int*,u8*);
SQLITE_PRIVATE int sqlite3Fts3EvalPhraseStats(Fts3Cursor *, Fts3Expr *, u32 *);
SQLITE_PRIVATE int sqlite3Fts3FirstFilter(sqlite3_int64, char *, int, char *);


/* fts3_tokenizer.c */
SQLITE_PRIVATE const char *sqlite3Fts3NextToken(const char *, int *);
SQLITE_PRIVATE int sqlite3Fts3InitHashTable(sqlite3 *, Fts3Hash *, const char *);
SQLITE_PRIVATE int sqlite3Fts3InitTokenizer(Fts3Hash *pHash, const char *, 
    sqlite3_tokenizer **, char **
);
................................................................................

SQLITE_PRIVATE void sqlite3Fts3EvalPhraseCleanup(Fts3Phrase *);

SQLITE_PRIVATE int sqlite3Fts3MsrIncrStart(
    Fts3Table*, Fts3MultiSegReader*, int, const char*, int);
SQLITE_PRIVATE int sqlite3Fts3MsrIncrNext(
    Fts3Table *, Fts3MultiSegReader *, sqlite3_int64 *, char **, int *);
SQLITE_PRIVATE char *sqlite3Fts3EvalPhrasePoslist(Fts3Cursor *, Fts3Expr *, int iCol); 
SQLITE_PRIVATE int sqlite3Fts3MsrOvfl(Fts3Cursor *, Fts3MultiSegReader *, int *);
SQLITE_PRIVATE int sqlite3Fts3MsrIncrRestart(Fts3MultiSegReader *pCsr);

SQLITE_PRIVATE int sqlite3Fts3DeferredTokenList(Fts3DeferredToken *, char **, int *);

#endif /* !SQLITE_CORE || SQLITE_ENABLE_FTS3 */
#endif /* _FTSINT_H */
................................................................................
    }

    sqlite3_free(zSql);
    sqlite3_free(zCols);
    *pRc = rc;
  }
}













/*
** Create the backing store tables (%_content, %_segments and %_segdir)
** required by the FTS3 table passed as the only argument. This is done
** as part of the vtab xCreate() method.
**
** If the p->bHasDocsize boolean is true (indicating that this is an
................................................................................
  );
  if( p->bHasDocsize ){
    fts3DbExec(&rc, db, 
        "CREATE TABLE %Q.'%q_docsize'(docid INTEGER PRIMARY KEY, size BLOB);",
        p->zDb, p->zName
    );
  }

  if( p->bHasStat ){
    fts3DbExec(&rc, db, 
        "CREATE TABLE %Q.'%q_stat'(id INTEGER PRIMARY KEY, value BLOB);",
        p->zDb, p->zName
    );
  }
  return rc;
}

/*
** Store the current database page-size in bytes in p->nPgsz.
**
................................................................................
  p->nColumn = nCol;
  p->nPendingData = 0;
  p->azColumn = (char **)&p[1];
  p->pTokenizer = pTokenizer;
  p->nMaxPendingData = FTS3_MAX_PENDING_DATA;
  p->bHasDocsize = (isFts4 && bNoDocsize==0);
  p->bHasStat = isFts4;

  p->bDescIdx = bDescIdx;

  p->zContentTbl = zContent;
  p->zLanguageid = zLanguageid;
  zContent = 0;
  zLanguageid = 0;
  TESTONLY( p->inTransaction = -1 );
  TESTONLY( p->mxSavepoint = -1 );

................................................................................

  /* If this is an xCreate call, create the underlying tables in the 
  ** database. TODO: For xConnect(), it could verify that said tables exist.
  */
  if( isCreate ){
    rc = fts3CreateTables(p);
  }











  /* Figure out the page-size for the database. This is required in order to
  ** estimate the cost of loading large doclists from the database.  */
  fts3DatabasePageSize(&rc, p);
  p->nNodeSize = p->nPgsz-35;

  /* Declare the table schema to SQLite. */
................................................................................

/*
** Set up a cursor object for iterating through a full-text index or a 
** single level therein.
*/
SQLITE_PRIVATE int sqlite3Fts3SegReaderCursor(
  Fts3Table *p,                   /* FTS3 table handle */
  int iLangid,
  int iIndex,                     /* Index to search (from 0 to p->nIndex-1) */
  int iLevel,                     /* Level of segments to scan */
  const char *zTerm,              /* Term to query for */
  int nTerm,                      /* Size of zTerm in bytes */
  int isPrefix,                   /* True for a prefix search */
  int isScan,                     /* True to scan from zTerm to EOF */
  Fts3MultiSegReader *pCsr       /* Cursor object to populate */
................................................................................
      ||  iLevel==FTS3_SEGCURSOR_PENDING 
      ||  iLevel>=0
  );
  assert( iLevel<FTS3_SEGDIR_MAXLEVEL );
  assert( FTS3_SEGCURSOR_ALL<0 && FTS3_SEGCURSOR_PENDING<0 );
  assert( isPrefix==0 || isScan==0 );

  /* "isScan" is only set to true by the ft4aux module, an ordinary
  ** full-text tables. */
  assert( isScan==0 || p->aIndex==0 );

  memset(pCsr, 0, sizeof(Fts3MultiSegReader));

  return fts3SegReaderCursor(
      p, iLangid, iIndex, iLevel, zTerm, nTerm, isPrefix, isScan, pCsr
  );
}

/*
** In addition to its current configuration, have the Fts3MultiSegReader
................................................................................
      return SQLITE_NOMEM;
    }

    pCsr->iLangid = 0;
    if( nVal==2 ) pCsr->iLangid = sqlite3_value_int(apVal[1]);

    rc = sqlite3Fts3ExprParse(p->pTokenizer, pCsr->iLangid,
        p->azColumn, p->bHasStat, p->nColumn, iCol, zQuery, -1, &pCsr->pExpr
    );
    if( rc!=SQLITE_OK ){
      if( rc==SQLITE_ERROR ){
        static const char *zErr = "malformed MATCH expression: [%s]";
        p->base.zErrMsg = sqlite3_mprintf(zErr, zQuery);
      }
      return rc;
................................................................................
}

/*
** Implementation of xSync() method. Flush the contents of the pending-terms
** hash-table to the database.
*/
static int fts3SyncMethod(sqlite3_vtab *pVtab){























  int rc = sqlite3Fts3PendingTermsFlush((Fts3Table *)pVtab);











  sqlite3Fts3SegmentsClose((Fts3Table *)pVtab);
  return rc;
}

/*
** Implementation of xBegin() method. This is a no-op.
*/
static int fts3BeginMethod(sqlite3_vtab *pVtab){
  TESTONLY( Fts3Table *p = (Fts3Table*)pVtab );
  UNUSED_PARAMETER(pVtab);
  assert( p->pSegments==0 );
  assert( p->nPendingData==0 );
  assert( p->inTransaction!=1 );
  TESTONLY( p->inTransaction = 1 );
  TESTONLY( p->mxSavepoint = -1; );

  return SQLITE_OK;
}

/*
** Implementation of xCommit() method. This is a no-op. The contents of
** the pending-terms hash-table have already been flushed into the database
** by fts3SyncMethod().
................................................................................

/*
** The xSavepoint() method.
**
** Flush the contents of the pending-terms table to disk.
*/
static int fts3SavepointMethod(sqlite3_vtab *pVtab, int iSavepoint){

  UNUSED_PARAMETER(iSavepoint);
  assert( ((Fts3Table *)pVtab)->inTransaction );
  assert( ((Fts3Table *)pVtab)->mxSavepoint < iSavepoint );
  TESTONLY( ((Fts3Table *)pVtab)->mxSavepoint = iSavepoint );

  return fts3SyncMethod(pVtab);


}

/*
** The xRelease() method.
**
** This is a no-op.
*/
................................................................................
*/
SQLITE_PRIVATE void sqlite3Fts3DoclistPrev(
  int bDescIdx,                   /* True if the doclist is desc */
  char *aDoclist,                 /* Pointer to entire doclist */
  int nDoclist,                   /* Length of aDoclist in bytes */
  char **ppIter,                  /* IN/OUT: Iterator pointer */
  sqlite3_int64 *piDocid,         /* IN/OUT: Docid pointer */
  int *pnList,                    /* IN/OUT: List length pointer */
  u8 *pbEof                       /* OUT: End-of-file flag */
){
  char *p = *ppIter;

  assert( nDoclist>0 );
  assert( *pbEof==0 );
  assert( p || *piDocid==0 );
................................................................................
      char *pSave = p;
      fts3ReversePoslist(aDoclist, &p);
      *pnList = (int)(pSave - p);
    }
    *ppIter = p;
  }
}




































/*
** Attempt to move the phrase iterator to point to the next matching docid. 
** If an error occurs, return an SQLite error code. Otherwise, return 
** SQLITE_OK.
**
** If there is no "next" entry and no error occurs, then *pbEof is set to
................................................................................
  int nToken = 0;
  int nOr = 0;

  /* Allocate a MultiSegReader for each token in the expression. */
  fts3EvalAllocateReaders(pCsr, pCsr->pExpr, &nToken, &nOr, &rc);

  /* Determine which, if any, tokens in the expression should be deferred. */
  if( rc==SQLITE_OK && nToken>1 && pTab->bHasStat ){
    Fts3TokenAndCost *aTC;
    Fts3Expr **apOr;
    aTC = (Fts3TokenAndCost *)sqlite3_malloc(
        sizeof(Fts3TokenAndCost) * nToken
      + sizeof(Fts3Expr *) * nOr * 2
    );
    apOr = (Fts3Expr **)&aTC[nToken];
................................................................................
** for 'X' is requested, the buffer returned may contain:
**
**     0x04 0x05 0x03 0x01   or   0x04 0x05 0x03 0x00
**
** This function works regardless of whether or not the phrase is deferred,
** incremental, or neither.
*/
SQLITE_PRIVATE char *sqlite3Fts3EvalPhrasePoslist(
  Fts3Cursor *pCsr,               /* FTS3 cursor object */
  Fts3Expr *pExpr,                /* Phrase to return doclist for */
  int iCol                        /* Column to return position list for */

){
  Fts3Phrase *pPhrase = pExpr->pPhrase;
  Fts3Table *pTab = (Fts3Table *)pCsr->base.pVtab;
  char *pIter = pPhrase->doclist.pList;
  int iThis;





  assert( iCol>=0 && iCol<pTab->nColumn );
  if( !pIter 
   || pExpr->bEof 
   || pExpr->iDocid!=pCsr->iPrevId
   || (pPhrase->iColumn<pTab->nColumn && pPhrase->iColumn!=iCol) 
  ){
    return 0;
  }





































  assert( pPhrase->doclist.nList>0 );
























  if( *pIter==0x01 ){
    pIter++;
    pIter += sqlite3Fts3GetVarint32(pIter, &iThis);
  }else{
    iThis = 0;
  }
  while( iThis<iCol ){
    fts3ColumnlistCopy(0, &pIter);
    if( *pIter==0x00 ) return 0;
    pIter++;
    pIter += sqlite3Fts3GetVarint32(pIter, &iThis);
  }

  return ((iCol==iThis)?pIter:0);

}

/*
** Free all components of the Fts3Phrase structure that were allocated by
** the eval module. Specifically, this means to free:
**
**   * the contents of pPhrase->doclist, and
................................................................................
    memset(&pPhrase->doclist, 0, sizeof(Fts3Doclist));
    for(i=0; i<pPhrase->nToken; i++){
      fts3SegReaderCursorFree(pPhrase->aToken[i].pSegcsr);
      pPhrase->aToken[i].pSegcsr = 0;
    }
  }
}


/*
** Return SQLITE_CORRUPT_VTAB.
*/
#ifdef SQLITE_DEBUG
SQLITE_PRIVATE int sqlite3Fts3Corrupt(){
  return SQLITE_CORRUPT_VTAB;
................................................................................

#if !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_FTS3)

/* #include <string.h> */
/* #include <assert.h> */
/* #include <stdlib.h> */




/*
** When full-text index nodes are loaded from disk, the buffer that they
** are loaded into has the following number of bytes of padding at the end 
** of it. i.e. if a full-text index node is 900 bytes in size, then a buffer
** of 920 bytes is allocated for it.
**
** This means that if we have a pointer into a buffer containing node data,
................................................................................
int test_fts3_node_chunk_threshold = (4*1024)*4;
# define FTS3_NODE_CHUNKSIZE       test_fts3_node_chunksize
# define FTS3_NODE_CHUNK_THRESHOLD test_fts3_node_chunk_threshold
#else
# define FTS3_NODE_CHUNKSIZE (4*1024) 
# define FTS3_NODE_CHUNK_THRESHOLD (FTS3_NODE_CHUNKSIZE*4)
#endif
























typedef struct PendingList PendingList;
typedef struct SegmentNode SegmentNode;
typedef struct SegmentWriter SegmentWriter;

/*
** An instance of the following data structure is used to build doclists
................................................................................
#define SQL_SELECT_SEGDIR_MAX_LEVEL   15
#define SQL_DELETE_SEGDIR_LEVEL       16
#define SQL_DELETE_SEGMENTS_RANGE     17
#define SQL_CONTENT_INSERT            18
#define SQL_DELETE_DOCSIZE            19
#define SQL_REPLACE_DOCSIZE           20
#define SQL_SELECT_DOCSIZE            21
#define SQL_SELECT_DOCTOTAL           22
#define SQL_REPLACE_DOCTOTAL          23

#define SQL_SELECT_ALL_PREFIX_LEVEL   24
#define SQL_DELETE_ALL_TERMS_SEGDIR   25

#define SQL_DELETE_SEGDIR_RANGE       26

#define SQL_SELECT_ALL_LANGID         27










/*
** This function is used to obtain an SQLite prepared statement handle
** for the statement identified by the second argument. If successful,
** *pp is set to the requested statement handle and SQLITE_OK returned.
** Otherwise, an SQLite error code is returned and *pp is set to 0.
**
................................................................................
/* 2  */  "DELETE FROM %Q.'%q_content'",
/* 3  */  "DELETE FROM %Q.'%q_segments'",
/* 4  */  "DELETE FROM %Q.'%q_segdir'",
/* 5  */  "DELETE FROM %Q.'%q_docsize'",
/* 6  */  "DELETE FROM %Q.'%q_stat'",
/* 7  */  "SELECT %s WHERE rowid=?",
/* 8  */  "SELECT (SELECT max(idx) FROM %Q.'%q_segdir' WHERE level = ?) + 1",
/* 9  */  "INSERT INTO %Q.'%q_segments'(blockid, block) VALUES(?, ?)",
/* 10 */  "SELECT coalesce((SELECT max(blockid) FROM %Q.'%q_segments') + 1, 1)",
/* 11 */  "INSERT INTO %Q.'%q_segdir' VALUES(?,?,?,?,?,?)",

          /* Return segments in order from oldest to newest.*/ 
/* 12 */  "SELECT idx, start_block, leaves_end_block, end_block, root "
            "FROM %Q.'%q_segdir' WHERE level = ? ORDER BY idx ASC",
/* 13 */  "SELECT idx, start_block, leaves_end_block, end_block, root "
            "FROM %Q.'%q_segdir' WHERE level BETWEEN ? AND ?"
            "ORDER BY level DESC, idx ASC",
................................................................................

/* 16 */  "DELETE FROM %Q.'%q_segdir' WHERE level = ?",
/* 17 */  "DELETE FROM %Q.'%q_segments' WHERE blockid BETWEEN ? AND ?",
/* 18 */  "INSERT INTO %Q.'%q_content' VALUES(%s)",
/* 19 */  "DELETE FROM %Q.'%q_docsize' WHERE docid = ?",
/* 20 */  "REPLACE INTO %Q.'%q_docsize' VALUES(?,?)",
/* 21 */  "SELECT size FROM %Q.'%q_docsize' WHERE docid=?",
/* 22 */  "SELECT value FROM %Q.'%q_stat' WHERE id=0",
/* 23 */  "REPLACE INTO %Q.'%q_stat' VALUES(0,?)",
/* 24 */  "",
/* 25 */  "",

/* 26 */ "DELETE FROM %Q.'%q_segdir' WHERE level BETWEEN ? AND ?",
/* 27 */ "SELECT DISTINCT level / (1024 * ?) FROM %Q.'%q_segdir'",
















































  };
  int rc = SQLITE_OK;
  sqlite3_stmt *pStmt;

  assert( SizeofArray(azSql)==SizeofArray(p->aStmt) );
  assert( eStmt<SizeofArray(azSql) && eStmt>=0 );
  
................................................................................
    for(i=0; rc==SQLITE_OK && i<nParam; i++){
      rc = sqlite3_bind_value(pStmt, i+1, apVal[i]);
    }
  }
  *pp = pStmt;
  return rc;
}


static int fts3SelectDocsize(
  Fts3Table *pTab,                /* FTS3 table handle */
  int eStmt,                      /* Either SQL_SELECT_DOCSIZE or DOCTOTAL */
  sqlite3_int64 iDocid,           /* Docid to bind for SQL_SELECT_DOCSIZE */
  sqlite3_stmt **ppStmt           /* OUT: Statement handle */
){
  sqlite3_stmt *pStmt = 0;        /* Statement requested from fts3SqlStmt() */
  int rc;                         /* Return code */

  assert( eStmt==SQL_SELECT_DOCSIZE || eStmt==SQL_SELECT_DOCTOTAL );

  rc = fts3SqlStmt(pTab, eStmt, &pStmt, 0);
  if( rc==SQLITE_OK ){
    if( eStmt==SQL_SELECT_DOCSIZE ){
      sqlite3_bind_int64(pStmt, 1, iDocid);
    }
    rc = sqlite3_step(pStmt);
    if( rc!=SQLITE_ROW || sqlite3_column_type(pStmt, 0)!=SQLITE_BLOB ){
      rc = sqlite3_reset(pStmt);
      if( rc==SQLITE_OK ) rc = FTS_CORRUPT_VTAB;
      pStmt = 0;
    }else{
      rc = SQLITE_OK;
................................................................................
  return rc;
}

SQLITE_PRIVATE int sqlite3Fts3SelectDoctotal(
  Fts3Table *pTab,                /* Fts3 table handle */
  sqlite3_stmt **ppStmt           /* OUT: Statement handle */
){
  return fts3SelectDocsize(pTab, SQL_SELECT_DOCTOTAL, 0, ppStmt);














}

SQLITE_PRIVATE int sqlite3Fts3SelectDocsize(
  Fts3Table *pTab,                /* Fts3 table handle */
  sqlite3_int64 iDocid,           /* Docid to read size data for */
  sqlite3_stmt **ppStmt           /* OUT: Statement handle */
){
  return fts3SelectDocsize(pTab, SQL_SELECT_DOCSIZE, iDocid, ppStmt);
}

/*
** Similar to fts3SqlStmt(). Except, after binding the parameters in
** array apVal[] to the SQL statement identified by eStmt, the statement
** is executed.
**
................................................................................
** Language 1 indexes are allocated immediately following language 0.
**
** So, for a system with nPrefix prefix indexes configured, the block of
** absolute levels that corresponds to language-id iLangid and index 
** iIndex starts at absolute level ((iLangid * (nPrefix+1) + iIndex) * 1024).
*/
static sqlite3_int64 getAbsoluteLevel(
  Fts3Table *p, 
  int iLangid, 
  int iIndex, 
  int iLevel
){
  sqlite3_int64 iBase;            /* First absolute level for iLangid/iIndex */
  assert( iLangid>=0 );
  assert( p->nIndex>0 );
  assert( iIndex>=0 && iIndex<p->nIndex );

  iBase = ((sqlite3_int64)iLangid * p->nIndex + iIndex) * FTS3_SEGDIR_MAXLEVEL;
  return iBase + iLevel;
}


/*
** Set *ppStmt to a statement handle that may be used to iterate through
** all rows in the %_segdir table, from oldest to newest. If successful,
** return SQLITE_OK. If an error occurs while preparing the statement, 
** return an SQLite error code.
**
................................................................................
  if( rc==SQLITE_OK ){
    /* If iNext is FTS3_MERGE_COUNT, indicating that level iLevel is already
    ** full, merge all segments in level iLevel into a single iLevel+1
    ** segment and allocate (newly freed) index 0 at level iLevel. Otherwise,
    ** if iNext is less than FTS3_MERGE_COUNT, allocate index iNext.
    */
    if( iNext>=FTS3_MERGE_COUNT ){

      rc = fts3SegmentMerge(p, iLangid, iIndex, iLevel);
      *piIdx = 0;
    }else{
      *piIdx = iNext;
    }
  }

................................................................................
  char **paBlob,                  /* OUT: Blob data in malloc'd buffer */
  int *pnBlob,                    /* OUT: Size of blob data */
  int *pnLoad                     /* OUT: Bytes actually loaded */
){
  int rc;                         /* Return code */

  /* pnBlob must be non-NULL. paBlob may be NULL or non-NULL. */
  assert( pnBlob);

  if( p->pSegments ){
    rc = sqlite3_blob_reopen(p->pSegments, iBlockid);
  }else{
    if( 0==p->zSegmentsTbl ){
      p->zSegmentsTbl = sqlite3_mprintf("%s_segments", p->zName);
      if( 0==p->zSegmentsTbl ) return SQLITE_NOMEM;
................................................................................
){
  Fts3Table *p = (Fts3Table*)pCsr->base.pVtab;
  int nOvfl = 0;
  int ii;
  int rc = SQLITE_OK;
  int pgsz = p->nPgsz;

  assert( p->bHasStat );
  assert( pgsz>0 );

  for(ii=0; rc==SQLITE_OK && ii<pMsr->nSegment; ii++){
    Fts3SegReader *pReader = pMsr->apSegment[ii];
    if( !fts3SegReaderIsPending(pReader) 
     && !fts3SegReaderIsRootOnly(pReader) 
    ){
................................................................................
    sqlite3_bind_int64(pStmt, 1, iBlock);
    sqlite3_bind_blob(pStmt, 2, z, n, SQLITE_STATIC);
    sqlite3_step(pStmt);
    rc = sqlite3_reset(pStmt);
  }
  return rc;
}






















/* 
** Insert a record into the %_segdir table.
*/
static int fts3WriteSegdir(
  Fts3Table *p,                   /* Virtual table handle */
  sqlite3_int64 iLevel,           /* Value for "level" field (absolute level) */
................................................................................

  if( nData>0 && nData+nReq>p->nNodeSize ){
    int rc;

    /* The current leaf node is full. Write it out to the database. */
    rc = fts3WriteSegment(p, pWriter->iFree++, pWriter->aData, nData);
    if( rc!=SQLITE_OK ) return rc;


    /* Add the current term to the interior node tree. The term added to
    ** the interior tree must:
    **
    **   a) be greater than the largest term on the leaf node just written
    **      to the database (still available in pWriter->zTerm), and
    **
................................................................................
          p, iLevel, iIdx, pWriter->iFirst, iLastLeaf, iLast, zRoot, nRoot);
    }
  }else{
    /* The entire tree fits on the root node. Write it to the segdir table. */
    rc = fts3WriteSegdir(
        p, iLevel, iIdx, 0, 0, 0, pWriter->aData, pWriter->nData);
  }

  return rc;
}

/*
** Release all memory held by the SegmentWriter object passed as the 
** first argument.
*/
................................................................................
      getAbsoluteLevel(p, iLangid, iIndex, FTS3_SEGDIR_MAXLEVEL-1)
  );
  if( SQLITE_ROW==sqlite3_step(pStmt) ){
    *pnMax = sqlite3_column_int64(pStmt, 0);
  }
  return sqlite3_reset(pStmt);
}
























/*
** This function is used after merging multiple segments into a single large
** segment to delete the old, now redundant, segment b-trees. Specifically,
** it:
** 
**   1) Deletes all %_segments entries for the segments associated with 
................................................................................
  Fts3Table *p,                   /* Virtual table handle */
  int iLangid,                    /* Language id */
  int iIndex,                     /* Index for p->aIndex */
  int iLevel,                     /* Level of %_segdir entries to delete */
  Fts3SegReader **apSegment,      /* Array of SegReader objects */
  int nReader                     /* Size of array apSegment */
){
  int rc;                         /* Return Code */
  int i;                          /* Iterator variable */
  sqlite3_stmt *pDelete;          /* SQL statement to delete rows */

  rc = fts3SqlStmt(p, SQL_DELETE_SEGMENTS_RANGE, &pDelete, 0);
  for(i=0; rc==SQLITE_OK && i<nReader; i++){
    Fts3SegReader *pSegment = apSegment[i];
    if( pSegment->iStartBlock ){
      sqlite3_bind_int64(pDelete, 1, pSegment->iStartBlock);
      sqlite3_bind_int64(pDelete, 2, pSegment->iEndBlock);
      sqlite3_step(pDelete);
      rc = sqlite3_reset(pDelete);
    }

  }
  if( rc!=SQLITE_OK ){
    return rc;
  }

  assert( iLevel>=0 || iLevel==FTS3_SEGCURSOR_ALL );
  if( iLevel==FTS3_SEGCURSOR_ALL ){
................................................................................

/* 
** Flush the contents of pendingTerms to level 0 segments.
*/
SQLITE_PRIVATE int sqlite3Fts3PendingTermsFlush(Fts3Table *p){
  int rc = SQLITE_OK;
  int i;

  for(i=0; rc==SQLITE_OK && i<p->nIndex; i++){
    rc = fts3SegmentMerge(p, p->iPrevLangid, i, FTS3_SEGCURSOR_PENDING);
    if( rc==SQLITE_DONE ) rc = SQLITE_OK;
  }
  sqlite3Fts3PendingTermsClear(p);
















  return rc;
}

/*
** Encode N integers as varints into a blob.
*/
static void fts3EncodeIntArray(
................................................................................
  if( *pRC ) return;
  a = sqlite3_malloc( (sizeof(u32)+10)*nStat );
  if( a==0 ){
    *pRC = SQLITE_NOMEM;
    return;
  }
  pBlob = (char*)&a[nStat];
  rc = fts3SqlStmt(p, SQL_SELECT_DOCTOTAL, &pStmt, 0);
  if( rc ){
    sqlite3_free(a);
    *pRC = rc;
    return;
  }

  if( sqlite3_step(pStmt)==SQLITE_ROW ){
    fts3DecodeIntArray(nStat, a,
         sqlite3_column_blob(pStmt, 0),
         sqlite3_column_bytes(pStmt, 0));
  }else{
    memset(a, 0, sizeof(u32)*(nStat) );
  }
................................................................................
      x = 0;
    }else{
      x = x + aSzIns[i] - aSzDel[i];
    }
    a[i+1] = x;
  }
  fts3EncodeIntArray(nStat, a, pBlob, &nBlob);
  rc = fts3SqlStmt(p, SQL_REPLACE_DOCTOTAL, &pStmt, 0);
  if( rc ){
    sqlite3_free(a);
    *pRC = rc;
    return;
  }

  sqlite3_bind_blob(pStmt, 1, pBlob, nBlob, SQLITE_STATIC);
  sqlite3_step(pStmt);
  *pRC = sqlite3_reset(pStmt);
  sqlite3_free(a);
}

/*
** Merge the entire database so that there is one segment for each 
................................................................................
      }else{
        nEntry++;
        for(iCol=0; iCol<=p->nColumn; iCol++){
          aSzIns[iCol] += aSz[iCol];
        }
      }
    }
    if( p->bHasStat ){
      fts3UpdateDocTotals(&rc, p, aSzIns, aSzDel, nEntry);
    }
    sqlite3_free(aSz);

    if( pStmt ){
      int rc2 = sqlite3_finalize(pStmt);
      if( rc==SQLITE_OK ){
................................................................................
      }
    }
  }

  return rc;
}


















































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































/*
** Handle a 'special' INSERT of the form:
**
**   "INSERT INTO tbl(tbl) VALUES(<expr>)"
**
** Argument pVal contains the result of <expr>. Currently the only 
** meaningful value to insert is the text 'optimize'.
................................................................................

  if( !zVal ){
    return SQLITE_NOMEM;
  }else if( nVal==8 && 0==sqlite3_strnicmp(zVal, "optimize", 8) ){
    rc = fts3DoOptimize(p, 0);
  }else if( nVal==7 && 0==sqlite3_strnicmp(zVal, "rebuild", 7) ){
    rc = fts3DoRebuild(p);






#ifdef SQLITE_TEST
  }else if( nVal>9 && 0==sqlite3_strnicmp(zVal, "nodesize=", 9) ){
    p->nNodeSize = atoi(&zVal[9]);
    rc = SQLITE_OK;
  }else if( nVal>11 && 0==sqlite3_strnicmp(zVal, "maxpending=", 9) ){
    p->nMaxPendingData = atoi(&zVal[11]);
    rc = SQLITE_OK;
................................................................................
}

/*
** This function does the work for the xUpdate method of FTS3 virtual
** tables. The schema of the virtual table being:
**
**     CREATE TABLE <table name>( 
**       <user COLUMns>,
**       <table name> HIDDEN, 
**       docid HIDDEN, 
**       <langid> HIDDEN
**     );
**
** 
*/
................................................................................
    }
    if( p->bHasDocsize ){
      fts3InsertDocsize(&rc, p, aSzIns);
    }
    nChng++;
  }

  if( p->bHasStat ){
    fts3UpdateDocTotals(&rc, p, aSzIns, aSzDel, nChng);
  }

 update_out:
  sqlite3_free(aSzIns);
  sqlite3Fts3SegmentsClose(p);
  return rc;
................................................................................
** This function is an fts3ExprIterate() callback used by fts3BestSnippet().
** Each invocation populates an element of the SnippetIter.aPhrase[] array.
*/
static int fts3SnippetFindPositions(Fts3Expr *pExpr, int iPhrase, void *ctx){
  SnippetIter *p = (SnippetIter *)ctx;
  SnippetPhrase *pPhrase = &p->aPhrase[iPhrase];
  char *pCsr;


  pPhrase->nToken = pExpr->pPhrase->nToken;

  pCsr = sqlite3Fts3EvalPhrasePoslist(p->pCsr, pExpr, p->iCol);

  if( pCsr ){
    int iFirst = 0;
    pPhrase->pList = pCsr;
    fts3GetDeltaPosition(&pCsr, &iFirst);
    assert( iFirst>=0 );
    pPhrase->pHead = pCsr;
    pPhrase->pTail = pCsr;
    pPhrase->iHead = iFirst;
    pPhrase->iTail = iFirst;
  }else{

    assert( pPhrase->pList==0 && pPhrase->pHead==0 && pPhrase->pTail==0 );

  }

  return SQLITE_OK;
}

/*
** Select the fragment of text consisting of nFragment contiguous tokens 
** from column iCol that represent the "best" snippet. The best snippet
** is the snippet with the highest score, where scores are calculated
** by adding:
................................................................................
** array that are different for each row returned by the query.
*/
static int fts3ExprLocalHitsCb(
  Fts3Expr *pExpr,                /* Phrase expression node */
  int iPhrase,                    /* Phrase number */
  void *pCtx                      /* Pointer to MatchInfo structure */
){

  MatchInfo *p = (MatchInfo *)pCtx;
  int iStart = iPhrase * p->nCol * 3;
  int i;

  for(i=0; i<p->nCol; i++){
    char *pCsr;
    pCsr = sqlite3Fts3EvalPhrasePoslist(p->pCursor, pExpr, i);
    if( pCsr ){
      p->aMatchinfo[iStart+i*3] = fts3ColumnlistCount(&pCsr);
    }else{
      p->aMatchinfo[iStart+i*3] = 0;
    }
  }

  return SQLITE_OK;
}

static int fts3MatchinfoCheck(
  Fts3Table *pTab, 
  char cArg,
  char **pzErr
){
  if( (cArg==FTS3_MATCHINFO_NPHRASE)
   || (cArg==FTS3_MATCHINFO_NCOL)
   || (cArg==FTS3_MATCHINFO_NDOC && pTab->bHasStat)
   || (cArg==FTS3_MATCHINFO_AVGLENGTH && pTab->bHasStat)
   || (cArg==FTS3_MATCHINFO_LENGTH && pTab->bHasDocsize)
   || (cArg==FTS3_MATCHINFO_LCS)
   || (cArg==FTS3_MATCHINFO_HITS)
  ){
    return SQLITE_OK;
  }
  *pzErr = sqlite3_mprintf("unrecognized matchinfo request: %c", cArg);
................................................................................
  }

  for(iCol=0; iCol<pInfo->nCol; iCol++){
    int nLcs = 0;                 /* LCS value for this column */
    int nLive = 0;                /* Number of iterators in aIter not at EOF */

    for(i=0; i<pInfo->nPhrase; i++){

      LcsIterator *pIt = &aIter[i];
      pIt->pRead = sqlite3Fts3EvalPhrasePoslist(pCsr, pIt->pExpr, iCol);

      if( pIt->pRead ){
        pIt->iPos = pIt->iPosOffset;
        fts3LcsIteratorAdvance(&aIter[i]);
        nLive++;
      }
    }

................................................................................
*/
static int fts3ExprTermOffsetInit(Fts3Expr *pExpr, int iPhrase, void *ctx){
  TermOffsetCtx *p = (TermOffsetCtx *)ctx;
  int nTerm;                      /* Number of tokens in phrase */
  int iTerm;                      /* For looping through nTerm phrase terms */
  char *pList;                    /* Pointer to position list for phrase */
  int iPos = 0;                   /* First position in position-list */


  UNUSED_PARAMETER(iPhrase);
  pList = sqlite3Fts3EvalPhrasePoslist(p->pCsr, pExpr, p->iCol);
  nTerm = pExpr->pPhrase->nToken;
  if( pList ){
    fts3GetDeltaPosition(&pList, &iPos);
    assert( iPos>=0 );
  }

  for(iTerm=0; iTerm<nTerm; iTerm++){
    TermOffset *pT = &p->aTerm[p->iTerm++];
    pT->iOff = nTerm-iTerm-1;
    pT->pList = pList;
    pT->iPos = iPos;
  }

  return SQLITE_OK;
}

/*
** Implementation of offsets() function.
*/
SQLITE_PRIVATE void sqlite3Fts3Offsets(
  sqlite3_context *pCtx,          /* SQLite function call context */
................................................................................
  int eCoordType;
};

/* Possible values for eCoordType: */
#define RTREE_COORD_REAL32 0
#define RTREE_COORD_INT32  1














/*
** The minimum number of cells allowed for a node is a third of the 
** maximum. In Gutman's notation:
**
**     m = M/3
**
** If an R*-tree "Reinsert" operation is required, the same number of
................................................................................
  int iCell;                        /* Index of current cell in pNode */
  int iStrategy;                    /* Copy of idxNum search parameter */
  int nConstraint;                  /* Number of entries in aConstraint */
  RtreeConstraint *aConstraint;     /* Search constraints. */
};

union RtreeCoord {
  float f;
  int i;
};

/*
** The argument is an RtreeCoord. Return the value stored within the RtreeCoord
** formatted as a double. This macro assumes that local variable pRtree points
** to the Rtree structure associated with the RtreeCoord.

*/



#define DCOORD(coord) (                           \
  (pRtree->eCoordType==RTREE_COORD_REAL32) ?      \
    ((double)coord.f) :                           \
    ((double)coord.i)                             \
)


/*
** A search constraint.
*/
struct RtreeConstraint {
  int iCoord;                     /* Index of constrained coordinate */
  int op;                         /* Constraining operation */
  double rValue;                  /* Constraint value. */
  int (*xGeom)(sqlite3_rtree_geometry *, int, double *, int *);
  sqlite3_rtree_geometry *pGeom;  /* Constraint callback argument for a MATCH */
};

/* Possible values for RtreeConstraint.op */
#define RTREE_EQ    0x41
#define RTREE_LE    0x42
#define RTREE_LT    0x43
................................................................................
/*
** An instance of this structure must be supplied as a blob argument to
** the right-hand-side of an SQL MATCH operator used to constrain an
** r-tree query.
*/
struct RtreeMatchArg {
  u32 magic;                      /* Always RTREE_GEOMETRY_MAGIC */
  int (*xGeom)(sqlite3_rtree_geometry *, int, double *, int *);
  void *pContext;
  int nParam;
  double aParam[1];
};

/*
** When a geometry callback is created (see sqlite3_rtree_geometry_callback),
** a single instance of the following structure is allocated. It is used
** as the context for the user-function created by by s_r_g_c(). The object
** is eventually deleted by the destructor mechanism provided by
** sqlite3_create_function_v2() (which is called by s_r_g_c() to create
** the geometry callback function).
*/
struct RtreeGeomCallback {
  int (*xGeom)(sqlite3_rtree_geometry *, int, double *, int *);
  void *pContext;
};

#ifndef MAX
# define MAX(x,y) ((x) < (y) ? (y) : (x))
#endif
#ifndef MIN
................................................................................
static int testRtreeGeom(
  Rtree *pRtree,                  /* R-Tree object */
  RtreeConstraint *pConstraint,   /* MATCH constraint to test */
  RtreeCell *pCell,               /* Cell to test */
  int *pbRes                      /* OUT: Test result */
){
  int i;
  double aCoord[RTREE_MAX_DIMENSIONS*2];
  int nCoord = pRtree->nDim*2;

  assert( pConstraint->op==RTREE_MATCH );
  assert( pConstraint->pGeom );

  for(i=0; i<nCoord; i++){
    aCoord[i] = DCOORD(pCell->aCoord[i]);
................................................................................
  int ii;
  int bRes = 0;
  int rc = SQLITE_OK;

  nodeGetCell(pRtree, pCursor->pNode, pCursor->iCell, &cell);
  for(ii=0; bRes==0 && ii<pCursor->nConstraint; ii++){
    RtreeConstraint *p = &pCursor->aConstraint[ii];
    double cell_min = DCOORD(cell.aCoord[(p->iCoord>>1)*2]);
    double cell_max = DCOORD(cell.aCoord[(p->iCoord>>1)*2+1]);

    assert(p->op==RTREE_LE || p->op==RTREE_LT || p->op==RTREE_GE 
        || p->op==RTREE_GT || p->op==RTREE_EQ || p->op==RTREE_MATCH
    );

    switch( p->op ){
      case RTREE_LE: case RTREE_LT: 
................................................................................
  RtreeCell cell;
  int ii;
  *pbEof = 0;

  nodeGetCell(pRtree, pCursor->pNode, pCursor->iCell, &cell);
  for(ii=0; ii<pCursor->nConstraint; ii++){
    RtreeConstraint *p = &pCursor->aConstraint[ii];
    double coord = DCOORD(cell.aCoord[p->iCoord]);
    int res;
    assert(p->op==RTREE_LE || p->op==RTREE_LT || p->op==RTREE_GE 
        || p->op==RTREE_GT || p->op==RTREE_EQ || p->op==RTREE_MATCH
    );
    switch( p->op ){
      case RTREE_LE: res = (coord<=p->rValue); break;
      case RTREE_LT: res = (coord<p->rValue);  break;
................................................................................

  if( i==0 ){
    i64 iRowid = nodeGetRowid(pRtree, pCsr->pNode, pCsr->iCell);
    sqlite3_result_int64(ctx, iRowid);
  }else{
    RtreeCoord c;
    nodeGetCoord(pRtree, pCsr->pNode, pCsr->iCell, i-1, &c);

    if( pRtree->eCoordType==RTREE_COORD_REAL32 ){
      sqlite3_result_double(ctx, c.f);
    }else{


      assert( pRtree->eCoordType==RTREE_COORD_INT32 );
      sqlite3_result_int(ctx, c.i);
    }
  }

  return SQLITE_OK;
}
................................................................................

  /* Check that value is actually a blob. */
  if( sqlite3_value_type(pValue)!=SQLITE_BLOB ) return SQLITE_ERROR;

  /* Check that the blob is roughly the right size. */
  nBlob = sqlite3_value_bytes(pValue);
  if( nBlob<(int)sizeof(RtreeMatchArg) 
   || ((nBlob-sizeof(RtreeMatchArg))%sizeof(double))!=0
  ){
    return SQLITE_ERROR;
  }

  pGeom = (sqlite3_rtree_geometry *)sqlite3_malloc(
      sizeof(sqlite3_rtree_geometry) + nBlob
  );
  if( !pGeom ) return SQLITE_NOMEM;
  memset(pGeom, 0, sizeof(sqlite3_rtree_geometry));
  p = (RtreeMatchArg *)&pGeom[1];

  memcpy(p, sqlite3_value_blob(pValue), nBlob);
  if( p->magic!=RTREE_GEOMETRY_MAGIC 
   || nBlob!=(int)(sizeof(RtreeMatchArg) + (p->nParam-1)*sizeof(double))
  ){
    sqlite3_free(pGeom);
    return SQLITE_ERROR;
  }

  pGeom->pContext = p->pContext;
  pGeom->nParam = p->nParam;
................................................................................
            ** an sqlite3_rtree_geometry_callback() SQL user function.
            */
            rc = deserializeGeometry(argv[ii], p);
            if( rc!=SQLITE_OK ){
              break;
            }
          }else{



            p->rValue = sqlite3_value_double(argv[ii]);

          }
        }
      }
    }
  
    if( rc==SQLITE_OK ){
      pCsr->pNode = 0;
................................................................................
  pIdxInfo->estimatedCost = (2000000.0 / (double)(iIdx + 1));
  return rc;
}

/*
** Return the N-dimensional volumn of the cell stored in *p.
*/
static float cellArea(Rtree *pRtree, RtreeCell *p){
  float area = 1.0;
  int ii;
  for(ii=0; ii<(pRtree->nDim*2); ii+=2){
    area = (float)(area * (DCOORD(p->aCoord[ii+1]) - DCOORD(p->aCoord[ii])));
  }
  return area;
}

/*
** Return the margin length of cell p. The margin length is the sum
** of the objects size in each dimension.
*/
static float cellMargin(Rtree *pRtree, RtreeCell *p){
  float margin = 0.0;
  int ii;
  for(ii=0; ii<(pRtree->nDim*2); ii+=2){
    margin += (float)(DCOORD(p->aCoord[ii+1]) - DCOORD(p->aCoord[ii]));
  }
  return margin;
}

/*
** Store the union of cells p1 and p2 in p1.
*/
................................................................................
  }
  return 1;
}

/*
** Return the amount cell p would grow by if it were unioned with pCell.
*/
static float cellGrowth(Rtree *pRtree, RtreeCell *p, RtreeCell *pCell){
  float area;
  RtreeCell cell;
  memcpy(&cell, p, sizeof(RtreeCell));
  area = cellArea(pRtree, &cell);
  cellUnion(pRtree, &cell, pCell);
  return (cellArea(pRtree, &cell)-area);
}

#if VARIANT_RSTARTREE_CHOOSESUBTREE || VARIANT_RSTARTREE_SPLIT
static float cellOverlap(
  Rtree *pRtree, 
  RtreeCell *p, 
  RtreeCell *aCell, 
  int nCell, 
  int iExclude
){
  int ii;
  float overlap = 0.0;
  for(ii=0; ii<nCell; ii++){
#if VARIANT_RSTARTREE_CHOOSESUBTREE
    if( ii!=iExclude )
#else
    assert( iExclude==-1 );
    UNUSED_PARAMETER(iExclude);
#endif
    {
      int jj;
      float o = 1.0;
      for(jj=0; jj<(pRtree->nDim*2); jj+=2){
        double x1;
        double x2;

        x1 = MAX(DCOORD(p->aCoord[jj]), DCOORD(aCell[ii].aCoord[jj]));
        x2 = MIN(DCOORD(p->aCoord[jj+1]), DCOORD(aCell[ii].aCoord[jj+1]));

        if( x2<x1 ){
          o = 0.0;
          break;
        }else{
          o = o * (float)(x2-x1);
        }
      }
      overlap += o;
    }
  }
  return overlap;
}
#endif

#if VARIANT_RSTARTREE_CHOOSESUBTREE
static float cellOverlapEnlargement(
  Rtree *pRtree, 
  RtreeCell *p, 
  RtreeCell *pInsert, 
  RtreeCell *aCell, 
  int nCell, 
  int iExclude
){
  double before;
  double after;
  before = cellOverlap(pRtree, p, aCell, nCell, iExclude);
  cellUnion(pRtree, p, pInsert);
  after = cellOverlap(pRtree, p, aCell, nCell, iExclude);
  return (float)(after-before);
}
#endif


/*
** This function implements the ChooseLeaf algorithm from Gutman[84].
** ChooseSubTree in r*tree terminology.
................................................................................
  RtreeNode *pNode;
  rc = nodeAcquire(pRtree, 1, 0, &pNode);

  for(ii=0; rc==SQLITE_OK && ii<(pRtree->iDepth-iHeight); ii++){
    int iCell;
    sqlite3_int64 iBest = 0;

    float fMinGrowth = 0.0;
    float fMinArea = 0.0;
#if VARIANT_RSTARTREE_CHOOSESUBTREE
    float fMinOverlap = 0.0;
    float overlap;
#endif

    int nCell = NCELL(pNode);
    RtreeCell cell;
    RtreeNode *pChild;

    RtreeCell *aCell = 0;
................................................................................

    /* Select the child node which will be enlarged the least if pCell
    ** is inserted into it. Resolve ties by choosing the entry with
    ** the smallest area.
    */
    for(iCell=0; iCell<nCell; iCell++){
      int bBest = 0;
      float growth;
      float area;
      nodeGetCell(pRtree, pNode, iCell, &cell);
      growth = cellGrowth(pRtree, &cell, pCell);
      area = cellArea(pRtree, &cell);

#if VARIANT_RSTARTREE_CHOOSESUBTREE
      if( ii==(pRtree->iDepth-1) ){
        overlap = cellOverlapEnlargement(pRtree,&cell,pCell,aCell,nCell,iCell);
................................................................................
  int nCell, 
  int *piLeftSeed, 
  int *piRightSeed
){
  int i;
  int iLeftSeed = 0;
  int iRightSeed = 1;
  float maxNormalInnerWidth = 0.0;

  /* Pick two "seed" cells from the array of cells. The algorithm used
  ** here is the LinearPickSeeds algorithm from Gutman[1984]. The 
  ** indices of the two seed cells in the array are stored in local
  ** variables iLeftSeek and iRightSeed.
  */
  for(i=0; i<pRtree->nDim; i++){
    float x1 = DCOORD(aCell[0].aCoord[i*2]);
    float x2 = DCOORD(aCell[0].aCoord[i*2+1]);
    float x3 = x1;
    float x4 = x2;
    int jj;

    int iCellLeft = 0;
    int iCellRight = 0;

    for(jj=1; jj<nCell; jj++){
      float left = DCOORD(aCell[jj].aCoord[i*2]);
      float right = DCOORD(aCell[jj].aCoord[i*2+1]);

      if( left<x1 ) x1 = left;
      if( right>x4 ) x4 = right;
      if( left>x3 ){
        x3 = left;
        iCellRight = jj;
      }
................................................................................
      if( right<x2 ){
        x2 = right;
        iCellLeft = jj;
      }
    }

    if( x4!=x1 ){
      float normalwidth = (x3 - x2) / (x4 - x1);
      if( normalwidth>maxNormalInnerWidth ){
        iLeftSeed = iCellLeft;
        iRightSeed = iCellRight;
      }
    }
  }

................................................................................
  RtreeCell *pLeftBox, 
  RtreeCell *pRightBox,
  int *aiUsed
){
  #define FABS(a) ((a)<0.0?-1.0*(a):(a))

  int iSelect = -1;
  float fDiff;
  int ii;
  for(ii=0; ii<nCell; ii++){
    if( aiUsed[ii]==0 ){
      float left = cellGrowth(pRtree, pLeftBox, &aCell[ii]);
      float right = cellGrowth(pRtree, pLeftBox, &aCell[ii]);
      float diff = FABS(right-left);
      if( iSelect<0 || diff>fDiff ){
        fDiff = diff;
        iSelect = ii;
      }
    }
  }
  aiUsed[iSelect] = 1;
................................................................................
  int *piRightSeed
){
  int ii;
  int jj;

  int iLeftSeed = 0;
  int iRightSeed = 1;
  float fWaste = 0.0;

  for(ii=0; ii<nCell; ii++){
    for(jj=ii+1; jj<nCell; jj++){
      float right = cellArea(pRtree, &aCell[jj]);
      float growth = cellGrowth(pRtree, &aCell[ii], &aCell[jj]);
      float waste = growth - right;

      if( waste>fWaste ){
        iLeftSeed = ii;
        iRightSeed = jj;
        fWaste = waste;
      }
    }
................................................................................
**
** The aSpare array is used as temporary working space by the
** sorting algorithm.
*/
static void SortByDistance(
  int *aIdx, 
  int nIdx, 
  float *aDistance, 
  int *aSpare
){
  if( nIdx>1 ){
    int iLeft = 0;
    int iRight = 0;

    int nLeft = nIdx/2;
................................................................................
      if( iLeft==nLeft ){
        aIdx[iLeft+iRight] = aRight[iRight];
        iRight++;
      }else if( iRight==nRight ){
        aIdx[iLeft+iRight] = aLeft[iLeft];
        iLeft++;
      }else{
        float fLeft = aDistance[aLeft[iLeft]];
        float fRight = aDistance[aRight[iRight]];
        if( fLeft<fRight ){
          aIdx[iLeft+iRight] = aLeft[iLeft];
          iLeft++;
        }else{
          aIdx[iLeft+iRight] = aRight[iRight];
          iRight++;
        }
................................................................................
    }

#if 0
    /* Check that the sort worked */
    {
      int jj;
      for(jj=1; jj<nIdx; jj++){
        float left = aDistance[aIdx[jj-1]];
        float right = aDistance[aIdx[jj]];
        assert( left<=right );
      }
    }
#endif
  }
}

................................................................................

    SortByDimension(pRtree, aLeft, nLeft, iDim, aCell, aSpare);
    SortByDimension(pRtree, aRight, nRight, iDim, aCell, aSpare);

    memcpy(aSpare, aLeft, sizeof(int)*nLeft);
    aLeft = aSpare;
    while( iLeft<nLeft || iRight<nRight ){
      double xleft1 = DCOORD(aCell[aLeft[iLeft]].aCoord[iDim*2]);
      double xleft2 = DCOORD(aCell[aLeft[iLeft]].aCoord[iDim*2+1]);
      double xright1 = DCOORD(aCell[aRight[iRight]].aCoord[iDim*2]);
      double xright2 = DCOORD(aCell[aRight[iRight]].aCoord[iDim*2+1]);
      if( (iLeft!=nLeft) && ((iRight==nRight)
       || (xleft1<xright1)
       || (xleft1==xright1 && xleft2<xright2)
      )){
        aIdx[iLeft+iRight] = aLeft[iLeft];
        iLeft++;
      }else{
................................................................................
    }

#if 0
    /* Check that the sort worked */
    {
      int jj;
      for(jj=1; jj<nIdx; jj++){
        float xleft1 = aCell[aIdx[jj-1]].aCoord[iDim*2];
        float xleft2 = aCell[aIdx[jj-1]].aCoord[iDim*2+1];
        float xright1 = aCell[aIdx[jj]].aCoord[iDim*2];
        float xright2 = aCell[aIdx[jj]].aCoord[iDim*2+1];
        assert( xleft1<=xright1 && (xleft1<xright1 || xleft2<=xright2) );
      }
    }
#endif
  }
}

................................................................................
){
  int **aaSorted;
  int *aSpare;
  int ii;

  int iBestDim = 0;
  int iBestSplit = 0;
  float fBestMargin = 0.0;

  int nByte = (pRtree->nDim+1)*(sizeof(int*)+nCell*sizeof(int));

  aaSorted = (int **)sqlite3_malloc(nByte);
  if( !aaSorted ){
    return SQLITE_NOMEM;
  }
................................................................................
    for(jj=0; jj<nCell; jj++){
      aaSorted[ii][jj] = jj;
    }
    SortByDimension(pRtree, aaSorted[ii], nCell, ii, aCell, aSpare);
  }

  for(ii=0; ii<pRtree->nDim; ii++){
    float margin = 0.0;
    float fBestOverlap = 0.0;
    float fBestArea = 0.0;
    int iBestLeft = 0;
    int nLeft;

    for(
      nLeft=RTREE_MINCELLS(pRtree); 
      nLeft<=(nCell-RTREE_MINCELLS(pRtree)); 
      nLeft++
    ){
      RtreeCell left;
      RtreeCell right;
      int kk;
      float overlap;
      float area;

      memcpy(&left, &aCell[aaSorted[ii][0]], sizeof(RtreeCell));
      memcpy(&right, &aCell[aaSorted[ii][nCell-1]], sizeof(RtreeCell));
      for(kk=1; kk<(nCell-1); kk++){
        if( kk<nLeft ){
          cellUnion(pRtree, &left, &aCell[aaSorted[ii][kk]]);
        }else{
................................................................................
  nodeInsertCell(pRtree, pRight, &aCell[iRightSeed]);
  aiUsed[iLeftSeed] = 1;
  aiUsed[iRightSeed] = 1;

  for(i=nCell-2; i>0; i--){
    RtreeCell *pNext;
    pNext = PickNext(pRtree, aCell, nCell, pBboxLeft, pBboxRight, aiUsed);
    float diff =  
      cellGrowth(pRtree, pBboxLeft, pNext) - 
      cellGrowth(pRtree, pBboxRight, pNext)
    ;
    if( (RTREE_MINCELLS(pRtree)-NCELL(pRight)==i)
     || (diff>0.0 && (RTREE_MINCELLS(pRtree)-NCELL(pLeft)!=i))
    ){
      nodeInsertCell(pRtree, pRight, pNext);
................................................................................
  RtreeNode *pNode, 
  RtreeCell *pCell, 
  int iHeight
){
  int *aOrder;
  int *aSpare;
  RtreeCell *aCell;
  float *aDistance;
  int nCell;
  float aCenterCoord[RTREE_MAX_DIMENSIONS];
  int iDim;
  int ii;
  int rc = SQLITE_OK;


  memset(aCenterCoord, 0, sizeof(float)*RTREE_MAX_DIMENSIONS);

  nCell = NCELL(pNode)+1;


  /* Allocate the buffers used by this operation. The allocation is
  ** relinquished before this function returns.
  */
  aCell = (RtreeCell *)sqlite3_malloc(nCell * (
    sizeof(RtreeCell) +         /* aCell array */
    sizeof(int)       +         /* aOrder array */
    sizeof(int)       +         /* aSpare array */
    sizeof(float)               /* aDistance array */
  ));
  if( !aCell ){
    return SQLITE_NOMEM;
  }
  aOrder    = (int *)&aCell[nCell];
  aSpare    = (int *)&aOrder[nCell];
  aDistance = (float *)&aSpare[nCell];

  for(ii=0; ii<nCell; ii++){
    if( ii==(nCell-1) ){
      memcpy(&aCell[ii], pCell, sizeof(RtreeCell));
    }else{
      nodeGetCell(pRtree, pNode, ii, &aCell[ii]);
    }
    aOrder[ii] = ii;
    for(iDim=0; iDim<pRtree->nDim; iDim++){
      aCenterCoord[iDim] += (float)DCOORD(aCell[ii].aCoord[iDim*2]);
      aCenterCoord[iDim] += (float)DCOORD(aCell[ii].aCoord[iDim*2+1]);
    }
  }
  for(iDim=0; iDim<pRtree->nDim; iDim++){
    aCenterCoord[iDim] = (float)(aCenterCoord[iDim]/((float)nCell*2.0));
  }

  for(ii=0; ii<nCell; ii++){
    aDistance[ii] = 0.0;
    for(iDim=0; iDim<pRtree->nDim; iDim++){
      float coord = (float)(DCOORD(aCell[ii].aCoord[iDim*2+1]) - 
          DCOORD(aCell[ii].aCoord[iDim*2]));
      aDistance[ii] += (coord-aCenterCoord[iDim])*(coord-aCenterCoord[iDim]);
    }
  }

  SortByDistance(aOrder, nCell, aDistance, aSpare);
  nodeZero(pRtree, pNode);

................................................................................
  ** conflict-handling mode specified by the user.
  */
  if( nData>1 ){
    int ii;

    /* Populate the cell.aCoord[] array. The first coordinate is azData[3]. */
    assert( nData==(pRtree->nDim*2 + 3) );

    if( pRtree->eCoordType==RTREE_COORD_REAL32 ){
      for(ii=0; ii<(pRtree->nDim*2); ii+=2){
        cell.aCoord[ii].f = (float)sqlite3_value_double(azData[ii+3]);
        cell.aCoord[ii+1].f = (float)sqlite3_value_double(azData[ii+4]);
        if( cell.aCoord[ii].f>cell.aCoord[ii+1].f ){
          rc = SQLITE_CONSTRAINT;
          goto constraint;
        }
      }
    }else{


      for(ii=0; ii<(pRtree->nDim*2); ii+=2){
        cell.aCoord[ii].i = sqlite3_value_int(azData[ii+3]);
        cell.aCoord[ii+1].i = sqlite3_value_int(azData[ii+4]);
        if( cell.aCoord[ii].i>cell.aCoord[ii+1].i ){
          rc = SQLITE_CONSTRAINT;
          goto constraint;
        }
................................................................................
    RtreeCell cell;
    int jj;

    nodeGetCell(&tree, &node, ii, &cell);
    sqlite3_snprintf(512-nCell,&zCell[nCell],"%lld", cell.iRowid);
    nCell = (int)strlen(zCell);
    for(jj=0; jj<tree.nDim*2; jj++){

      sqlite3_snprintf(512-nCell,&zCell[nCell]," %f",(double)cell.aCoord[jj].f);





      nCell = (int)strlen(zCell);
    }

    if( zText ){
      char *zTextNew = sqlite3_mprintf("%s {%s}", zText, zCell);
      sqlite3_free(zText);
      zText = zTextNew;
................................................................................
  int rc;

  rc = sqlite3_create_function(db, "rtreenode", 2, utf8, 0, rtreenode, 0, 0);
  if( rc==SQLITE_OK ){
    rc = sqlite3_create_function(db, "rtreedepth", 1, utf8, 0,rtreedepth, 0, 0);
  }
  if( rc==SQLITE_OK ){



    void *c = (void *)RTREE_COORD_REAL32;

    rc = sqlite3_create_module_v2(db, "rtree", &rtreeModule, c, 0);
  }
  if( rc==SQLITE_OK ){
    void *c = (void *)RTREE_COORD_INT32;
    rc = sqlite3_create_module_v2(db, "rtree_i32", &rtreeModule, c, 0);
  }

................................................................................
** table MATCH operators.
*/
static void geomCallback(sqlite3_context *ctx, int nArg, sqlite3_value **aArg){
  RtreeGeomCallback *pGeomCtx = (RtreeGeomCallback *)sqlite3_user_data(ctx);
  RtreeMatchArg *pBlob;
  int nBlob;

  nBlob = sizeof(RtreeMatchArg) + (nArg-1)*sizeof(double);
  pBlob = (RtreeMatchArg *)sqlite3_malloc(nBlob);
  if( !pBlob ){
    sqlite3_result_error_nomem(ctx);
  }else{
    int i;
    pBlob->magic = RTREE_GEOMETRY_MAGIC;
    pBlob->xGeom = pGeomCtx->xGeom;
    pBlob->pContext = pGeomCtx->pContext;
    pBlob->nParam = nArg;
    for(i=0; i<nArg; i++){



      pBlob->aParam[i] = sqlite3_value_double(aArg[i]);

    }
    sqlite3_result_blob(ctx, pBlob, nBlob, doSqlite3Free);
  }
}

/*
** Register a new geometry function for use with the r-tree MATCH operator.
*/
SQLITE_API int sqlite3_rtree_geometry_callback(
  sqlite3 *db,
  const char *zGeom,
  int (*xGeom)(sqlite3_rtree_geometry *, int, double *, int *),
  void *pContext
){
  RtreeGeomCallback *pGeomCtx;      /* Context object for new user-function */

  /* Allocate and populate the context object. */
  pGeomCtx = (RtreeGeomCallback *)sqlite3_malloc(sizeof(RtreeGeomCallback));
  if( !pGeomCtx ) return SQLITE_NOMEM;
................................................................................

  UChar32 c;
  int iInput = 0;
  int iOut = 0;

  *ppCursor = 0;




  if( nInput<0 ){
    nInput = strlen(zInput);
  }
  nChar = nInput+1;
  pCsr = (IcuCursor *)sqlite3_malloc(
      sizeof(IcuCursor) +                /* IcuCursor */
      nChar * sizeof(UChar) +            /* IcuCursor.aChar[] */
      (nChar+1) * sizeof(int)            /* IcuCursor.aOffset[] */

/******************************************************************************
** This file is an amalgamation of many separate C source files from SQLite
** version 3.7.12.  By combining all the individual C code files into this 
** single large file, the entire code can be compiled as a single translation
** unit.  This allows many compilers to do optimizations that would not be
** possible if the files were compiled separately.  Performance improvements
** of 5% or more are commonly seen when SQLite is compiled as a single
** translation unit.
**
** This file is all you need to compile SQLite.  To use SQLite in other
................................................................................
** string contains the date and time of the check-in (UTC) and an SHA1
** hash of the entire source tree.
**
** See also: [sqlite3_libversion()],
** [sqlite3_libversion_number()], [sqlite3_sourceid()],
** [sqlite_version()] and [sqlite_source_id()].
*/
#define SQLITE_VERSION        "3.7.12"
#define SQLITE_VERSION_NUMBER 3007012
#define SQLITE_SOURCE_ID      "2012-05-12 01:14:27 93061c6e063fddfa6b5d21064a36b58cc97599f1"

/*
** CAPI3REF: Run-Time Library Version Numbers
** KEYWORDS: sqlite3_version, sqlite3_sourceid
**
** These interfaces provide the same information as the [SQLITE_VERSION],
** [SQLITE_VERSION_NUMBER], and [SQLITE_SOURCE_ID] C preprocessor macros
................................................................................
#define SQLITE_IOERR_SHMSIZE           (SQLITE_IOERR | (19<<8))
#define SQLITE_IOERR_SHMLOCK           (SQLITE_IOERR | (20<<8))
#define SQLITE_IOERR_SHMMAP            (SQLITE_IOERR | (21<<8))
#define SQLITE_IOERR_SEEK              (SQLITE_IOERR | (22<<8))
#define SQLITE_LOCKED_SHAREDCACHE      (SQLITE_LOCKED |  (1<<8))
#define SQLITE_BUSY_RECOVERY           (SQLITE_BUSY   |  (1<<8))
#define SQLITE_CANTOPEN_NOTEMPDIR      (SQLITE_CANTOPEN | (1<<8))
#define SQLITE_CANTOPEN_ISDIR          (SQLITE_CANTOPEN | (2<<8))
#define SQLITE_CORRUPT_VTAB            (SQLITE_CORRUPT | (1<<8))
#define SQLITE_READONLY_RECOVERY       (SQLITE_READONLY | (1<<8))
#define SQLITE_READONLY_CANTLOCK       (SQLITE_READONLY | (2<<8))
#define SQLITE_ABORT_ROLLBACK          (SQLITE_ABORT | (2<<8))

/*
** CAPI3REF: Flags For File Open Operations
................................................................................
** connection is opened. If it is globally disabled, filenames are
** only interpreted as URIs if the SQLITE_OPEN_URI flag is set when the
** database connection is opened. By default, URI handling is globally
** disabled. The default value may be changed by compiling with the
** [SQLITE_USE_URI] symbol defined.
**
** [[SQLITE_CONFIG_PCACHE]] [[SQLITE_CONFIG_GETPCACHE]]
** <dt>SQLITE_CONFIG_PCACHE and SQLITE_CONFIG_GETPCACHE
** <dd> These options are obsolete and should not be used by new code.
** They are retained for backwards compatibility but are now no-ops.
** </dl>
*/
#define SQLITE_CONFIG_SINGLETHREAD  1  /* nil */
#define SQLITE_CONFIG_MULTITHREAD   2  /* nil */
#define SQLITE_CONFIG_SERIALIZED    3  /* nil */
................................................................................
** </dd>
**
** [[SQLITE_DBSTATUS_CACHE_MISS]] ^(<dt>SQLITE_DBSTATUS_CACHE_MISS</dt>
** <dd>This parameter returns the number of pager cache misses that have
** occurred.)^ ^The highwater mark associated with SQLITE_DBSTATUS_CACHE_MISS 
** is always 0.
** </dd>
**
** [[SQLITE_DBSTATUS_CACHE_WRITE]] ^(<dt>SQLITE_DBSTATUS_CACHE_WRITE</dt>
** <dd>This parameter returns the number of dirty cache entries that have
** been written to disk. Specifically, the number of pages written to the
** wal file in wal mode databases, or the number of pages written to the
** database file in rollback mode databases. Any pages written as part of
** transaction rollback or database recovery operations are not included.
** If an IO or other error occurs while writing a page to disk, the effect
** on subsequent SQLITE_DBSTATUS_CACHE_WRITE requests is undefined.)^ ^The
** highwater mark associated with SQLITE_DBSTATUS_CACHE_WRITE is always 0.
** </dd>
** </dl>
*/
#define SQLITE_DBSTATUS_LOOKASIDE_USED       0
#define SQLITE_DBSTATUS_CACHE_USED           1
#define SQLITE_DBSTATUS_SCHEMA_USED          2
#define SQLITE_DBSTATUS_STMT_USED            3
#define SQLITE_DBSTATUS_LOOKASIDE_HIT        4
#define SQLITE_DBSTATUS_LOOKASIDE_MISS_SIZE  5
#define SQLITE_DBSTATUS_LOOKASIDE_MISS_FULL  6
#define SQLITE_DBSTATUS_CACHE_HIT            7
#define SQLITE_DBSTATUS_CACHE_MISS           8
#define SQLITE_DBSTATUS_CACHE_WRITE          9
#define SQLITE_DBSTATUS_MAX                  9   /* Largest defined DBSTATUS */


/*
** CAPI3REF: Prepared Statement Status
**
** ^(Each prepared statement maintains various
** [SQLITE_STMTSTATUS counters] that measure the number
................................................................................
** R-Tree geometry query as follows:
**
**   SELECT ... FROM <rtree> WHERE <rtree col> MATCH $zGeom(... params ...)
*/
SQLITE_API int sqlite3_rtree_geometry_callback(
  sqlite3 *db,
  const char *zGeom,
#ifdef SQLITE_RTREE_INT_ONLY
  int (*xGeom)(sqlite3_rtree_geometry*, int n, sqlite3_int64 *a, int *pRes),
#else
  int (*xGeom)(sqlite3_rtree_geometry*, int n, double *a, int *pRes),
#endif
  void *pContext
);


/*
** A pointer to a structure of the following type is passed as the first
** argument to callbacks registered using rtree_geometry_callback().
................................................................................
struct FuncDestructor {
  int nRef;
  void (*xDestroy)(void *);
  void *pUserData;
};

/*
** Possible values for FuncDef.flags.  Note that the _LENGTH and _TYPEOF
** values must correspond to OPFLAG_LENGTHARG and OPFLAG_TYPEOFARG.  There
** are assert() statements in the code to verify this.
*/
#define SQLITE_FUNC_LIKE     0x01 /* Candidate for the LIKE optimization */
#define SQLITE_FUNC_CASE     0x02 /* Case-sensitive LIKE-type function */
#define SQLITE_FUNC_EPHEM    0x04 /* Ephemeral.  Delete with VDBE */
#define SQLITE_FUNC_NEEDCOLL 0x08 /* sqlite3GetFuncCollSeq() might be called */
#define SQLITE_FUNC_COUNT    0x10 /* Built-in count(*) aggregate */
#define SQLITE_FUNC_COALESCE 0x20 /* Built-in coalesce() or ifnull() function */
#define SQLITE_FUNC_LENGTH   0x40 /* Built-in length() function */
#define SQLITE_FUNC_TYPEOF   0x80 /* Built-in typeof() function */

/*
** The following three macros, FUNCTION(), LIKEFUNC() and AGGREGATE() are
** used to create the initializers for the FuncDef structures.
**
**   FUNCTION(zName, nArg, iArg, bNC, xFunc)
**     Used to create a scalar function definition of a function zName 
................................................................................
**     that accepts nArg arguments and is implemented by a call to C 
**     function likeFunc. Argument pArg is cast to a (void *) and made
**     available as the function user-data (sqlite3_user_data()). The
**     FuncDef.flags variable is set to the value passed as the flags
**     parameter.
*/
#define FUNCTION(zName, nArg, iArg, bNC, xFunc) \
  {nArg, SQLITE_UTF8, (bNC*SQLITE_FUNC_NEEDCOLL), \
   SQLITE_INT_TO_PTR(iArg), 0, xFunc, 0, 0, #zName, 0, 0}
#define FUNCTION2(zName, nArg, iArg, bNC, xFunc, extraFlags) \
  {nArg, SQLITE_UTF8, (bNC*SQLITE_FUNC_NEEDCOLL)|extraFlags, \
   SQLITE_INT_TO_PTR(iArg), 0, xFunc, 0, 0, #zName, 0, 0}
#define STR_FUNCTION(zName, nArg, pArg, bNC, xFunc) \
  {nArg, SQLITE_UTF8, bNC*SQLITE_FUNC_NEEDCOLL, \
   pArg, 0, xFunc, 0, 0, #zName, 0, 0}
#define LIKEFUNC(zName, nArg, arg, flags) \
  {nArg, SQLITE_UTF8, flags, (void *)arg, 0, likeFunc, 0, 0, #zName, 0, 0}
#define AGGREGATE(zName, nArg, arg, nc, xStep, xFinal) \
................................................................................
  Select *pSelect;     /* NULL for tables.  Points to definition if a view. */
  u16 nRef;            /* Number of pointers to this Table */
  u8 tabFlags;         /* Mask of TF_* values */
  u8 keyConf;          /* What to do in case of uniqueness conflict on iPKey */
  FKey *pFKey;         /* Linked list of all foreign keys in this table */
  char *zColAff;       /* String defining the affinity of each column */
#ifndef SQLITE_OMIT_CHECK
  ExprList *pCheck;    /* All CHECK constraints */
#endif
#ifndef SQLITE_OMIT_ALTERTABLE
  int addColOffset;    /* Offset in CREATE TABLE stmt to add a new column */
#endif
#ifndef SQLITE_OMIT_VIRTUALTABLE
  VTable *pVTable;     /* List of VTable objects. */
  int nModuleArg;      /* Number of arguments to the module */
................................................................................
                         ** TK_TRIGGER: 1 -> new, 0 -> old */
  ynVar iColumn;         /* TK_COLUMN: column index.  -1 for rowid.
                         ** TK_VARIABLE: variable number (always >= 1). */
  i16 iAgg;              /* Which entry in pAggInfo->aCol[] or ->aFunc[] */
  i16 iRightJoinTable;   /* If EP_FromJoin, the right table of the join */
  u8 flags2;             /* Second set of flags.  EP2_... */
  u8 op2;                /* If a TK_REGISTER, the original value of Expr.op */
                         /* If TK_COLUMN, the value of p5 for OP_Column */
  AggInfo *pAggInfo;     /* Used by TK_AGG_COLUMN and TK_AGG_FUNCTION */
  Table *pTab;           /* Table for TK_COLUMN expressions. */
#if SQLITE_MAX_EXPR_DEPTH>0
  int nHeight;           /* Height of the tree headed by this node */
#endif
};

................................................................................
#define EP_VarSelect  0x0020  /* pSelect is correlated, not constant */
#define EP_DblQuoted  0x0040  /* token.z was originally in "..." */
#define EP_InfixFunc  0x0080  /* True for an infix function: LIKE, GLOB, etc */
#define EP_ExpCollate 0x0100  /* Collating sequence specified explicitly */
#define EP_FixedDest  0x0200  /* Result needed in a specific register */
#define EP_IntValue   0x0400  /* Integer value contained in u.iValue */
#define EP_xIsSelect  0x0800  /* x.pSelect is valid (otherwise x.pList is) */
#define EP_Hint       0x1000  /* Not used */
#define EP_Reduced    0x2000  /* Expr struct is EXPR_REDUCEDSIZE bytes only */
#define EP_TokenOnly  0x4000  /* Expr struct is EXPR_TOKENONLYSIZE bytes only */
#define EP_Static     0x8000  /* Held in memory not obtained from malloc() */

/*
** The following are the meanings of bits in the Expr.flags2 field.
*/
................................................................................
  SrcList *pSrcList;   /* One or more tables used to resolve names */
  ExprList *pEList;    /* Optional list of named expressions */
  int nRef;            /* Number of names resolved by this context */
  int nErr;            /* Number of errors encountered while resolving names */
  u8 allowAgg;         /* Aggregate functions allowed here */
  u8 hasAgg;           /* True if aggregates are seen */
  u8 isCheck;          /* True if resolving names in a CHECK constraint */

  AggInfo *pAggInfo;   /* Information about aggregates at this level */
  NameContext *pNext;  /* Next outer name context.  NULL for outermost */
};

/*
** An instance of the following structure contains all information
** needed to generate code for a single SELECT statement.
................................................................................
  yDbMask writeMask;   /* Start a write transaction on these databases */
  yDbMask cookieMask;  /* Bitmask of schema verified databases */
  int cookieGoto;      /* Address of OP_Goto to cookie verifier subroutine */
  int cookieValue[SQLITE_MAX_ATTACHED+2];  /* Values of cookies to verify */
  int regRowid;        /* Register holding rowid of CREATE TABLE entry */
  int regRoot;         /* Register holding root page number for new objects */
  int nMaxArg;         /* Max args passed to user function by sub-program */
  Token constraintName;/* Name of the constraint currently being parsed */
#ifndef SQLITE_OMIT_SHARED_CACHE
  int nTableLock;        /* Number of locks in aTableLock */
  TableLock *aTableLock; /* Required table locks for shared-cache mode */
#endif
  AutoincInfo *pAinc;  /* Information about AUTOINCREMENT counters */

  /* Information used while coding trigger programs. */
................................................................................
*/
struct AuthContext {
  const char *zAuthContext;   /* Put saved Parse.zAuthContext here */
  Parse *pParse;              /* The Parse structure */
};

/*
** Bitfield flags for P5 value in various opcodes.
*/
#define OPFLAG_NCHANGE       0x01    /* Set to update db->nChange */
#define OPFLAG_LASTROWID     0x02    /* Set to update db->lastRowid */
#define OPFLAG_ISUPDATE      0x04    /* This OP_Insert is an sql UPDATE */
#define OPFLAG_APPEND        0x08    /* This is likely to be an append */
#define OPFLAG_USESEEKRESULT 0x10    /* Try to avoid a seek in BtreeInsert() */
#define OPFLAG_CLEARCACHE    0x20    /* Clear pseudo-table cache in OP_Column */
#define OPFLAG_LENGTHARG     0x40    /* OP_Column only used for length() */
#define OPFLAG_TYPEOFARG     0x80    /* OP_Column only used for typeof() */

/*
 * Each trigger present in the database schema is stored as an instance of
 * struct Trigger. 
 *
 * Pointers to instances of struct Trigger are stored in two ways.
 * 1. In the "trigHash" hash table (part of the sqlite3* that represents the 
................................................................................
struct Walker {
  int (*xExprCallback)(Walker*, Expr*);     /* Callback for expressions */
  int (*xSelectCallback)(Walker*,Select*);  /* Callback for SELECTs */
  Parse *pParse;                            /* Parser context.  */
  union {                                   /* Extra data for callback */
    NameContext *pNC;                          /* Naming context */
    int i;                                     /* Integer value */
    SrcList *pSrcList;                         /* FROM clause */
  } u;
};

/* Forward declarations */
SQLITE_PRIVATE int sqlite3WalkExpr(Walker*, Expr*);
SQLITE_PRIVATE int sqlite3WalkExprList(Walker*, ExprList*);
SQLITE_PRIVATE int sqlite3WalkSelect(Walker*, Select*);
................................................................................
#if defined(SQLITE_ENABLE_UPDATE_DELETE_LIMIT) && !defined(SQLITE_OMIT_SUBQUERY)
SQLITE_PRIVATE Expr *sqlite3LimitWhere(Parse *, SrcList *, Expr *, ExprList *, Expr *, Expr *, char *);
#endif
SQLITE_PRIVATE void sqlite3DeleteFrom(Parse*, SrcList*, Expr*);
SQLITE_PRIVATE void sqlite3Update(Parse*, SrcList*, ExprList*, Expr*, int);
SQLITE_PRIVATE WhereInfo *sqlite3WhereBegin(Parse*, SrcList*, Expr*, ExprList**,ExprList*,u16);
SQLITE_PRIVATE void sqlite3WhereEnd(WhereInfo*);
SQLITE_PRIVATE int sqlite3ExprCodeGetColumn(Parse*, Table*, int, int, int, u8);
SQLITE_PRIVATE void sqlite3ExprCodeGetColumnOfTable(Vdbe*, Table*, int, int, int);
SQLITE_PRIVATE void sqlite3ExprCodeMove(Parse*, int, int, int);
SQLITE_PRIVATE void sqlite3ExprCodeCopy(Parse*, int, int, int);
SQLITE_PRIVATE void sqlite3ExprCacheStore(Parse*, int, int, int);
SQLITE_PRIVATE void sqlite3ExprCachePush(Parse*);
SQLITE_PRIVATE void sqlite3ExprCachePop(Parse*, int);
SQLITE_PRIVATE void sqlite3ExprCacheRemove(Parse*, int, int);
................................................................................
SQLITE_PRIVATE void sqlite3HaltConstraint(Parse*, int, char*, int);
SQLITE_PRIVATE Expr *sqlite3ExprDup(sqlite3*,Expr*,int);
SQLITE_PRIVATE ExprList *sqlite3ExprListDup(sqlite3*,ExprList*,int);
SQLITE_PRIVATE SrcList *sqlite3SrcListDup(sqlite3*,SrcList*,int);
SQLITE_PRIVATE IdList *sqlite3IdListDup(sqlite3*,IdList*);
SQLITE_PRIVATE Select *sqlite3SelectDup(sqlite3*,Select*,int);
SQLITE_PRIVATE void sqlite3FuncDefInsert(FuncDefHash*, FuncDef*);
SQLITE_PRIVATE FuncDef *sqlite3FindFunction(sqlite3*,const char*,int,int,u8,u8);
SQLITE_PRIVATE void sqlite3RegisterBuiltinFunctions(sqlite3*);
SQLITE_PRIVATE void sqlite3RegisterDateTimeFunctions(void);
SQLITE_PRIVATE void sqlite3RegisterGlobalFunctions(void);
SQLITE_PRIVATE int sqlite3SafetyCheckOk(sqlite3*);
SQLITE_PRIVATE int sqlite3SafetyCheckSickOrOk(sqlite3*);
SQLITE_PRIVATE void sqlite3ChangeCookie(Parse*, int);

................................................................................

    /*
    ** Set *pCurrent to the total cache hits or misses encountered by all
    ** pagers the database handle is connected to. *pHighwater is always set 
    ** to zero.
    */
    case SQLITE_DBSTATUS_CACHE_HIT:
    case SQLITE_DBSTATUS_CACHE_MISS:
    case SQLITE_DBSTATUS_CACHE_WRITE:{
      int i;
      int nRet = 0;
      assert( SQLITE_DBSTATUS_CACHE_MISS==SQLITE_DBSTATUS_CACHE_HIT+1 );
      assert( SQLITE_DBSTATUS_CACHE_WRITE==SQLITE_DBSTATUS_CACHE_HIT+2 );

      for(i=0; i<db->nDb; i++){
        if( db->aDb[i].pBt ){
          Pager *pPager = sqlite3BtreePager(db->aDb[i].pBt);
          sqlite3PagerCacheStat(pPager, op, resetFlag, &nRet);
        }
      }
................................................................................
/* Convenient short-hand */
#define UpperToLower sqlite3UpperToLower

/*
** Some systems have stricmp().  Others have strcasecmp().  Because
** there is no consistency, we will define our own.
**
** IMPLEMENTATION-OF: R-30243-02494 The sqlite3_stricmp() and
** sqlite3_strnicmp() APIs allow applications and extensions to compare
** the contents of two buffers containing UTF-8 strings in a
** case-independent fashion, using the same definition of "case
** independence" that SQLite uses internally when comparing identifiers.

*/
SQLITE_API int sqlite3_stricmp(const char *zLeft, const char *zRight){
  register unsigned char *a, *b;
  a = (unsigned char *)zLeft;
  b = (unsigned char *)zRight;
  while( *a!=0 && UpperToLower[*a]==UpperToLower[*b]){ a++; b++; }
  return UpperToLower[*a] - UpperToLower[*b];
................................................................................
** Default permissions when creating a new file
*/
#ifndef SQLITE_DEFAULT_FILE_PERMISSIONS
# define SQLITE_DEFAULT_FILE_PERMISSIONS 0644
#endif

/*
** Default permissions when creating auto proxy dir
*/
#ifndef SQLITE_DEFAULT_PROXYDIR_PERMISSIONS
# define SQLITE_DEFAULT_PROXYDIR_PERMISSIONS 0755
#endif

/*
** Maximum supported path-length.
*/
................................................................................
    if( aSyscall[i].pCurrent!=0 ) return aSyscall[i].zName;
  }
  return 0;
}

/*
** Invoke open().  Do so multiple times, until it either succeeds or
** fails for some reason other than EINTR.
**
** If the file creation mode "m" is 0 then set it to the default for
** SQLite.  The default is SQLITE_DEFAULT_FILE_PERMISSIONS (normally
** 0644) as modified by the system umask.  If m is not 0, then
** make the file creation mode be exactly m ignoring the umask.
**
** The m parameter will be non-zero only when creating -wal, -journal,
................................................................................
** permissions as their original database, unadulterated by the umask.
** In that way, if a database file is -rw-rw-rw or -rw-rw-r-, and a
** transaction crashes and leaves behind hot journals, then any
** process that is able to write to the database will also be able to
** recover the hot journals.
*/
static int robust_open(const char *z, int f, mode_t m){
  int fd;
  mode_t m2;
  mode_t origM = 0;
  if( m==0 ){
    m2 = SQLITE_DEFAULT_FILE_PERMISSIONS;
  }else{
    m2 = m;
    origM = osUmask(0);
  }
  do{
#if defined(O_CLOEXEC)
    fd = osOpen(z,f|O_CLOEXEC,m2);
#else
    fd = osOpen(z,f,m2);
#endif
  }while( fd<0 && errno==EINTR );
  if( m ){
    osUmask(origM);
  }
#if defined(FD_CLOEXEC) && (!defined(O_CLOEXEC) || O_CLOEXEC==0)
  if( fd>=0 ) osFcntl(fd, F_SETFD, osFcntl(fd, F_GETFD, 0) | FD_CLOEXEC);
#endif
  return fd;
}

/*
** Helper functions to obtain and relinquish the global mutex. The
** global mutex is used to protect the unixInodeInfo and
** vxworksFileId objects used by this file, all of which may be 
** shared by multiple threads.
................................................................................

  sqlite3_snprintf(MAX_PATHNAME, zDirname, "%s", zFilename);
  for(ii=(int)strlen(zDirname); ii>1 && zDirname[ii]!='/'; ii--);
  if( ii>0 ){
    zDirname[ii] = '\0';
    fd = robust_open(zDirname, O_RDONLY|O_BINARY, 0);
    if( fd>=0 ){



      OSTRACE(("OPENDIR %-3d %s\n", fd, zDirname));
    }
  }
  *pFd = fd;
  return (fd>=0?SQLITE_OK:unixLogError(SQLITE_CANTOPEN_BKPT, "open", zDirname));
}

................................................................................
  SimulateIOError( return SQLITE_IOERR_TRUNCATE );

  /* If the user has configured a chunk-size for this file, truncate the
  ** file so that it consists of an integer number of chunks (i.e. the
  ** actual file size after the operation may be larger than the requested
  ** size).
  */
  if( pFile->szChunk>0 ){
    nByte = ((nByte + pFile->szChunk - 1)/pFile->szChunk) * pFile->szChunk;
  }

  rc = robust_ftruncate(pFile->h, (off_t)nByte);
  if( rc ){
    pFile->lastErrno = errno;
    return unixLogError(SQLITE_IOERR_TRUNCATE, "ftruncate", pFile->zPath);
................................................................................
  }
#if SQLITE_ENABLE_LOCKING_STYLE
  else{
    p->openFlags = openFlags;
  }
#endif





  noLock = eType!=SQLITE_OPEN_MAIN_DB;

  
#if defined(__APPLE__) || SQLITE_ENABLE_LOCKING_STYLE
  if( fstatfs(fd, &fsInfo) == -1 ){
    ((unixFile*)pFile)->lastErrno = errno;
    robust_close(p, fd, __LINE__);
................................................................................
    ){
       osSleep(100);  /* Wait a little before trying again */
    }
    sqlite3_free(pFile->zDeleteOnClose);
  }
#endif
  OSTRACE(("CLOSE %d %s\n", pFile->h, rc ? "ok" : "failed"));
  if( rc ){
    pFile->h = NULL;
  }
  OpenCounter(-1);
  return rc ? SQLITE_OK
            : winLogError(SQLITE_IOERR_CLOSE, osGetLastError(),
                          "winClose", pFile->zPath);
}

/*
................................................................................
*/
static int winRead(
  sqlite3_file *id,          /* File to read from */
  void *pBuf,                /* Write content into this buffer */
  int amt,                   /* Number of bytes to read */
  sqlite3_int64 offset       /* Begin reading at this offset */
){
#if !SQLITE_OS_WINCE
  OVERLAPPED overlapped;          /* The offset for ReadFile. */
#endif
  winFile *pFile = (winFile*)id;  /* file handle */
  DWORD nRead;                    /* Number of bytes actually read from file */
  int nRetry = 0;                 /* Number of retrys */

  assert( id!=0 );
  SimulateIOError(return SQLITE_IOERR_READ);
  OSTRACE(("READ %d lock=%d\n", pFile->h, pFile->locktype));

#if SQLITE_OS_WINCE
  if( seekWinFile(pFile, offset) ){
    return SQLITE_FULL;
  }
  while( !osReadFile(pFile->h, pBuf, amt, &nRead, 0) ){
#else
  memset(&overlapped, 0, sizeof(OVERLAPPED));
  overlapped.Offset = (LONG)(offset & 0xffffffff);
  overlapped.OffsetHigh = (LONG)((offset>>32) & 0x7fffffff);
  while( !osReadFile(pFile->h, pBuf, amt, &nRead, &overlapped) &&
         osGetLastError()!=ERROR_HANDLE_EOF ){
#endif
    DWORD lastErrno;
    if( retryIoerr(&nRetry, &lastErrno) ) continue;
    pFile->lastErrno = lastErrno;
    return winLogError(SQLITE_IOERR_READ, pFile->lastErrno,
             "winRead", pFile->zPath);
  }
  logIoerr(nRetry);
................................................................................
*/
static int winWrite(
  sqlite3_file *id,               /* File to write into */
  const void *pBuf,               /* The bytes to be written */
  int amt,                        /* Number of bytes to write */
  sqlite3_int64 offset            /* Offset into the file to begin writing at */
){
  int rc = 0;                     /* True if error has occured, else false */
  winFile *pFile = (winFile*)id;  /* File handle */
  int nRetry = 0;                 /* Number of retries */

  assert( amt>0 );
  assert( pFile );
  SimulateIOError(return SQLITE_IOERR_WRITE);
  SimulateDiskfullError(return SQLITE_FULL);

  OSTRACE(("WRITE %d lock=%d\n", pFile->h, pFile->locktype));

#if SQLITE_OS_WINCE
  rc = seekWinFile(pFile, offset);
  if( rc==0 ){
#else
  {
#endif
#if !SQLITE_OS_WINCE
    OVERLAPPED overlapped;        /* The offset for WriteFile. */
#endif
    u8 *aRem = (u8 *)pBuf;        /* Data yet to be written */
    int nRem = amt;               /* Number of bytes yet to be written */
    DWORD nWrite;                 /* Bytes written by each WriteFile() call */
    DWORD lastErrno = NO_ERROR;   /* Value returned by GetLastError() */

#if !SQLITE_OS_WINCE
    memset(&overlapped, 0, sizeof(OVERLAPPED));
    overlapped.Offset = (LONG)(offset & 0xffffffff);
    overlapped.OffsetHigh = (LONG)((offset>>32) & 0x7fffffff);
#endif

    while( nRem>0 ){
#if SQLITE_OS_WINCE
      if( !osWriteFile(pFile->h, aRem, nRem, &nWrite, 0) ){
#else
      if( !osWriteFile(pFile->h, aRem, nRem, &nWrite, &overlapped) ){
#endif
        if( retryIoerr(&nRetry, &lastErrno) ) continue;
        break;
      }
      if( nWrite<=0 ){
        lastErrno = osGetLastError();
        break;
      }
#if !SQLITE_OS_WINCE
      offset += nWrite;
      overlapped.Offset = (LONG)(offset & 0xffffffff);
      overlapped.OffsetHigh = (LONG)((offset>>32) & 0x7fffffff);
#endif
      aRem += nWrite;
      nRem -= nWrite;
    }
    if( nRem>0 ){
      pFile->lastErrno = lastErrno;
      rc = 1;
    }
................................................................................
  }
  zBuf[j] = 0;
  zBuf[j+1] = 0;

  OSTRACE(("TEMP FILENAME: %s\n", zBuf));
  return SQLITE_OK; 
}

/*
** Return TRUE if the named file is really a directory.  Return false if
** it is something other than a directory, or if there is any kind of memory
** allocation failure.
*/
static int winIsDir(const void *zConverted){
  DWORD attr;
  int rc = 0;
  DWORD lastErrno;

  if( isNT() ){
    int cnt = 0;
    WIN32_FILE_ATTRIBUTE_DATA sAttrData;
    memset(&sAttrData, 0, sizeof(sAttrData));
    while( !(rc = osGetFileAttributesExW((LPCWSTR)zConverted,
                             GetFileExInfoStandard,
                             &sAttrData)) && retryIoerr(&cnt, &lastErrno) ){}
    if( !rc ){
      return 0; /* Invalid name? */
    }
    attr = sAttrData.dwFileAttributes;
#if SQLITE_OS_WINCE==0
  }else{
    attr = osGetFileAttributesA((char*)zConverted);
#endif
  }
  return (attr!=INVALID_FILE_ATTRIBUTES) && (attr&FILE_ATTRIBUTE_DIRECTORY);
}

/*
** Open a file.
*/
static int winOpen(
  sqlite3_vfs *pVfs,        /* Not used */
  const char *zName,        /* Name of the file (UTF-8) */
................................................................................
        zUtf8Name[strlen(zUtf8Name)+1]==0 );

  /* Convert the filename to the system encoding. */
  zConverted = convertUtf8Filename(zUtf8Name);
  if( zConverted==0 ){
    return SQLITE_IOERR_NOMEM;
  }

  if( winIsDir(zConverted) ){
    sqlite3_free(zConverted);
    return SQLITE_CANTOPEN_ISDIR;
  }

  if( isReadWrite ){
    dwDesiredAccess = GENERIC_READ | GENERIC_WRITE;
  }else{
    dwDesiredAccess = GENERIC_READ;
  }

................................................................................
  if( isNT() ){
    while( (h = osCreateFileW((LPCWSTR)zConverted,
                              dwDesiredAccess,
                              dwShareMode, NULL,
                              dwCreationDisposition,
                              dwFlagsAndAttributes,
                              NULL))==INVALID_HANDLE_VALUE &&
                              retryIoerr(&cnt, &lastErrno) ){
               /* Noop */



    }
#if SQLITE_OS_WINCE==0
  }else{
    while( (h = osCreateFileA((LPCSTR)zConverted,
                              dwDesiredAccess,
                              dwShareMode, NULL,
                              dwCreationDisposition,
                              dwFlagsAndAttributes,
                              NULL))==INVALID_HANDLE_VALUE &&
                              retryIoerr(&cnt, &lastErrno) ){
               /* Noop */
    }
#endif
  }

  logIoerr(cnt);

  OSTRACE(("OPEN %d %s 0x%lx %s\n", 
           h, zName, dwDesiredAccess, 
................................................................................
static int winDelete(
  sqlite3_vfs *pVfs,          /* Not used on win32 */
  const char *zFilename,      /* Name of file to delete */
  int syncDir                 /* Not used on win32 */
){
  int cnt = 0;
  int rc;
  DWORD attr;
  DWORD lastErrno;
  void *zConverted;
  UNUSED_PARAMETER(pVfs);
  UNUSED_PARAMETER(syncDir);

  SimulateIOError(return SQLITE_IOERR_DELETE);
  zConverted = convertUtf8Filename(zFilename);
  if( zConverted==0 ){
    return SQLITE_IOERR_NOMEM;
  }
  if( isNT() ){
    do {
      attr = osGetFileAttributesW(zConverted);
      if ( attr==INVALID_FILE_ATTRIBUTES ){
        rc = SQLITE_OK; /* Already gone? */
        break;
      }
      if ( attr&FILE_ATTRIBUTE_DIRECTORY ){
        rc = SQLITE_ERROR; /* Files only. */
        break;
      }
      if ( osDeleteFileW(zConverted) ){
        rc = SQLITE_OK; /* Deleted OK. */
        break;
      }
      if ( !retryIoerr(&cnt, &lastErrno) ){

        rc = SQLITE_ERROR; /* No more retries. */
        break;
      }
    } while(1);
/* isNT() is 1 if SQLITE_OS_WINCE==1, so this else is never executed. 
** Since the ANSI version of these Windows API do not exist for WINCE,
** it's important to not reference them for WINCE builds.
*/
#if SQLITE_OS_WINCE==0
  }else{
    do {
      attr = osGetFileAttributesA(zConverted);
      if ( attr==INVALID_FILE_ATTRIBUTES ){
        rc = SQLITE_OK; /* Already gone? */
        break;
      }
      if ( attr&FILE_ATTRIBUTE_DIRECTORY ){
        rc = SQLITE_ERROR; /* Files only. */
        break;
      }
      if ( osDeleteFileA(zConverted) ){
        rc = SQLITE_OK; /* Deleted OK. */
        break;
      }
      if ( !retryIoerr(&cnt, &lastErrno) ){

        rc = SQLITE_ERROR; /* No more retries. */
        break;
      }
    } while(1);
#endif
  }
  if( rc ){
    rc = winLogError(SQLITE_IOERR_DELETE, lastErrno,
             "winDelete", zFilename);
  }else{
    logIoerr(cnt);
................................................................................
** The number of rowset entries per allocation chunk.
*/
#define ROWSET_ENTRY_PER_CHUNK  \
                       ((ROWSET_ALLOCATION_SIZE-8)/sizeof(struct RowSetEntry))

/*
** Each entry in a RowSet is an instance of the following object.
**
** This same object is reused to store a linked list of trees of RowSetEntry
** objects.  In that alternative use, pRight points to the next entry
** in the list, pLeft points to the tree, and v is unused.  The
** RowSet.pForest value points to the head of this forest list.
*/
struct RowSetEntry {            
  i64 v;                        /* ROWID value for this entry */
  struct RowSetEntry *pRight;   /* Right subtree (larger entries) or list */
  struct RowSetEntry *pLeft;    /* Left subtree (smaller entries) */
};

................................................................................
*/
struct RowSet {
  struct RowSetChunk *pChunk;    /* List of all chunk allocations */
  sqlite3 *db;                   /* The database connection */
  struct RowSetEntry *pEntry;    /* List of entries using pRight */
  struct RowSetEntry *pLast;     /* Last entry on the pEntry list */
  struct RowSetEntry *pFresh;    /* Source of new entry objects */
  struct RowSetEntry *pForest;   /* List of binary trees of entries */
  u16 nFresh;                    /* Number of objects on pFresh */
  u8 rsFlags;                    /* Various flags */
  u8 iBatch;                     /* Current insert batch */
};

/*
** Allowed values for RowSet.rsFlags
*/
#define ROWSET_SORTED  0x01   /* True if RowSet.pEntry is sorted */
#define ROWSET_NEXT    0x02   /* True if sqlite3RowSetNext() has been called */

/*
** Turn bulk memory into a RowSet object.  N bytes of memory
** are available at pSpace.  The db pointer is used as a memory context
** for any subsequent allocations that need to occur.
** Return a pointer to the new RowSet object.
**
** It must be the case that N is sufficient to make a Rowset.  If not
................................................................................
  RowSet *p;
  assert( N >= ROUND8(sizeof(*p)) );
  p = pSpace;
  p->pChunk = 0;
  p->db = db;
  p->pEntry = 0;
  p->pLast = 0;
  p->pForest = 0;
  p->pFresh = (struct RowSetEntry*)(ROUND8(sizeof(*p)) + (char*)p);
  p->nFresh = (u16)((N - ROUND8(sizeof(*p)))/sizeof(struct RowSetEntry));
  p->rsFlags = ROWSET_SORTED;
  p->iBatch = 0;
  return p;
}

/*
** Deallocate all chunks from a RowSet.  This frees all memory that
** the RowSet has allocated over its lifetime.  This routine is
................................................................................
    pNextChunk = pChunk->pNextChunk;
    sqlite3DbFree(p->db, pChunk);
  }
  p->pChunk = 0;
  p->nFresh = 0;
  p->pEntry = 0;
  p->pLast = 0;
  p->pForest = 0;
  p->rsFlags = ROWSET_SORTED;
}

/*
** Allocate a new RowSetEntry object that is associated with the
** given RowSet.  Return a pointer to the new and completely uninitialized
** objected.
**
** In an OOM situation, the RowSet.db->mallocFailed flag is set and this
** routine returns NULL.
*/
static struct RowSetEntry *rowSetEntryAlloc(RowSet *p){
  assert( p!=0 );
  if( p->nFresh==0 ){
    struct RowSetChunk *pNew;
    pNew = sqlite3DbMallocRaw(p->db, sizeof(*pNew));
    if( pNew==0 ){
      return 0;
    }
    pNew->pNextChunk = p->pChunk;
    p->pChunk = pNew;
    p->pFresh = pNew->aEntry;
    p->nFresh = ROWSET_ENTRY_PER_CHUNK;
  }
  p->nFresh--;
  return p->pFresh++;
}

/*
** Insert a new value into a RowSet.
**
** The mallocFailed flag of the database connection is set if a
** memory allocation fails.
*/
SQLITE_PRIVATE void sqlite3RowSetInsert(RowSet *p, i64 rowid){
  struct RowSetEntry *pEntry;  /* The new entry */
  struct RowSetEntry *pLast;   /* The last prior entry */











  /* This routine is never called after sqlite3RowSetNext() */
  assert( p!=0 && (p->rsFlags & ROWSET_NEXT)==0 );



  pEntry = rowSetEntryAlloc(p);
  if( pEntry==0 ) return;
  pEntry->v = rowid;
  pEntry->pRight = 0;
  pLast = p->pLast;
  if( pLast ){
    if( (p->rsFlags & ROWSET_SORTED)!=0 && rowid<=pLast->v ){
      p->rsFlags &= ~ROWSET_SORTED;
    }
    pLast->pRight = pEntry;
  }else{

    p->pEntry = pEntry;
  }
  p->pLast = pEntry;
}

/*
** Merge two lists of RowSetEntry objects.  Remove duplicates.
**
** The input lists are connected via pRight pointers and are 
** assumed to each already be in sorted order.
*/
static struct RowSetEntry *rowSetEntryMerge(
  struct RowSetEntry *pA,    /* First sorted list to be merged */
  struct RowSetEntry *pB     /* Second sorted list to be merged */
){
  struct RowSetEntry head;
  struct RowSetEntry *pTail;

  pTail = &head;
................................................................................
    assert( pB==0 || pB->pRight==0 || pB->v<=pB->pRight->v );
    pTail->pRight = pB;
  }
  return head.pRight;
}

/*
** Sort all elements on the list of RowSetEntry objects into order of
** increasing v.
*/ 

static struct RowSetEntry *rowSetEntrySort(struct RowSetEntry *pIn){
  unsigned int i;
  struct RowSetEntry *pNext, *aBucket[40];



  memset(aBucket, 0, sizeof(aBucket));
  while( pIn ){

    pNext = pIn->pRight;
    pIn->pRight = 0;
    for(i=0; aBucket[i]; i++){
      pIn = rowSetEntryMerge(aBucket[i], pIn);
      aBucket[i] = 0;
    }
    aBucket[i] = pIn;
    pIn = pNext;
  }
  pIn = 0;
  for(i=0; i<sizeof(aBucket)/sizeof(aBucket[0]); i++){

    pIn = rowSetEntryMerge(pIn, aBucket[i]);
  }



  return pIn;
}


/*
** The input, pIn, is a binary tree (or subtree) of RowSetEntry objects.
** Convert this tree into a linked list connected by the pRight pointers
** and return pointers to the first and last elements of the new list.
................................................................................
    p->pLeft = pLeft;
    p->pRight = rowSetNDeepTree(&pList, iDepth);
  }
  return p;
}

/*
** Take all the entries on p->pEntry and on the trees in p->pForest and
** sort them all together into one big ordered list on p->pEntry.
**
** This routine should only be called once in the life of a RowSet.
*/
static void rowSetToList(RowSet *p){



  /* This routine is called only once */
  assert( p!=0 && (p->rsFlags & ROWSET_NEXT)==0 );

  if( (p->rsFlags & ROWSET_SORTED)==0 ){
    p->pEntry = rowSetEntrySort(p->pEntry);
  }

  /* While this module could theoretically support it, sqlite3RowSetNext()
  ** is never called after sqlite3RowSetText() for the same RowSet.  So
  ** there is never a forest to deal with.  Should this change, simply
  ** remove the assert() and the #if 0. */
  assert( p->pForest==0 );
#if 0
  while( p->pForest ){
    struct RowSetEntry *pTree = p->pForest->pLeft;
    if( pTree ){
      struct RowSetEntry *pHead, *pTail;
      rowSetTreeToList(pTree, &pHead, &pTail);

      p->pEntry = rowSetEntryMerge(p->pEntry, pHead);
    }
    p->pForest = p->pForest->pRight;
  }
#endif
  p->rsFlags |= ROWSET_NEXT;  /* Verify this routine is never called again */
}

/*
** Extract the smallest element from the RowSet.
** Write the element into *pRowid.  Return 1 on success.  Return
** 0 if the RowSet is already empty.
**
** After this routine has been called, the sqlite3RowSetInsert()
** routine may not be called again.  
*/
SQLITE_PRIVATE int sqlite3RowSetNext(RowSet *p, i64 *pRowid){
  assert( p!=0 );

  /* Merge the forest into a single sorted list on first call */
  if( (p->rsFlags & ROWSET_NEXT)==0 ) rowSetToList(p);

  /* Return the next entry on the list */
  if( p->pEntry ){
    *pRowid = p->pEntry->v;
    p->pEntry = p->pEntry->pRight;
    if( p->pEntry==0 ){
      sqlite3RowSetClear(p);
    }
    return 1;
................................................................................
    return 0;
  }
}

/*
** Check to see if element iRowid was inserted into the the rowset as
** part of any insert batch prior to iBatch.  Return 1 or 0.
**
** If this is the first test of a new batch and if there exist entires
** on pRowSet->pEntry, then sort those entires into the forest at
** pRowSet->pForest so that they can be tested.
*/
SQLITE_PRIVATE int sqlite3RowSetTest(RowSet *pRowSet, u8 iBatch, sqlite3_int64 iRowid){
  struct RowSetEntry *p, *pTree;

  /* This routine is never called after sqlite3RowSetNext() */
  assert( pRowSet!=0 && (pRowSet->rsFlags & ROWSET_NEXT)==0 );

  /* Sort entries into the forest on the first test of a new batch 
  */
  if( iBatch!=pRowSet->iBatch ){
    p = pRowSet->pEntry;

    if( p ){
      struct RowSetEntry **ppPrevTree = &pRowSet->pForest;
      if( (pRowSet->rsFlags & ROWSET_SORTED)==0 ){
        p = rowSetEntrySort(p);
      }
      for(pTree = pRowSet->pForest; pTree; pTree=pTree->pRight){
        ppPrevTree = &pTree->pRight;
        if( pTree->pLeft==0 ){
          pTree->pLeft = rowSetListToTree(p);
          break;
        }else{
          struct RowSetEntry *pAux, *pTail;
          rowSetTreeToList(pTree->pLeft, &pAux, &pTail);
          pTree->pLeft = 0;
          p = rowSetEntryMerge(pAux, p);
        }
      }
      if( pTree==0 ){
        *ppPrevTree = pTree = rowSetEntryAlloc(pRowSet);
        if( pTree ){
          pTree->v = 0;
          pTree->pRight = 0;
          pTree->pLeft = rowSetListToTree(p);
        }
      }
      pRowSet->pEntry = 0;
      pRowSet->pLast = 0;
      pRowSet->rsFlags |= ROWSET_SORTED;
    }
    pRowSet->iBatch = iBatch;
  }


  /* Test to see if the iRowid value appears anywhere in the forest.
  ** Return 1 if it does and 0 if not.
  */
  for(pTree = pRowSet->pForest; pTree; pTree=pTree->pRight){
    p = pTree->pLeft;
    while( p ){
      if( p->v<iRowid ){
        p = p->pRight;
      }else if( p->v>iRowid ){
        p = p->pLeft;
      }else{
        return 1;
      }
    }
  }
  return 0;
}

/************** End of rowset.c **********************************************/
/************** Begin file pager.c *******************************************/
................................................................................
  int pageSize;               /* Number of bytes in a page */
  Pgno mxPgno;                /* Maximum allowed size of the database */
  i64 journalSizeLimit;       /* Size limit for persistent journal files */
  char *zFilename;            /* Name of the database file */
  char *zJournal;             /* Name of the journal file */
  int (*xBusyHandler)(void*); /* Function to call when busy */
  void *pBusyHandlerArg;      /* Context argument for xBusyHandler */
  int aStat[3];               /* Total cache hits, misses and writes */
#ifdef SQLITE_TEST
  int nRead;                  /* Database pages read */
#endif
  void (*xReiniter)(DbPage*); /* Call this routine when reloading pages */
#ifdef SQLITE_HAS_CODEC
  void *(*xCodec)(void*,void*,Pgno,int); /* Routine for en/decoding data */
  void (*xCodecSizeChng)(void*,int,int); /* Notify of page size changes */
  void (*xCodecFree)(void*);             /* Destructor for the codec */
  void *pCodec;               /* First argument to xCodec... methods */
................................................................................
  PCache *pPCache;            /* Pointer to page cache object */
#ifndef SQLITE_OMIT_WAL
  Wal *pWal;                  /* Write-ahead log used by "journal_mode=wal" */
  char *zWal;                 /* File name for write-ahead log */
#endif
};

/*
** Indexes for use with Pager.aStat[]. The Pager.aStat[] array contains
** the values accessed by passing SQLITE_DBSTATUS_CACHE_HIT, CACHE_MISS 
** or CACHE_WRITE to sqlite3_db_status().
*/
#define PAGER_STAT_HIT   0
#define PAGER_STAT_MISS  1
#define PAGER_STAT_WRITE 2

/*
** The following global variables hold counters used for
** testing purposes only.  These variables do not exist in
** a non-testing build.  These variables are not thread-safe.
*/
#ifdef SQLITE_TEST
SQLITE_API int sqlite3_pager_readdb_count = 0;    /* Number of full pages read from DB */
................................................................................
static int pagerWalFrames(
  Pager *pPager,                  /* Pager object */
  PgHdr *pList,                   /* List of frames to log */
  Pgno nTruncate,                 /* Database size after this commit */
  int isCommit                    /* True if this is a commit */
){
  int rc;                         /* Return code */
  int nList;                      /* Number of pages in pList */
#if defined(SQLITE_DEBUG) || defined(SQLITE_CHECK_PAGES)
  PgHdr *p;                       /* For looping over pages */
#endif

  assert( pPager->pWal );
  assert( pList );
#ifdef SQLITE_DEBUG
  /* Verify that the page list is in accending order */
  for(p=pList; p && p->pDirty; p=p->pDirty){
    assert( p->pgno < p->pDirty->pgno );
  }
#endif

  assert( pList->pDirty==0 || isCommit );
  if( isCommit ){
    /* If a WAL transaction is being committed, there is no point in writing
    ** any pages with page numbers greater than nTruncate into the WAL file.
    ** They will never be read by any client. So remove them from the pDirty
    ** list here. */
    PgHdr *p;
    PgHdr **ppNext = &pList;
    nList = 0;
    for(p=pList; (*ppNext = p)!=0; p=p->pDirty){
      if( p->pgno<=nTruncate ){
        ppNext = &p->pDirty;
        nList++;
      }
    }
    assert( pList );
  }else{
    nList = 1;
  }
  pPager->aStat[PAGER_STAT_WRITE] += nList;

  if( pList->pgno==1 ) pager_write_changecounter(pList);
  rc = sqlite3WalFrames(pPager->pWal, 
      pPager->pageSize, pList, nTruncate, isCommit, pPager->walSyncFlags
  );
  if( rc==SQLITE_OK && pPager->pBackup ){
    PgHdr *p;
................................................................................
      */
      if( pgno==1 ){
        memcpy(&pPager->dbFileVers, &pData[24], sizeof(pPager->dbFileVers));
      }
      if( pgno>pPager->dbFileSize ){
        pPager->dbFileSize = pgno;
      }
      pPager->aStat[PAGER_STAT_WRITE]++;

      /* Update any backup objects copying the contents of this pager. */
      sqlite3BackupUpdate(pPager->pBackup, pgno, (u8*)pList->pData);

      PAGERTRACE(("STORE %d page %d hash(%08x)\n",
                   PAGERID(pPager), pgno, pager_pagehash(pList)));
      IOTRACE(("PGOUT %p %d\n", pPager, pgno));
      PAGER_INCR(sqlite3_pager_writedb_count);

    }else{
      PAGERTRACE(("NOSTORE %d page %d\n", PAGERID(pPager), pgno));
    }
    pager_set_pagehash(pList);
    pList = pList->pDirty;
  }

................................................................................
  assert( (*ppPage)->pgno==pgno );
  assert( (*ppPage)->pPager==pPager || (*ppPage)->pPager==0 );

  if( (*ppPage)->pPager && !noContent ){
    /* In this case the pcache already contains an initialized copy of
    ** the page. Return without further ado.  */
    assert( pgno<=PAGER_MAX_PGNO && pgno!=PAGER_MJ_PGNO(pPager) );
    pPager->aStat[PAGER_STAT_HIT]++;
    return SQLITE_OK;

  }else{
    /* The pager cache has created a new page. Its content needs to 
    ** be initialized.  */

    pPg = *ppPage;
................................................................................
        testcase( rc==SQLITE_NOMEM );
        sqlite3EndBenignMalloc();
      }
      memset(pPg->pData, 0, pPager->pageSize);
      IOTRACE(("ZERO %p %d\n", pPager, pgno));
    }else{
      assert( pPg->pPager==pPager );
      pPager->aStat[PAGER_STAT_MISS]++;
      rc = readDbPage(pPg);
      if( rc!=SQLITE_OK ){
        goto pager_acquire_err;
      }
    }
    pager_set_pagehash(pPg);
  }
................................................................................
      /* If running in direct mode, write the contents of page 1 to the file. */
      if( DIRECT_MODE ){
        const void *zBuf;
        assert( pPager->dbFileSize>0 );
        CODEC2(pPager, pPgHdr->pData, 1, 6, rc=SQLITE_NOMEM, zBuf);
        if( rc==SQLITE_OK ){
          rc = sqlite3OsWrite(pPager->fd, zBuf, pPager->pageSize, 0);
          pPager->aStat[PAGER_STAT_WRITE]++;
        }
        if( rc==SQLITE_OK ){
          pPager->changeCountDone = 1;
        }
      }else{
        pPager->changeCountDone = 1;
      }
................................................................................
  static int a[11];
  a[0] = sqlite3PcacheRefCount(pPager->pPCache);
  a[1] = sqlite3PcachePagecount(pPager->pPCache);
  a[2] = sqlite3PcacheGetCachesize(pPager->pPCache);
  a[3] = pPager->eState==PAGER_OPEN ? -1 : (int) pPager->dbSize;
  a[4] = pPager->eState;
  a[5] = pPager->errCode;
  a[6] = pPager->aStat[PAGER_STAT_HIT];
  a[7] = pPager->aStat[PAGER_STAT_MISS];
  a[8] = 0;  /* Used to be pPager->nOvfl */
  a[9] = pPager->nRead;
  a[10] = pPager->aStat[PAGER_STAT_WRITE];
  return a;
}
#endif

/*
** Parameter eStat must be either SQLITE_DBSTATUS_CACHE_HIT or
** SQLITE_DBSTATUS_CACHE_MISS. Before returning, *pnVal is incremented by the
** current cache hit or miss count, according to the value of eStat. If the 
** reset parameter is non-zero, the cache hit or miss count is zeroed before 
** returning.
*/
SQLITE_PRIVATE void sqlite3PagerCacheStat(Pager *pPager, int eStat, int reset, int *pnVal){


  assert( eStat==SQLITE_DBSTATUS_CACHE_HIT
       || eStat==SQLITE_DBSTATUS_CACHE_MISS
       || eStat==SQLITE_DBSTATUS_CACHE_WRITE
  );





  assert( SQLITE_DBSTATUS_CACHE_HIT+1==SQLITE_DBSTATUS_CACHE_MISS );
  assert( SQLITE_DBSTATUS_CACHE_HIT+2==SQLITE_DBSTATUS_CACHE_WRITE );
  assert( PAGER_STAT_HIT==0 && PAGER_STAT_MISS==1 && PAGER_STAT_WRITE==2 );

  *pnVal += pPager->aStat[eStat - SQLITE_DBSTATUS_CACHE_HIT];
  if( reset ){
    pPager->aStat[eStat - SQLITE_DBSTATUS_CACHE_HIT] = 0;
  }
}

/*
** Return true if this is an in-memory pager.
*/
SQLITE_PRIVATE int sqlite3PagerIsMemdb(Pager *pPager){
................................................................................
#define ISAUTOVACUUM 0
#endif


/*
** This structure is passed around through all the sanity checking routines
** in order to keep track of some global state information.
**
** The aRef[] array is allocated so that there is 1 bit for each page in
** the database. As the integrity-check proceeds, for each page used in
** the database the corresponding bit is set. This allows integrity-check to 
** detect pages that are used twice and orphaned pages (both of which 
** indicate corruption).
*/
typedef struct IntegrityCk IntegrityCk;
struct IntegrityCk {
  BtShared *pBt;    /* The tree being checked out */
  Pager *pPager;    /* The associated pager.  Also accessible by pBt->pPager */
  u8 *aPgRef;       /* 1 bit per page in the db (see above) */
  Pgno nPage;       /* Number of pages in the database */
  int mxErr;        /* Stop accumulating errors when this reaches zero */
  int nErr;         /* Number of messages written to zErrMsg so far */
  int mallocFailed; /* A memory allocation error has occurred */
  StrAccum errMsg;  /* Accumulate the error message text here */
};

................................................................................
  /* Assert that the caller has been consistent. If this cursor was opened
  ** expecting an index b-tree, then the caller should be inserting blob
  ** keys with no associated data. If the cursor was opened expecting an
  ** intkey table, the caller should be inserting integer keys with a
  ** blob of associated data.  */
  assert( (pKey==0)==(pCur->pKeyInfo==0) );








  /* Save the positions of any other cursors open on this table.
  **
  ** In some cases, the call to btreeMoveto() below is a no-op. For
  ** example, when inserting data into a table with auto-generated integer
  ** keys, the VDBE layer invokes sqlite3BtreeLast() to figure out the 
  ** integer key to use. It then calls this function to actually insert the 
  ** data into the intkey B-Tree. In this case btreeMoveto() recognizes
  ** that the cursor is already where it needs to be and returns without
  ** doing any work. To avoid thwarting these optimizations, it is important
  ** not to clear the cursor here.
  */
  rc = saveAllCursors(pBt, pCur->pgnoRoot, pCur);
  if( rc ) return rc;

  /* If this is an insert into a table b-tree, invalidate any incrblob 
  ** cursors open on the row being replaced (assuming this is a replace
  ** operation - if it is not, the following is a no-op).  */
  if( pCur->pKeyInfo==0 ){
    invalidateIncrblobCursors(p, nKey, 0);
  }

  if( !loc ){
    rc = btreeMoveto(pCur, pKey, nKey, appendBias, &loc);
    if( rc ) return rc;
  }
  assert( pCur->eState==CURSOR_VALID || (pCur->eState==CURSOR_INVALID && loc) );

  pPage = pCur->apPage[pCur->iPage];
................................................................................

  if( NEVER(pCur->aiIdx[pCur->iPage]>=pCur->apPage[pCur->iPage]->nCell) 
   || NEVER(pCur->eState!=CURSOR_VALID)
  ){
    return SQLITE_ERROR;  /* Something has gone awry. */
  }







  iCellDepth = pCur->iPage;
  iCellIdx = pCur->aiIdx[iCellDepth];
  pPage = pCur->apPage[iCellDepth];
  pCell = findCell(pPage, iCellIdx);

  /* If the page containing the entry to delete is not a leaf page, move
  ** the cursor to the largest entry in the tree that is smaller than
................................................................................
  /* Save the positions of any other cursors open on this table before
  ** making any modifications. Make the page containing the entry to be 
  ** deleted writable. Then free any overflow pages associated with the 
  ** entry and finally remove the cell itself from within the page.  
  */
  rc = saveAllCursors(pBt, pCur->pgnoRoot, pCur);
  if( rc ) return rc;

  /* If this is a delete operation to remove a row from a table b-tree,
  ** invalidate any incrblob cursors open on the row being deleted.  */
  if( pCur->pKeyInfo==0 ){
    invalidateIncrblobCursors(p, pCur->info.nKey, 0);
  }

  rc = sqlite3PagerWrite(pPage->pDbPage);
  if( rc ) return rc;
  rc = clearCell(pPage, pCell);
  dropCell(pPage, iCellIdx, cellSizePtr(pPage, pCell), &rc);
  if( rc ) return rc;

  /* If the cell deleted was not located on a leaf page, then the cursor
................................................................................
*/
SQLITE_PRIVATE int sqlite3BtreeClearTable(Btree *p, int iTable, int *pnChange){
  int rc;
  BtShared *pBt = p->pBt;
  sqlite3BtreeEnter(p);
  assert( p->inTrans==TRANS_WRITE );

  rc = saveAllCursors(pBt, (Pgno)iTable, 0);

  if( SQLITE_OK==rc ){
    /* Invalidate all incrblob cursors open on table iTable (assuming iTable
    ** is the root of a table b-tree - if it is not, the following call is
    ** a no-op).  */
    invalidateIncrblobCursors(p, 0, 1);



    rc = clearDatabasePage(pBt, (Pgno)iTable, 0, pnChange);
  }
  sqlite3BtreeLeave(p);
  return rc;
}

/*
................................................................................
  if( pCheck->errMsg.mallocFailed ){
    pCheck->mallocFailed = 1;
  }
}
#endif /* SQLITE_OMIT_INTEGRITY_CHECK */

#ifndef SQLITE_OMIT_INTEGRITY_CHECK

/*
** Return non-zero if the bit in the IntegrityCk.aPgRef[] array that
** corresponds to page iPg is already set.
*/
static int getPageReferenced(IntegrityCk *pCheck, Pgno iPg){
  assert( iPg<=pCheck->nPage && sizeof(pCheck->aPgRef[0])==1 );
  return (pCheck->aPgRef[iPg/8] & (1 << (iPg & 0x07)));
}

/*
** Set the bit in the IntegrityCk.aPgRef[] array that corresponds to page iPg.
*/
static void setPageReferenced(IntegrityCk *pCheck, Pgno iPg){
  assert( iPg<=pCheck->nPage && sizeof(pCheck->aPgRef[0])==1 );
  pCheck->aPgRef[iPg/8] |= (1 << (iPg & 0x07));
}


/*
** Add 1 to the reference count for page iPage.  If this is the second
** reference to the page, add an error message to pCheck->zErrMsg.
** Return 1 if there are 2 ore more references to the page and 0 if
** if this is the first reference to the page.
**
** Also check that the page number is in bounds.
................................................................................
*/
static int checkRef(IntegrityCk *pCheck, Pgno iPage, char *zContext){
  if( iPage==0 ) return 1;
  if( iPage>pCheck->nPage ){
    checkAppendMsg(pCheck, zContext, "invalid page number %d", iPage);
    return 1;
  }
  if( getPageReferenced(pCheck, iPage) ){
    checkAppendMsg(pCheck, zContext, "2nd reference to page %d", iPage);
    return 1;
  }
  setPageReferenced(pCheck, iPage);
  return 0;
}

#ifndef SQLITE_OMIT_AUTOVACUUM
/*
** Check that the entry in the pointer-map for page iChild maps to 
** page iParent, pointer type ptrType. If not, append an error message
** to pCheck.
................................................................................
  sCheck.nErr = 0;
  sCheck.mallocFailed = 0;
  *pnErr = 0;
  if( sCheck.nPage==0 ){
    sqlite3BtreeLeave(p);
    return 0;
  }

  sCheck.aPgRef = sqlite3MallocZero((sCheck.nPage / 8)+ 1);
  if( !sCheck.aPgRef ){
    *pnErr = 1;
    sqlite3BtreeLeave(p);
    return 0;
  }

  i = PENDING_BYTE_PAGE(pBt);
  if( i<=sCheck.nPage ) setPageReferenced(&sCheck, i);


  sqlite3StrAccumInit(&sCheck.errMsg, zErr, sizeof(zErr), 20000);
  sCheck.errMsg.useMalloc = 2;

  /* Check the integrity of the freelist
  */
  checkList(&sCheck, 1, get4byte(&pBt->pPage1->aData[32]),
            get4byte(&pBt->pPage1->aData[36]), "Main freelist: ");
................................................................................
    checkTreePage(&sCheck, aRoot[i], "List of tree roots: ", NULL, NULL);
  }

  /* Make sure every page in the file is referenced
  */
  for(i=1; i<=sCheck.nPage && sCheck.mxErr; i++){
#ifdef SQLITE_OMIT_AUTOVACUUM
    if( getPageReferenced(&sCheck, i)==0 ){
      checkAppendMsg(&sCheck, 0, "Page %d is never used", i);
    }
#else
    /* If the database supports auto-vacuum, make sure no tables contain
    ** references to pointer-map pages.
    */
    if( getPageReferenced(&sCheck, i)==0 && 
       (PTRMAP_PAGENO(pBt, i)!=i || !pBt->autoVacuum) ){
      checkAppendMsg(&sCheck, 0, "Page %d is never used", i);
    }
    if( getPageReferenced(&sCheck, i)!=0 && 
       (PTRMAP_PAGENO(pBt, i)==i && pBt->autoVacuum) ){
      checkAppendMsg(&sCheck, 0, "Pointer map page %d is referenced", i);
    }
#endif
  }

  /* Make sure this analysis did not leave any unref() pages.
................................................................................
      nRef, sqlite3PagerRefcount(pBt->pPager)
    );
  }

  /* Clean  up and report errors.
  */
  sqlite3BtreeLeave(p);
  sqlite3_free(sCheck.aPgRef);
  if( sCheck.mallocFailed ){
    sqlite3StrAccumReset(&sCheck.errMsg);
    *pnErr = sCheck.nErr+1;
    return 0;
  }
  *pnErr = sCheck.nErr;
  if( sCheck.nErr==0 ) sqlite3StrAccumReset(&sCheck.errMsg);
................................................................................
#endif
}

/*
** Make sure pMem->z points to a writable allocation of at least 
** n bytes.
**

** If the third argument passed to this function is true, then memory
** cell pMem must contain a string or blob. In this case the content is
** preserved. Otherwise, if the third parameter to this function is false,
** any current string or blob value may be discarded.
**
** This function sets the MEM_Dyn flag and clears any xDel callback.
** It also clears MEM_Ephem and MEM_Static. If the preserve flag is 
** not set, Mem.n is zeroed.
*/
SQLITE_PRIVATE int sqlite3VdbeMemGrow(Mem *pMem, int n, int preserve){
  assert( 1 >=
    ((pMem->zMalloc && pMem->zMalloc==pMem->z) ? 1 : 0) +
    (((pMem->flags&MEM_Dyn)&&pMem->xDel) ? 1 : 0) + 
    ((pMem->flags&MEM_Ephem) ? 1 : 0) + 
    ((pMem->flags&MEM_Static) ? 1 : 0)
  );
  assert( (pMem->flags&MEM_RowSet)==0 );

  /* If the preserve flag is set to true, then the memory cell must already
  ** contain a valid string or blob value.  */
  assert( preserve==0 || pMem->flags&(MEM_Blob|MEM_Str) );

  if( n<32 ) n = 32;
  if( sqlite3DbMallocSize(pMem->db, pMem->zMalloc)<n ){
    if( preserve && pMem->z==pMem->zMalloc ){
      pMem->z = pMem->zMalloc = sqlite3DbReallocOrFree(pMem->db, pMem->z, n);
      preserve = 0;
    }else{
................................................................................
      */
      if( pOp->p4type==P4_SUBPROGRAM ){
        int nByte = (nSub+1)*sizeof(SubProgram*);
        int j;
        for(j=0; j<nSub; j++){
          if( apSub[j]==pOp->p4.pProgram ) break;
        }
        if( j==nSub && SQLITE_OK==sqlite3VdbeMemGrow(pSub, nByte, nSub!=0) ){
          apSub = (SubProgram **)pSub->z;
          apSub[nSub++] = pOp->p4.pProgram;
          pSub->flags |= MEM_Blob;
          pSub->n = nSub*sizeof(SubProgram*);
        }
      }
    }
................................................................................
** if the P4 argument is a P4_MEM use the value of the P4 argument as
** the result.
**
** If the OPFLAG_CLEARCACHE bit is set on P5 and P1 is a pseudo-table cursor,
** then the cache of the cursor is reset prior to extracting the column.
** The first OP_Column against a pseudo-table after the value of the content
** register has changed should have this bit set.
**
** If the OPFLAG_LENGTHARG and OPFLAG_TYPEOFARG bits are set on P5 when
** the result is guaranteed to only be used as the argument of a length()
** or typeof() function, respectively.  The loading of large blobs can be
** skipped for length() and all content loading can be skipped for typeof().
*/
case OP_Column: {
#if 0  /* local variables moved into u.an */
  u32 payloadSize;   /* Number of bytes in the record */
  i64 payloadSize64; /* Number of bytes in the record */
  int p1;            /* P1 value of the opcode */
  int p2;            /* column number to retrieve */
................................................................................
      if( u.an.payloadSize <= (u32)u.an.avail ){
        u.an.zRec = u.an.zData;
        u.an.pC->aRow = (u8*)u.an.zData;
      }else{
        u.an.pC->aRow = 0;
      }
    }
    /* The following assert is true in all cases except when
    ** the database file has been corrupted externally.
    **    assert( u.an.zRec!=0 || u.an.avail>=u.an.payloadSize || u.an.avail>=9 ); */
    u.an.szHdr = getVarint32((u8*)u.an.zData, u.an.offset);

    /* Make sure a corrupt database has not given us an oversize header.
    ** Do this now to avoid an oversize memory allocation.
    **
................................................................................
        u.an.szField = sqlite3VdbeSerialTypeLen(u.an.t);
        u.an.offset += u.an.szField;
        if( u.an.offset<u.an.szField ){  /* True if u.an.offset overflows */
          u.an.zIdx = &u.an.zEndHdr[1];  /* Forces SQLITE_CORRUPT return below */
          break;
        }
      }else{
        /* If u.an.i is less that u.an.nField, then there are fewer fields in this
        ** record than SetNumColumns indicated there are columns in the
        ** table. Set the u.an.offset for any extra columns not present in
        ** the record to 0. This tells code below to store the default value
        ** for the column instead of deserializing a value from the record.
        */
        u.an.aOffset[u.an.i] = 0;
      }
    }
    sqlite3VdbeMemRelease(&u.an.sMem);
    u.an.sMem.flags = MEM_Null;

................................................................................
  ** then there are not enough fields in the record to satisfy the
  ** request.  In this case, set the value NULL or to P4 if P4 is
  ** a pointer to a Mem object.
  */
  if( u.an.aOffset[u.an.p2] ){
    assert( rc==SQLITE_OK );
    if( u.an.zRec ){
      /* This is the common case where the whole row fits on a single page */
      VdbeMemRelease(u.an.pDest);
      sqlite3VdbeSerialGet((u8 *)&u.an.zRec[u.an.aOffset[u.an.p2]], u.an.aType[u.an.p2], u.an.pDest);
    }else{
      /* This branch happens only when the row overflows onto multiple pages */
      u.an.t = u.an.aType[u.an.p2];
      if( (pOp->p5 & (OPFLAG_LENGTHARG|OPFLAG_TYPEOFARG))!=0
       && ((u.an.t>=12 && (u.an.t&1)==0) || (pOp->p5 & OPFLAG_TYPEOFARG)!=0)
      ){
        /* Content is irrelevant for the typeof() function and for
        ** the length(X) function if X is a blob.  So we might as well use
        ** bogus content rather than reading content from disk.  NULL works
        ** for text and blob and whatever is in the u.an.payloadSize64 variable
        ** will work for everything else. */
        u.an.zData = u.an.t<12 ? (char*)&u.an.payloadSize64 : 0;
      }else{
        u.an.len = sqlite3VdbeSerialTypeLen(u.an.t);
        sqlite3VdbeMemMove(&u.an.sMem, u.an.pDest);
        rc = sqlite3VdbeMemFromBtree(u.an.pCrsr, u.an.aOffset[u.an.p2], u.an.len,  u.an.pC->isIndex,
                                     &u.an.sMem);
        if( rc!=SQLITE_OK ){
          goto op_column_out;
        }
        u.an.zData = u.an.sMem.z;
      }
      sqlite3VdbeSerialGet((u8*)u.an.zData, u.an.t, u.an.pDest);
    }
    u.an.pDest->enc = encoding;
  }else{
    if( pOp->p4type==P4_MEM ){
      sqlite3VdbeMemShallowCopy(u.an.pDest, pOp->p4.pMem, MEM_Static);
    }else{
      MemSetTypeFlag(u.an.pDest, MEM_Null);
................................................................................
          p->rc = rc = SQLITE_BUSY;
          goto vdbe_return;
        }
        db->isTransactionSavepoint = 0;
        rc = p->rc;
      }else{
        u.ar.iSavepoint = db->nSavepoint - u.ar.iSavepoint - 1;
        if( u.ar.p1==SAVEPOINT_ROLLBACK ){
          for(u.ar.ii=0; u.ar.ii<db->nDb; u.ar.ii++){
            sqlite3BtreeTripAllCursors(db->aDb[u.ar.ii].pBt, SQLITE_ABORT);
          }
        }
        for(u.ar.ii=0; u.ar.ii<db->nDb; u.ar.ii++){
          rc = sqlite3BtreeSavepoint(db->aDb[u.ar.ii].pBt, u.ar.p1, u.ar.iSavepoint);
          if( rc!=SQLITE_OK ){
            goto abort_due_to_error;
          }
        }
................................................................................

      testcase( pExpr->op==TK_CONST_FUNC );
      assert( !ExprHasProperty(pExpr, EP_xIsSelect) );
      zId = pExpr->u.zToken;
      nId = sqlite3Strlen30(zId);
      pDef = sqlite3FindFunction(pParse->db, zId, nId, n, enc, 0);
      if( pDef==0 ){
        pDef = sqlite3FindFunction(pParse->db, zId, nId, -2, enc, 0);
        if( pDef==0 ){
          no_such_func = 1;
        }else{
          wrong_num_args = 1;
        }
      }else{
        is_agg = pDef->xFunc==0;
................................................................................
*/
static int resolveOrderGroupBy(
  NameContext *pNC,     /* The name context of the SELECT statement */
  Select *pSelect,      /* The SELECT statement holding pOrderBy */
  ExprList *pOrderBy,   /* An ORDER BY or GROUP BY clause to resolve */
  const char *zType     /* Either "ORDER" or "GROUP", as appropriate */
){
  int i, j;                      /* Loop counters */
  int iCol;                      /* Column number */
  struct ExprList_item *pItem;   /* A term of the ORDER BY clause */
  Parse *pParse;                 /* Parsing context */
  int nResult;                   /* Number of terms in the result set */

  if( pOrderBy==0 ) return 0;
  nResult = pSelect->pEList->nExpr;
................................................................................
      continue;
    }

    /* Otherwise, treat the ORDER BY term as an ordinary expression */
    pItem->iOrderByCol = 0;
    if( sqlite3ResolveExprNames(pNC, pE) ){
      return 1;
    }
    for(j=0; j<pSelect->pEList->nExpr; j++){
      if( sqlite3ExprCompare(pE, pSelect->pEList->a[j].pExpr)==0 ){
        pItem->iOrderByCol = j+1;
      }
    }
  }
  return sqlite3ResolveOrderGroupBy(pParse, pSelect, pOrderBy, zType);
}

/*
** Resolve names in the SELECT statement p and all of its descendents.
................................................................................
SQLITE_PRIVATE Expr *sqlite3PExpr(
  Parse *pParse,          /* Parsing context */
  int op,                 /* Expression opcode */
  Expr *pLeft,            /* Left operand */
  Expr *pRight,           /* Right operand */
  const Token *pToken     /* Argument token */
){
  Expr *p;
  if( op==TK_AND && pLeft && pRight ){
    /* Take advantage of short-circuit false optimization for AND */
    p = sqlite3ExprAnd(pParse->db, pLeft, pRight);
  }else{
    p = sqlite3ExprAlloc(pParse->db, op, pToken, 1);
    sqlite3ExprAttachSubtrees(pParse->db, p, pLeft, pRight);
  }
  if( p ) {
    sqlite3ExprCheckHeight(pParse, p->nHeight);
  }
  return p;
}

/*
** Return 1 if an expression must be FALSE in all cases and 0 if the
** expression might be true.  This is an optimization.  If is OK to
** return 0 here even if the expression really is always false (a 
** false negative).  But it is a bug to return 1 if the expression
** might be true in some rare circumstances (a false positive.)
**
** Note that if the expression is part of conditional for a
** LEFT JOIN, then we cannot determine at compile-time whether or not
** is it true or false, so always return 0.
*/
static int exprAlwaysFalse(Expr *p){
  int v = 0;
  if( ExprHasProperty(p, EP_FromJoin) ) return 0;
  if( !sqlite3ExprIsInteger(p, &v) ) return 0;
  return v==0;
}

/*
** Join two expressions using an AND operator.  If either expression is
** NULL, then just return the other expression.
**
** If one side or the other of the AND is known to be false, then instead
** of returning an AND expression, just return a constant expression with
** a value of false.
*/
SQLITE_PRIVATE Expr *sqlite3ExprAnd(sqlite3 *db, Expr *pLeft, Expr *pRight){
  if( pLeft==0 ){
    return pRight;
  }else if( pRight==0 ){
    return pLeft;
  }else if( exprAlwaysFalse(pLeft) || exprAlwaysFalse(pRight) ){
    sqlite3ExprDelete(db, pLeft);
    sqlite3ExprDelete(db, pRight);
    return sqlite3ExprAlloc(db, TK_INTEGER, &sqlite3IntTokens[0], 0);
  }else{
    Expr *pNew = sqlite3ExprAlloc(db, TK_AND, 0, 0);
    sqlite3ExprAttachSubtrees(db, pNew, pLeft, pRight);
    return pNew;
  }
}

................................................................................
  /* First replace any existing entry.
  **
  ** Actually, the way the column cache is currently used, we are guaranteed
  ** that the object will never already be in cache.  Verify this guarantee.
  */
#ifndef NDEBUG
  for(i=0, p=pParse->aColCache; i<SQLITE_N_COLCACHE; i++, p++){









    assert( p->iReg==0 || p->iTable!=iTab || p->iColumn!=iCol );
  }
#endif

  /* Find an empty slot and replace it */
  for(i=0, p=pParse->aColCache; i<SQLITE_N_COLCACHE; i++, p++){
    if( p->iReg==0 ){
................................................................................
** is called.  If iColumn<0 then code is generated that extracts the rowid.
*/
SQLITE_PRIVATE int sqlite3ExprCodeGetColumn(
  Parse *pParse,   /* Parsing and code generating context */
  Table *pTab,     /* Description of the table we are reading from */
  int iColumn,     /* Index of the table column */
  int iTable,      /* The cursor pointing to the table */
  int iReg,        /* Store results here */
  u8 p5            /* P5 value for OP_Column */
){
  Vdbe *v = pParse->pVdbe;
  int i;
  struct yColCache *p;

  for(i=0, p=pParse->aColCache; i<SQLITE_N_COLCACHE; i++, p++){
    if( p->iReg>0 && p->iTable==iTable && p->iColumn==iColumn ){
................................................................................
      p->lru = pParse->iCacheCnt++;
      sqlite3ExprCachePinRegister(pParse, p->iReg);
      return p->iReg;
    }
  }  
  assert( v!=0 );
  sqlite3ExprCodeGetColumnOfTable(v, pTab, iTable, iColumn, iReg);
  if( p5 ){
    sqlite3VdbeChangeP5(v, p5);
  }else{   
    sqlite3ExprCacheStore(pParse, iTable, iColumn, iReg);
  }
  return iReg;
}

/*
** Clear all column cache entries.
*/
SQLITE_PRIVATE void sqlite3ExprCacheClear(Parse *pParse){
................................................................................
    case TK_COLUMN: {
      if( pExpr->iTable<0 ){
        /* This only happens when coding check constraints */
        assert( pParse->ckBase>0 );
        inReg = pExpr->iColumn + pParse->ckBase;
      }else{
        inReg = sqlite3ExprCodeGetColumn(pParse, pExpr->pTab,
                                 pExpr->iColumn, pExpr->iTable, target,
                                 pExpr->op2);
      }
      break;
    }
    case TK_INTEGER: {
      codeInteger(pParse, pExpr, 0, target);
      break;
    }
................................................................................
        sqlite3VdbeResolveLabel(v, endCoalesce);
        break;
      }


      if( pFarg ){
        r1 = sqlite3GetTempRange(pParse, nFarg);

        /* For length() and typeof() functions with a column argument,
        ** set the P5 parameter to the OP_Column opcode to OPFLAG_LENGTHARG
        ** or OPFLAG_TYPEOFARG respectively, to avoid unnecessary data
        ** loading.
        */
        if( (pDef->flags & (SQLITE_FUNC_LENGTH|SQLITE_FUNC_TYPEOF))!=0 ){
          u8 exprOp;
          assert( nFarg==1 );
          assert( pFarg->a[0].pExpr!=0 );
          exprOp = pFarg->a[0].pExpr->op;
          if( exprOp==TK_COLUMN || exprOp==TK_AGG_COLUMN ){
            assert( SQLITE_FUNC_LENGTH==OPFLAG_LENGTHARG );
            assert( SQLITE_FUNC_TYPEOF==OPFLAG_TYPEOFARG );
            testcase( pDef->flags==SQLITE_FUNC_LENGTH );
            pFarg->a[0].pExpr->op2 = pDef->flags;
          }
        }

        sqlite3ExprCachePush(pParse);     /* Ticket 2ea2425d34be */
        sqlite3ExprCodeExprList(pParse, pFarg, r1, 1);
        sqlite3ExprCachePop(pParse, 1);   /* Ticket 2ea2425d34be */
      }else{
        r1 = 0;
      }
#ifndef SQLITE_OMIT_VIRTUALTABLE
................................................................................
  if( sqlite3ExprCompare(pA->pRight, pB->pRight) ) return 2;
  if( sqlite3ExprListCompare(pA->x.pList, pB->x.pList) ) return 2;
  if( pA->iTable!=pB->iTable || pA->iColumn!=pB->iColumn ) return 2;
  if( ExprHasProperty(pA, EP_IntValue) ){
    if( !ExprHasProperty(pB, EP_IntValue) || pA->u.iValue!=pB->u.iValue ){
      return 2;
    }
  }else if( pA->op!=TK_COLUMN && pA->op!=TK_AGG_COLUMN && pA->u.zToken ){
    if( ExprHasProperty(pB, EP_IntValue) || NEVER(pB->u.zToken==0) ) return 2;
    if( strcmp(pA->u.zToken,pB->u.zToken)!=0 ){
      return 2;
    }
  }
  if( (pA->flags & EP_ExpCollate)!=(pB->flags & EP_ExpCollate) ) return 1;
  if( (pA->flags & EP_ExpCollate)!=0 && pA->pColl!=pB->pColl ) return 2;
................................................................................
    Expr *pExprA = pA->a[i].pExpr;
    Expr *pExprB = pB->a[i].pExpr;
    if( pA->a[i].sortOrder!=pB->a[i].sortOrder ) return 1;
    if( sqlite3ExprCompare(pExprA, pExprB) ) return 1;
  }
  return 0;
}

/*
** This is the expression callback for sqlite3FunctionUsesOtherSrc().
**
** Determine if an expression references any table other than one of the
** tables in pWalker->u.pSrcList and abort if it does.
*/
static int exprUsesOtherSrc(Walker *pWalker, Expr *pExpr){
  if( pExpr->op==TK_COLUMN || pExpr->op==TK_AGG_COLUMN ){
    int i;
    SrcList *pSrc = pWalker->u.pSrcList;
    for(i=0; i<pSrc->nSrc; i++){
      if( pExpr->iTable==pSrc->a[i].iCursor ) return WRC_Continue;
    }
    return WRC_Abort;
  }else{
    return WRC_Continue;
  }
}

/*
** Determine if any of the arguments to the pExpr Function references
** any SrcList other than pSrcList.  Return true if they do.  Return
** false if pExpr has no argument or has only constant arguments or
** only references tables named in pSrcList.
*/
static int sqlite3FunctionUsesOtherSrc(Expr *pExpr, SrcList *pSrcList){
  Walker w;
  assert( pExpr->op==TK_AGG_FUNCTION );
  memset(&w, 0, sizeof(w));
  w.xExprCallback = exprUsesOtherSrc;
  w.u.pSrcList = pSrcList;
  if( sqlite3WalkExprList(&w, pExpr->x.pList)!=WRC_Continue ) return 1;
  return 0;
}

/*
** Add a new element to the pAggInfo->aCol[] array.  Return the index of
** the new element.  Return a negative number if malloc fails.
*/
static int addAggInfoColumn(sqlite3 *db, AggInfo *pInfo){
  int i;
................................................................................
            break;
          } /* endif pExpr->iTable==pItem->iCursor */
        } /* end loop over pSrcList */
      }
      return WRC_Prune;
    }
    case TK_AGG_FUNCTION: {
      if( !sqlite3FunctionUsesOtherSrc(pExpr, pSrcList) ){


        /* Check to see if pExpr is a duplicate of another aggregate 
        ** function that is already in the pAggInfo structure
        */
        struct AggInfo_func *pItem = pAggInfo->aFunc;
        for(i=0; i<pAggInfo->nFunc; i++, pItem++){
          if( sqlite3ExprCompare(pItem->pExpr, pExpr)==0 ){
            break;
................................................................................
        return WRC_Prune;
      }
    }
  }
  return WRC_Continue;
}
static int analyzeAggregatesInSelect(Walker *pWalker, Select *pSelect){
  UNUSED_PARAMETER(pWalker);
  UNUSED_PARAMETER(pSelect);





  return WRC_Continue;

}

/*
** Analyze the given expression looking for aggregate functions and
** for variables that need to be added to the pParse->aAgg[] array.
** Make additional entries to the pParse->aAgg[] array as necessary.
**
** This routine should only be called after the expression has been
** analyzed by sqlite3ResolveExprNames().
*/
SQLITE_PRIVATE void sqlite3ExprAnalyzeAggregates(NameContext *pNC, Expr *pExpr){
  Walker w;
  memset(&w, 0, sizeof(w));
  w.xExprCallback = analyzeAggregate;
  w.xSelectCallback = analyzeAggregatesInSelect;
  w.u.pNC = pNC;
  assert( pNC->pSrcList!=0 );
  sqlite3WalkExpr(&w, pExpr);
}

................................................................................
  /* Delete the Table structure itself.
  */
  sqliteDeleteColumnNames(db, pTable);
  sqlite3DbFree(db, pTable->zName);
  sqlite3DbFree(db, pTable->zColAff);
  sqlite3SelectDelete(db, pTable->pSelect);
#ifndef SQLITE_OMIT_CHECK
  sqlite3ExprListDelete(db, pTable->pCheck);
#endif
#ifndef SQLITE_OMIT_VIRTUALTABLE
  sqlite3VtabClear(db, pTable);
#endif
  sqlite3DbFree(db, pTable);
}

................................................................................
/*
** Add a new CHECK constraint to the table currently under construction.
*/
SQLITE_PRIVATE void sqlite3AddCheckConstraint(
  Parse *pParse,    /* Parsing context */
  Expr *pCheckExpr  /* The check expression */
){

#ifndef SQLITE_OMIT_CHECK
  Table *pTab = pParse->pNewTable;
  if( pTab && !IN_DECLARE_VTAB ){
    pTab->pCheck = sqlite3ExprListAppend(pParse, pTab->pCheck, pCheckExpr);
    if( pParse->constraintName.n ){
      sqlite3ExprListSetName(pParse, pTab->pCheck, &pParse->constraintName, 1);
    }
  }else
#endif
  {
    sqlite3ExprDelete(pParse->db, pCheckExpr);
  }
}

/*
** Set the collation function of the most recently parsed table column
** to the CollSeq given.
*/
................................................................................

#ifndef SQLITE_OMIT_CHECK
  /* Resolve names in all CHECK constraint expressions.
  */
  if( p->pCheck ){
    SrcList sSrc;                   /* Fake SrcList for pParse->pNewTable */
    NameContext sNC;                /* Name context for pParse->pNewTable */
    ExprList *pList;                /* List of all CHECK constraints */
    int i;                          /* Loop counter */

    memset(&sNC, 0, sizeof(sNC));
    memset(&sSrc, 0, sizeof(sSrc));
    sSrc.nSrc = 1;
    sSrc.a[0].zName = p->zName;
    sSrc.a[0].pTab = p;
    sSrc.a[0].iCursor = -1;
    sNC.pParse = pParse;
    sNC.pSrcList = &sSrc;
    sNC.isCheck = 1;
    pList = p->pCheck;
    for(i=0; i<pList->nExpr; i++){
      if( sqlite3ResolveExprNames(&sNC, pList->a[i].pExpr) ){
        return;
      }
    }
  }
#endif /* !defined(SQLITE_OMIT_CHECK) */

  /* If the db->init.busy is 1 it means we are reading the SQL off the
  ** "sqlite_master" or "sqlite_temp_master" table on the disk.
  ** So do not write to the disk again.  Extract the root page number
................................................................................
  }

exit_drop_index:
  sqlite3SrcListDelete(db, pName);
}

/*
** pArray is a pointer to an array of objects. Each object in the
** array is szEntry bytes in size. This routine uses sqlite3DbRealloc()
** to extend the array so that there is space for a new object at the end.
**
** When this function is called, *pnEntry contains the current size of
** the array (in entries - so the allocation is ((*pnEntry) * szEntry) bytes
** in total).
**
** If the realloc() is successful (i.e. if no OOM condition occurs), the
** space allocated for the new object is zeroed, *pnEntry updated to
** reflect the new size of the array and a pointer to the new allocation
** returned. *pIdx is set to the index of the new array entry in this case.
**



** Otherwise, if the realloc() fails, *pIdx is set to -1, *pnEntry remains
** unchanged and a copy of pArray returned.
*/
SQLITE_PRIVATE void *sqlite3ArrayAllocate(
  sqlite3 *db,      /* Connection to notify of malloc failures */
  void *pArray,     /* Array of objects.  Might be reallocated */
  int szEntry,      /* Size of each object in the array */
  int *pnEntry,     /* Number of objects currently in use */
  int *pIdx         /* Write the index of a new slot here */
................................................................................
}

/* During the search for the best function definition, this procedure
** is called to test how well the function passed as the first argument
** matches the request for a function with nArg arguments in a system
** that uses encoding enc. The value returned indicates how well the
** request is matched. A higher value indicates a better match.
**
** If nArg is -1 that means to only return a match (non-zero) if p->nArg
** is also -1.  In other words, we are searching for a function that
** takes a variable number of arguments.
**
** If nArg is -2 that means that we are searching for any function 
** regardless of the number of arguments it uses, so return a positive
** match score for any
**
** The returned value is always between 0 and 6, as follows:
**
** 0: Not a match.
** 1: UTF8/16 conversion required and function takes any number of arguments.
** 2: UTF16 byte order change required and function takes any number of args.
** 3: encoding matches and function takes any number of arguments
** 4: UTF8/16 conversion required - argument count matches exactly
** 5: UTF16 byte order conversion required - argument count matches exactly
** 6: Perfect match:  encoding and argument count match exactly.
**
** If nArg==(-2) then any function with a non-null xStep or xFunc is
** a perfect match and any function with both xStep and xFunc NULL is
** a non-match.
*/
#define FUNC_PERFECT_MATCH 6  /* The score for a perfect match */
static int matchQuality(
  FuncDef *p,     /* The function we are evaluating for match quality */
  int nArg,       /* Desired number of arguments.  (-1)==any */
  u8 enc          /* Desired text encoding */
){
  int match;

  /* nArg of -2 is a special case */
  if( nArg==(-2) ) return (p->xFunc==0 && p->xStep==0) ? 0 : FUNC_PERFECT_MATCH;

  /* Wrong number of arguments means "no match" */
  if( p->nArg!=nArg && p->nArg>=0 ) return 0;

  /* Give a better score to a function with a specific number of arguments
  ** than to function that accepts any number of arguments. */
  if( p->nArg==nArg ){
    match = 4;
  }else{
    match = 1;
  }

  /* Bonus points if the text encoding matches */
  if( enc==p->iPrefEnc ){
    match += 2;  /* Exact encoding match */
  }else if( (enc & p->iPrefEnc & 2)!=0 ){
    match += 1;  /* Both are UTF16, but with different byte orders */
  }

  return match;
}

/*
** Search a FuncDefHash for a function with the given name.  Return
** a pointer to the matching FuncDef if found, or 0 if there is no match.
*/
................................................................................
** Locate a user function given a name, a number of arguments and a flag
** indicating whether the function prefers UTF-16 over UTF-8.  Return a
** pointer to the FuncDef structure that defines that function, or return
** NULL if the function does not exist.
**
** If the createFlag argument is true, then a new (blank) FuncDef
** structure is created and liked into the "db" structure if a
** no matching function previously existed.
**
** If nArg is -2, then the first valid function found is returned.  A
** function is valid if either xFunc or xStep is non-zero.  The nArg==(-2)
** case is used to see if zName is a valid function name for some number
** of arguments.  If nArg is -2, then createFlag must be 0.

**
** If createFlag is false, then a function with the required name and
** number of arguments may be returned even if the eTextRep flag does not
** match that requested.
*/
SQLITE_PRIVATE FuncDef *sqlite3FindFunction(
  sqlite3 *db,       /* An open database */
  const char *zName, /* Name of the function.  Not null-terminated */
  int nName,         /* Number of characters in the name */
  int nArg,          /* Number of arguments.  -1 means any number */
  u8 enc,            /* Preferred text encoding */
  u8 createFlag      /* Create new entry if true and does not otherwise exist */
){
  FuncDef *p;         /* Iterator variable */
  FuncDef *pBest = 0; /* Best match found so far */
  int bestScore = 0;  /* Score of best match */
  int h;              /* Hash value */

  assert( nArg>=(-2) );
  assert( nArg>=(-1) || createFlag==0 );
  assert( enc==SQLITE_UTF8 || enc==SQLITE_UTF16LE || enc==SQLITE_UTF16BE );
  h = (sqlite3UpperToLower[(u8)zName[0]] + nName) % ArraySize(db->aFunc.a);

  /* First search for a match amongst the application-defined functions.
  */
  p = functionSearch(&db->aFunc, h, zName, nName);
  while( p ){
................................................................................
    }
  }

  /* If the createFlag parameter is true and the search did not reveal an
  ** exact match for the name, number of arguments and encoding, then add a
  ** new entry to the hash table and return it.
  */
  if( createFlag && bestScore<FUNC_PERFECT_MATCH && 
      (pBest = sqlite3DbMallocZero(db, sizeof(*pBest)+nName+1))!=0 ){
    pBest->zName = (char *)&pBest[1];
    pBest->nArg = (u16)nArg;
    pBest->iPrefEnc = enc;
    memcpy(pBest->zName, zName, nName);
    pBest->zName[nName] = 0;
    sqlite3FuncDefInsert(&db->aFunc, pBest);
................................................................................
    /* Collect rowids of every row to be deleted.
    */
    sqlite3VdbeAddOp2(v, OP_Null, 0, iRowSet);
    pWInfo = sqlite3WhereBegin(
        pParse, pTabList, pWhere, 0, 0, WHERE_DUPLICATES_OK
    );
    if( pWInfo==0 ) goto delete_from_cleanup;
    regRowid = sqlite3ExprCodeGetColumn(pParse, pTab, -1, iCur, iRowid, 0);
    sqlite3VdbeAddOp2(v, OP_RowSetAdd, iRowSet, regRowid);
    if( db->flags & SQLITE_CountRows ){
      sqlite3VdbeAddOp2(v, OP_AddImm, memCnt, 1);
    }
    sqlite3WhereEnd(pWInfo);

    /* Delete every item whose key was written to the list during the
................................................................................
    FUNCTION(trim,               2, 3, 0, trimFunc         ),
    FUNCTION(min,               -1, 0, 1, minmaxFunc       ),
    FUNCTION(min,                0, 0, 1, 0                ),
    AGGREGATE(min,               1, 0, 1, minmaxStep,      minMaxFinalize ),
    FUNCTION(max,               -1, 1, 1, minmaxFunc       ),
    FUNCTION(max,                0, 1, 1, 0                ),
    AGGREGATE(max,               1, 1, 1, minmaxStep,      minMaxFinalize ),
    FUNCTION2(typeof,            1, 0, 0, typeofFunc,  SQLITE_FUNC_TYPEOF),
    FUNCTION2(length,            1, 0, 0, lengthFunc,  SQLITE_FUNC_LENGTH),
    FUNCTION(substr,             2, 0, 0, substrFunc       ),
    FUNCTION(substr,             3, 0, 0, substrFunc       ),
    FUNCTION(abs,                1, 0, 0, absFunc          ),
#ifndef SQLITE_OMIT_FLOATING_POINT
    FUNCTION(round,              1, 0, 0, roundFunc        ),
    FUNCTION(round,              2, 0, 0, roundFunc        ),
#endif
    FUNCTION(upper,              1, 0, 0, upperFunc        ),
    FUNCTION(lower,              1, 0, 0, lowerFunc        ),
    FUNCTION(coalesce,           1, 0, 0, 0                ),
    FUNCTION(coalesce,           0, 0, 0, 0                ),
    FUNCTION2(coalesce,         -1, 0, 0, ifnullFunc,  SQLITE_FUNC_COALESCE),

    FUNCTION(hex,                1, 0, 0, hexFunc          ),
    FUNCTION2(ifnull,            2, 0, 0, ifnullFunc,  SQLITE_FUNC_COALESCE),

    FUNCTION(random,             0, 0, 0, randomFunc       ),
    FUNCTION(randomblob,         1, 0, 0, randomBlob       ),
    FUNCTION(nullif,             2, 0, 1, nullifFunc       ),
    FUNCTION(sqlite_version,     0, 0, 0, versionFunc      ),
    FUNCTION(sqlite_source_id,   0, 0, 0, sourceidFunc     ),
    FUNCTION(sqlite_log,         2, 0, 0, errlogFunc       ),
#ifndef SQLITE_OMIT_COMPILEOPTION_DIAGS
................................................................................
  int nCol;           /* Number of columns */
  int onError;        /* Conflict resolution strategy */
  int j1;             /* Addresss of jump instruction */
  int j2 = 0, j3;     /* Addresses of jump instructions */
  int regData;        /* Register containing first data column */
  int iCur;           /* Table cursor number */
  Index *pIdx;         /* Pointer to one of the indices */
  sqlite3 *db;         /* Database connection */
  int seenReplace = 0; /* True if REPLACE is used to resolve INT PK conflict */
  int regOldRowid = (rowidChng && isUpdate) ? rowidChng : regRowid;

  db = pParse->db;
  v = sqlite3GetVdbe(pParse);
  assert( v!=0 );
  assert( pTab->pSelect==0 );  /* This table is not a VIEW */
  nCol = pTab->nCol;
  regData = regRowid + 1;

  /* Test all NOT NULL constraints.
................................................................................
      case OE_Abort:
        sqlite3MayAbort(pParse);
      case OE_Rollback:
      case OE_Fail: {
        char *zMsg;
        sqlite3VdbeAddOp3(v, OP_HaltIfNull,
                                  SQLITE_CONSTRAINT, onError, regData+i);
        zMsg = sqlite3MPrintf(db, "%s.%s may not be NULL",
                              pTab->zName, pTab->aCol[i].zName);
        sqlite3VdbeChangeP4(v, -1, zMsg, P4_DYNAMIC);
        break;
      }
      case OE_Ignore: {
        sqlite3VdbeAddOp2(v, OP_IsNull, regData+i, ignoreDest);
        break;
................................................................................
      }
    }
  }

  /* Test all CHECK constraints
  */
#ifndef SQLITE_OMIT_CHECK
  if( pTab->pCheck && (db->flags & SQLITE_IgnoreChecks)==0 ){
    ExprList *pCheck = pTab->pCheck;
    pParse->ckBase = regData;

    onError = overrideError!=OE_Default ? overrideError : OE_Abort;
    for(i=0; i<pCheck->nExpr; i++){
      int allOk = sqlite3VdbeMakeLabel(v);
      sqlite3ExprIfTrue(pParse, pCheck->a[i].pExpr, allOk, SQLITE_JUMPIFNULL);
      if( onError==OE_Ignore ){
        sqlite3VdbeAddOp2(v, OP_Goto, 0, ignoreDest);
      }else{
        char *zConsName = pCheck->a[i].zName;
        if( onError==OE_Replace ) onError = OE_Abort; /* IMP: R-15569-63625 */
        if( zConsName ){
          zConsName = sqlite3MPrintf(db, "constraint %s failed", zConsName);
        }else{
          zConsName = 0;
        }
        sqlite3HaltConstraint(pParse, onError, zConsName, P4_DYNAMIC);
      }
      sqlite3VdbeResolveLabel(v, allOk);
    }
  }
#endif /* !defined(SQLITE_OMIT_CHECK) */

  /* If we have an INTEGER PRIMARY KEY, make sure the primary key
  ** of the new record does not previously exist.  Except, if this
  ** is an UPDATE and the primary key is not changing, that is OK.
  */
................................................................................
        **
        **   REPLACE INTO t(rowid) VALUES($newrowid)
        **
        ** to run without a statement journal if there are no indexes on the
        ** table.
        */
        Trigger *pTrigger = 0;
        if( db->flags&SQLITE_RecTriggers ){
          pTrigger = sqlite3TriggersExist(pParse, pTab, TK_DELETE, 0, 0);
        }
        if( pTrigger || sqlite3FkRequired(pParse, pTab, 0, 0) ){
          sqlite3MultiWrite(pParse);
          sqlite3GenerateRowDelete(
              pParse, pTab, baseCur, regRowid, 0, pTrigger, OE_Replace
          );
................................................................................
      case OE_Fail: {
        int j;
        StrAccum errMsg;
        const char *zSep;
        char *zErr;

        sqlite3StrAccumInit(&errMsg, 0, 0, 200);
        errMsg.db = db;
        zSep = pIdx->nColumn>1 ? "columns " : "column ";
        for(j=0; j<pIdx->nColumn; j++){
          char *zCol = pTab->aCol[pIdx->aiColumn[j]].zName;
          sqlite3StrAccumAppend(&errMsg, zSep, -1);
          zSep = ", ";
          sqlite3StrAccumAppend(&errMsg, zCol, -1);
        }
................................................................................
        sqlite3VdbeAddOp2(v, OP_Goto, 0, ignoreDest);
        break;
      }
      default: {
        Trigger *pTrigger = 0;
        assert( onError==OE_Replace );
        sqlite3MultiWrite(pParse);
        if( db->flags&SQLITE_RecTriggers ){
          pTrigger = sqlite3TriggersExist(pParse, pTab, TK_DELETE, 0, 0);
        }
        sqlite3GenerateRowDelete(
            pParse, pTab, baseCur, regR, 0, pTrigger, OE_Replace
        );
        seenReplace = 1;
        break;
................................................................................
      if( xferCompatibleIndex(pDestIdx, pSrcIdx) ) break;
    }
    if( pSrcIdx==0 ){
      return 0;    /* pDestIdx has no corresponding index in pSrc */
    }
  }
#ifndef SQLITE_OMIT_CHECK
  if( pDest->pCheck && sqlite3ExprListCompare(pSrc->pCheck, pDest->pCheck) ){
    return 0;   /* Tables have different CHECK constraints.  Ticket #2252 */
  }
#endif
#ifndef SQLITE_OMIT_FOREIGN_KEY
  /* Disallow the transfer optimization if the destination table constains
  ** any foreign key constraints.  This is more restrictive than necessary.
  ** But the main beneficiary of the transfer optimization is the VACUUM 
................................................................................
  int cnt;                    /* Index added to make the name unique */
  Column *aCol, *pCol;        /* For looping over result columns */
  int nCol;                   /* Number of columns in the result set */
  Expr *p;                    /* Expression for a single result column */
  char *zName;                /* Column name */
  int nName;                  /* Size of name in zName[] */

  if( pEList ){
    nCol = pEList->nExpr;
    aCol = sqlite3DbMallocZero(db, sizeof(aCol[0])*nCol);
    testcase( aCol==0 );
  }else{
    nCol = 0;
    aCol = 0;
  }
  *pnCol = nCol;
  *paCol = aCol;

  for(i=0, pCol=aCol; i<nCol; i++, pCol++){
    /* Get an appropriate name for the column
    */
    p = pEList->a[i].pExpr;
    assert( p->pRight==0 || ExprHasProperty(p->pRight, EP_IntValue)
               || p->pRight->u.zToken==0 || p->pRight->u.zToken[0]!=0 );
    if( (zName = pEList->a[i].zName)!=0 ){
................................................................................
    }
  }

  /***** If we reach this point, flattening is permitted. *****/

  /* Authorize the subquery */
  pParse->zAuthContext = pSubitem->zName;
  TESTONLY(i =) sqlite3AuthCheck(pParse, SQLITE_SELECT, 0, 0, 0);
  testcase( i==SQLITE_DENY );
  pParse->zAuthContext = zSavedAuthContext;

  /* If the sub-query is a compound SELECT statement, then (by restrictions
  ** 17 and 18 above) it must be a UNION ALL and the parent query must 
  ** be of the form:
  **
  **     SELECT <expr-list> FROM (<sub-query>) <where-clause> 
................................................................................
        for(i=0; i<sAggInfo.nColumn; i++){
          struct AggInfo_col *pCol = &sAggInfo.aCol[i];
          if( pCol->iSorterColumn>=j ){
            int r1 = j + regBase;
            int r2;

            r2 = sqlite3ExprCodeGetColumn(pParse, 
                               pCol->pTab, pCol->iColumn, pCol->iTable, r1, 0);
            if( r1!=r2 ){
              sqlite3VdbeAddOp2(v, OP_SCopy, r2, r1);
            }
            j++;
          }
        }
        regRecord = sqlite3GetTempReg(pParse);
................................................................................
static int vtabCallConstructor(
  sqlite3 *db, 
  Table *pTab,
  Module *pMod,
  int (*xConstruct)(sqlite3*,void*,int,const char*const*,sqlite3_vtab**,char**),
  char **pzErr
){
  VtabCtx sCtx, *pPriorCtx;
  VTable *pVTable;
  int rc;
  const char *const*azArg = (const char *const*)pTab->azModuleArg;
  int nArg = pTab->nModuleArg;
  char *zErr = 0;
  char *zModuleName = sqlite3MPrintf(db, "%s", pTab->zName);

................................................................................
  pVTable->pMod = pMod;

  /* Invoke the virtual table constructor */
  assert( &db->pVtabCtx );
  assert( xConstruct );
  sCtx.pTab = pTab;
  sCtx.pVTable = pVTable;
  pPriorCtx = db->pVtabCtx;
  db->pVtabCtx = &sCtx;
  rc = xConstruct(db, pMod->pAux, nArg, azArg, &pVTable->pVtab, &zErr);
  db->pVtabCtx = pPriorCtx;
  if( rc==SQLITE_NOMEM ) db->mallocFailed = 1;

  if( SQLITE_OK!=rc ){
    if( zErr==0 ){
      *pzErr = sqlite3MPrintf(db, "vtable constructor failed: %s", zModuleName);
    }else {
      *pzErr = sqlite3MPrintf(db, "%s", zErr);
................................................................................
    return 0;
  }
#ifdef SQLITE_EBCDIC
  if( *pnoCase ) return 0;
#endif
  pList = pExpr->x.pList;
  pLeft = pList->a[1].pExpr;
  if( pLeft->op!=TK_COLUMN 
   || sqlite3ExprAffinity(pLeft)!=SQLITE_AFF_TEXT 
   || IsVirtual(pLeft->pTab)
  ){
    /* IMP: R-02065-49465 The left-hand side of the LIKE or GLOB operator must
    ** be the name of an indexed column with TEXT affinity. */
    return 0;
  }
  assert( pLeft->iColumn!=(-1) ); /* Because IPK never has AFF_TEXT */

  pRight = pList->a[0].pExpr;
................................................................................
  **
  **   1. The index is itself UNIQUE, and
  **
  **   2. All of the columns in the index are either part of the pDistinct
  **      list, or else the WHERE clause contains a term of the form "col=X",
  **      where X is a constant value. The collation sequences of the
  **      comparison and select-list expressions must match those of the index.
  **
  **   3. All of those index columns for which the WHERE clause does not
  **      contain a "col=X" term are subject to a NOT NULL constraint.
  */
  for(pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext){
    if( pIdx->onError==OE_None ) continue;
    for(i=0; i<pIdx->nColumn; i++){
      int iCol = pIdx->aiColumn[i];
      if( 0==findTerm(pWC, iBase, iCol, ~(Bitmask)0, WO_EQ, pIdx) ){
        int iIdxCol = findIndexCol(pParse, pDistinct, iBase, pIdx, i);
        if( iIdxCol<0 || pTab->aCol[pIdx->aiColumn[i]].notNull==0 ){
          break;
        }
      }
    }
    if( i==pIdx->nColumn ){
      /* This index implies that the DISTINCT qualifier is redundant. */
      return 1;
    }
  }
................................................................................
  if( j>=nTerm ){
    /* All terms of the ORDER BY clause are covered by this index so
    ** this index can be used for sorting. */
    return 1;
  }
  if( pIdx->onError!=OE_None && i==pIdx->nColumn
      && (wsFlags & WHERE_COLUMN_NULL)==0
      && !referencesOtherTables(pOrderBy, pMaskSet, j, base) 
  ){
    Column *aCol = pIdx->pTable->aCol;

    /* All terms of this index match some prefix of the ORDER BY clause,
    ** the index is UNIQUE, and no terms on the tail of the ORDER BY



    ** refer to other tables in a join. So, assuming that the index entries
    ** visited contain no NULL values, then this index delivers rows in
    ** the required order.
    **
    ** It is not possible for any of the first nEqCol index fields to be
    ** NULL (since the corresponding "=" operator in the WHERE clause would 
    ** not be true). So if all remaining index columns have NOT NULL 
    ** constaints attached to them, we can be confident that the visited
    ** index entries are free of NULLs.  */
    for(i=nEqCol; i<pIdx->nColumn; i++){
      if( aCol[pIdx->aiColumn[i]].notNull==0 ) break;
    }
    return (i==pIdx->nColumn);
  }
  return 0;
}

/*
** Prepare a crude estimate of the logarithm of the input value.
** The results need not be exact.  This is only used for estimating
................................................................................
          explainOneScan(
              pParse, pOrTab, &pSubWInfo->a[0], iLevel, pLevel->iFrom, 0
          );
          if( (wctrlFlags & WHERE_DUPLICATES_OK)==0 ){
            int iSet = ((ii==pOrWc->nTerm-1)?-1:ii);
            int r;
            r = sqlite3ExprCodeGetColumn(pParse, pTabItem->pTab, -1, iCur, 
                                         regRowid, 0);
            sqlite3VdbeAddOp4Int(v, OP_RowSetTest, regRowset,
                                 sqlite3VdbeCurrentAddr(v)+2, r, iSet);
          }
          sqlite3VdbeAddOp2(v, OP_Gosub, regReturn, iLoopBody);

          /* The pSubWInfo->untestedTerms flag means that this OR term
          ** contained one or more AND term from a notReady table.  The
................................................................................

/*
** An instance of this structure is used to store the LIKE,
** GLOB, NOT LIKE, and NOT GLOB operators.
*/
struct LikeOp {
  Token eOperator;  /* "like" or "glob" or "regexp" */
  int bNot;         /* True if the NOT keyword is present */
};

/*
** An instance of the following structure describes the event of a
** TRIGGER.  "a" is the event type, one of TK_UPDATE, TK_INSERT,
** TK_DELETE, or TK_INSTEAD.  If the event is of the form
**
................................................................................
#ifndef YYSTACKDEPTH
#define YYSTACKDEPTH 100
#endif
#define sqlite3ParserARG_SDECL Parse *pParse;
#define sqlite3ParserARG_PDECL ,Parse *pParse
#define sqlite3ParserARG_FETCH Parse *pParse = yypParser->pParse
#define sqlite3ParserARG_STORE yypParser->pParse = pParse
#define YYNSTATE 630
#define YYNRULE 327
#define YYFALLBACK 1
#define YY_NO_ACTION      (YYNSTATE+YYNRULE+2)
#define YY_ACCEPT_ACTION  (YYNSTATE+YYNRULE+1)
#define YY_ERROR_ACTION   (YYNSTATE+YYNRULE)

/* The yyzerominor constant is used to initialize instances of
................................................................................
**                     yy_action.  Used to detect hash collisions.
**  yy_shift_ofst[]    For each state, the offset into yy_action for
**                     shifting terminals.
**  yy_reduce_ofst[]   For each state, the offset into yy_action for
**                     shifting non-terminals after a reduce.
**  yy_default[]       Default action for each state.
*/
#define YY_ACTTAB_COUNT (1562)
static const YYACTIONTYPE yy_action[] = {
 /*     0 */   312,  330,  575,  574,   15,  171,  186,  597,   56,   56,
 /*    10 */    56,   56,   49,   54,   54,   54,   54,   53,   53,   52,
 /*    20 */    52,   52,   51,  235,   52,   52,   52,   51,  235,  627,
 /*    30 */   590,  584,   56,   56,   56,   56,  316,   54,   54,   54,
 /*    40 */    54,   53,   53,   52,   52,   52,   51,  235,  301,   57,
 /*    50 */    58,   48,  582,  581,  583,  583,   55,   55,   56,   56,
 /*    60 */    56,   56,  571,   54,   54,   54,   54,   53,   53,   52,
 /*    70 */    52,   52,   51,  235,  312,  597,  328,  198,  197,  196,
 /*    80 */    33,   54,   54,   54,   54,   53,   53,   52,   52,   52,
 /*    90 */    51,  235,   53,   53,   52,   52,   52,   51,  235,  492,
 /*   100 */   597,  441,   66,  237,  590,  584,  597,  299,  365,   59,
 /*   110 */   482,   67,  362,    1,  621,  353,  621,  623,  622,  516,
 /*   120 */   515,  442,  443,   57,   58,   48,  582,  581,  583,  583,
 /*   130 */    55,   55,   56,   56,   56,   56,  608,   54,   54,   54,
 /*   140 */    54,   53,   53,   52,   52,   52,   51,  235,  312,  225,
 /*   150 */   618,  617,  616,  176,  138,  283,  386,  278,  385,  168,
 /*   160 */   492,  554,  623,  622,  623,  622,  274,  441,  597,  412,
 /*   170 */   553,  607,   67,  215,  597,  621,  506,  507,  590,  584,
 /*   180 */   444,  571,  621,  391,  415,  620,  619,  442,  338,  623,
 /*   190 */   622,  392,  601,   92,  224,  193,  671,   57,   58,   48,
 /*   200 */   582,  581,  583,  583,   55,   55,   56,   56,   56,   56,
 /*   210 */   672,   54,   54,   54,   54,   53,   53,   52,   52,   52,
 /*   220 */    51,  235,  312,  262,  234,  233,  505,  132,  486,  510,
 /*   230 */   620,  619,  620,  619,  399,  438,  487,  566,  621,  389,
 /*   240 */   412,  384,  440,  532,  439,  602,  339,  571,  504,  603,
 /*   250 */   203,  533,  590,  584,   45,  415,  548,  620,  619,  383,
 /*   260 */   380,  379,    6,  601,   92,  526,  261,  572,  572,  595,
 /*   270 */   378,   57,   58,   48,  582,  581,  583,  583,   55,   55,
 /*   280 */    56,   56,   56,   56,  600,   54,   54,   54,   54,   53,
 /*   290 */    53,   52,   52,   52,   51,  235,  312,  466,  326,  561,
 /*   300 */   593,  593,  593,  282,  311,  399,  412,  568,  493,  214,
 /*   310 */   400,  623,  622,   68,  281,  560,    7,  623,  622,  167,
 /*   320 */   577,  415,   65,  408,  575,  574,  590,  584,  673,  601,
 /*   330 */    92,  559,  410,  520,  579,  579,  306,  425,  623,  622,
 /*   340 */   208,  572,  572,  467,  519,   57,   58,   48,  582,  581,
 /*   350 */   583,  583,   55,   55,   56,   56,   56,   56,  576,   54,
 /*   360 */    54,   54,   54,   53,   53,   52,   52,   52,   51,  235,
 /*   370 */   312,  399,  412,  317,  600,  412,  350,  549,  578,  620,
 /*   380 */   619,  423,  204,  175,  571,  620,  619,  415,  551,  355,
 /*   390 */   415,  257,  349,  256,  174,  601,   74,  354,  601,   91,
 /*   400 */   590,  584,  237,  467,  621,  547,  620,  619,  164,  623,
 /*   410 */   622,  544,   62,   39,  251,  580,  600,  348,  555,   57,
 /*   420 */    58,   48,  582,  581,  583,  583,   55,   55,   56,   56,
 /*   430 */    56,   56,  565,   54,   54,   54,   54,   53,   53,   52,
 /*   440 */    52,   52,   51,  235,  312,  554,  182,  145,  531,  292,
 /*   450 */   231,  257,  349,  256,  553,  221,  412,  181,  248,  549,
 /*   460 */   250,  412,  237,   50,   47,  146,  412,  410,  412,  579,
 /*   470 */   579,  415,  549,  567,  590,  584,  415,  620,  619,  601,
 /*   480 */    16,  415,  189,  415,  601,   92,  268,   36,  544,  601,
 /*   490 */    92,  601,   73,   57,   58,   48,  582,  581,  583,  583,
 /*   500 */    55,   55,   56,   56,   56,   56,  187,   54,   54,   54,
 /*   510 */    54,   53,   53,   52,   52,   52,   51,  235,  312,  564,
 /*   520 */   397,  410,  528,  579,  579,  561,  395,  535,  201,  145,
 /*   530 */   264,  320,  266,  388,  375,  410,  249,  579,  579,  236,
 /*   540 */    40,  560,   38,   50,   47,  146,   19,  606,  590,  584,
 /*   550 */   422,  948,  563,  948,  549,  496,  472,  559,  602,  403,
 /*   560 */   422,  947,  603,  947,  562,  167,  200,   57,   58,   48,
 /*   570 */   582,  581,  583,  583,   55,   55,   56,   56,   56,   56,
 /*   580 */   156,   54,   54,   54,   54,   53,   53,   52,   52,   52,
 /*   590 */    51,  235,  312,  262,  412,  426,  511,  208,  347,  492,
 /*   600 */   600,   50,   47,  146,  410,  426,  579,  579,  621,  415,
 /*   610 */   430,   67,  199,  143,  621,  166,  474,  601,   69,  317,
 /*   620 */   475,  435,  590,  584,  274,  234,  233,  958,  184,  420,
 /*   630 */     2,  600,  358,  552,  366,  470,  336,  476,  476,  368,
 /*   640 */   359,   57,   58,   48,  582,  581,  583,  583,   55,   55,
 /*   650 */    56,   56,   56,   56,  354,   54,   54,   54,   54,   53,
 /*   660 */    53,   52,   52,   52,   51,  235,  312,  412,  572,  572,
 /*   670 */   271,  412,  558,  874,  361,  213,  143,  412,   50,   47,
 /*   680 */   146,   30,  415,  540,  355,  334,  415,  412,  629,    2,
 /*   690 */   601,   94,  415,  513,  601,   97,  590,  584,  621,  621,
 /*   700 */   601,   95,  415,  306,  424,  630,  628,  332,  173,  269,
 /*   710 */   601,  104,  171,  546,  597,   57,   58,   48,  582,  581,
 /*   720 */   583,  583,   55,   55,   56,   56,   56,   56,  412,   54,
 /*   730 */    54,   54,   54,   53,   53,   52,   52,   52,   51,  235,
 /*   740 */   312,  412,  275,  415,  412,   22,  329,  340,  423,  544,
 /*   750 */   217,  601,  103,  568,  407,  214,  415,  621,   35,  415,
 /*   760 */   412,  540,  412,   12,  601,  105,  237,  601,  106,   11,
 /*   770 */   590,  584,   50,   47,  146,  415,  621,  415,  353,  325,
 /*   780 */   164,  129,  597,  601,  133,  601,  134,  207,  287,   57,
 /*   790 */    58,   48,  582,  581,  583,  583,   55,   55,   56,   56,
 /*   800 */    56,   56,  412,   54,   54,   54,   54,   53,   53,   52,
 /*   810 */    52,   52,   51,  235,  312,  412,  275,  415,  412,  275,
 /*   820 */   275,  600,  275,  544,  367,  601,   98,  542,  412,  170,
 /*   830 */   415,  621,  524,  415,  621,  621,  169,  621,  601,  102,
 /*   840 */   604,  601,  101,  415,  590,  584,  352,   21,  500,   32,
 /*   850 */   166,  601,   93,  223,  318,  147,  324,  323,  272,  322,
 /*   860 */   166,  205,  285,   57,   58,   48,  582,  581,  583,  583,
 /*   870 */    55,   55,   56,   56,   56,   56,  412,   54,   54,   54,
 /*   880 */    54,   53,   53,   52,   52,   52,   51,  235,  312,  412,
 /*   890 */   262,  415,  412,  538,  360,  600,  360,  202,  142,  601,
 /*   900 */   100,  376,  412,  166,  415,  621,  540,  415,  360,  621,
 /*   910 */   141,  621,  601,   77,  230,  601,   96,  415,  590,  584,
 /*   920 */   341,  621,  530,  621,  529,  601,  137,  471,  382,  166,
 /*   930 */   460,  600,  170,  453,  427,  307,   28,   57,   58,   48,
 /*   940 */   582,  581,  583,  583,   55,   55,   56,   56,   56,   56,
 /*   950 */   412,   54,   54,   54,   54,   53,   53,   52,   52,   52,
 /*   960 */    51,  235,  312,  412,  503,  415,  412,  212,  459,  321,
 /*   970 */    35,  211,  127,  601,  136,  428,  412,  308,  415,  412,
 /*   980 */   273,  415,  222,  126,  255,   27,  601,  135,  377,  601,
 /*   990 */    76,  415,  590,  584,  415,  262,  220,   51,  235,  601,
 /*  1000 */    90,  600,  601,   89,  125,  600,  281,  522,  521,  373,
 /*  1010 */   621,   57,   46,   48,  582,  581,  583,  583,   55,   55,
 /*  1020 */    56,   56,   56,   56,  412,   54,   54,   54,   54,   53,
 /*  1030 */    53,   52,   52,   52,   51,  235,  312,  412,  451,  415,
 /*  1040 */   165,  624,  612,  611,  469,  521,  480,  601,   75,  185,
 /*  1050 */   412,  122,  415,  412,  369,  412,  621,  621,  621,  477,
 /*  1060 */   601,   88,  589,  588,  170,  415,  590,  584,  415,  121,
 /*  1070 */   415,  473,  259,  601,   87,  159,  601,   99,  601,   86,
 /*  1080 */   628,  332,  120,   14,  586,  585,   58,   48,  582,  581,
 /*  1090 */   583,  583,   55,   55,   56,   56,   56,   56,  412,   54,
 /*  1100 */    54,   54,   54,   53,   53,   52,   52,   52,   51,  235,
 /*  1110 */   312,  587,  412,  415,  412,  465,  262,  262,  610,  605,
 /*  1120 */   158,  601,   17,  157,  412,  462,   25,  415,  118,  415,
 /*  1130 */   412,  621,  621,  621,  621,  601,   85,  601,   84,  415,
 /*  1140 */   590,  584,  411,  262,   24,  415,  117,  601,   83,   10,
 /*  1150 */   351,    4,  115,  601,   72,  458,  456,  621,  621,  450,
 /*  1160 */   449,   48,  582,  581,  583,  583,   55,   55,   56,   56,
 /*  1170 */    56,   56,  253,   54,   54,   54,   54,   53,   53,   52,
 /*  1180 */    52,   52,   51,  235,   44,  406,  219,    3,  412,  452,
 /*  1190 */   262,  416,  622,  154,  594,  110,  107,  108,  401,  446,
 /*  1200 */    64,  557,  409,  415,  412,  621,  437,   44,  406,  621,
 /*  1210 */     3,  601,   71,  621,  416,  622,  621,  545,  335,  415,
 /*  1220 */   436,  404,  149,  239,  262,  409,  188,  601,   82,  331,
 /*  1230 */   541,  566,  621,  218,  421,  539,  229,  139,  124,  621,
 /*  1240 */   148,  419,  626,  625,  404,  621,  412,  238,  315,  123,
 /*  1250 */   621,   41,   42,  534,  566,  206,  412,  277,   43,  414,
 /*  1260 */   413,  415,  509,  595,  314,  615,  180,  245,  614,  601,
 /*  1270 */    81,  415,  621,  276,   41,   42,  613,  621,  412,  601,
 /*  1280 */    80,   43,  414,  413,  179,  270,  595,  418,  621,  600,
 /*  1290 */   484,    8,  177,  415,  593,  593,  593,  592,  591,   13,
 /*  1300 */   621,  601,   70,  417,  237,  621,   44,  406,  267,    3,
 /*  1310 */   237,  265,  342,  416,  622,  599,  296,  593,  593,  593,
 /*  1320 */   592,  591,   13,  621,  409,  412,  621,  412,  396,   34,
 /*  1330 */   406,  412,    3,   31,   30,  294,  416,  622,  293,  333,
 /*  1340 */   415,  263,  415,  404,  398,  258,  415,  409,  601,   18,
 /*  1350 */   601,   79,  363,  566,  601,   78,  621,  295,   60,   37,
 /*  1360 */   621,  172,  464,  390,  463,  598,  404,  621,  356,  288,
 /*  1370 */   232,   29,  556,   41,   42,  252,  566,  621,  415,  621,
 /*  1380 */    43,  414,  413,  621,  455,  595,  601,    9,  183,   61,
 /*  1390 */   621,  543,  445,  623,  622,  244,   41,   42,  241,  621,
 /*  1400 */   240,  393,  286,   43,  414,  413,  284,  621,  595,  431,
 /*  1410 */   621,  291,  537,  621,  536,  621,  593,  593,  593,  592,
 /*  1420 */   591,   13,  216,  144,  621,  387,  621,  304,  303,  302,
 /*  1430 */   178,  300,  394,  566,  454,  517,  290,  523,  621,  593,
 /*  1440 */   593,  593,  592,  591,   13,  518,  327,  621,  150,  279,
 /*  1450 */   243,  621,  514,  192,  191,  513,  512,  310,  128,  242,
 /*  1460 */   228,  526,  227,  226,  490,  595,  494,  489,  488,  309,
 /*  1470 */   194,  164,  152,  163,  467,  374,  481,  372,  153,  162,
 /*  1480 */   161,  151,  210,  479,  260,  370,   26,  478,  160,  468,
 /*  1490 */   364,  140,  119,  116,  131,  457,  593,  593,  593,  155,
 /*  1500 */   114,  346,  345,  113,  112,  111,  448,  109,  130,   23,
 /*  1510 */   319,   20,  434,  433,  432,   63,  429,  609,  190,  510,
 /*  1520 */   596,  405,  257,  344,  246,  297,  280,  573,  313,  570,
 /*  1530 */   195,  499,  498,  237,  497,  495,  381,  289,  461,  247,
 /*  1540 */   357,  254,  305,  343,    5,  447,  569,  209,  550,  371,
 /*  1550 */   508,  491,  402,  502,  501,  298,  337,  527,  525,  485,
 /*  1560 */   483,  235,

};
static const YYCODETYPE yy_lookahead[] = {
 /*     0 */    19,  169,  170,  171,   22,   24,   24,   26,   77,   78,
 /*    10 */    79,   80,   81,   82,   83,   84,   85,   86,   87,   88,
 /*    20 */    89,   90,   91,   92,   88,   89,   90,   91,   92,    1,
 /*    30 */    49,   50,   77,   78,   79,   80,  155,   82,   83,   84,
 /*    40 */    85,   86,   87,   88,   89,   90,   91,   92,   15,   68,
 /*    50 */    69,   70,   71,   72,   73,   74,   75,   76,   77,   78,
 /*    60 */    79,   80,  230,   82,   83,   84,   85,   86,   87,   88,
 /*    70 */    89,   90,   91,   92,   19,   94,   19,  105,  106,  107,
 /*    80 */    25,   82,   83,   84,   85,   86,   87,   88,   89,   90,
 /*    90 */    91,   92,   86,   87,   88,   89,   90,   91,   92,  150,
 /*   100 */    26,  150,   22,  116,   49,   50,   26,  158,  227,   54,
 /*   110 */   161,  162,  231,   22,  165,  128,  165,   26,   27,    7,

 /*   120 */     8,  170,  171,   68,   69,   70,   71,   72,   73,   74,
 /*   130 */    75,   76,   77,   78,   79,   80,   23,   82,   83,   84,
 /*   140 */    85,   86,   87,   88,   89,   90,   91,   92,   19,   92,
 /*   150 */     7,    8,    9,   96,   97,   98,   99,  100,  101,  102,
 /*   160 */   150,   32,   26,   27,   26,   27,  109,  150,   94,  150,
 /*   170 */    41,  161,  162,   22,   94,  165,   97,   98,   49,   50,
 /*   180 */   229,  230,  165,   19,  165,   94,   95,  170,  171,   26,
 /*   190 */    27,   27,  173,  174,  184,  185,  118,   68,   69,   70,

 /*   200 */    71,   72,   73,   74,   75,   76,   77,   78,   79,   80,
 /*   210 */   118,   82,   83,   84,   85,   86,   87,   88,   89,   90,
 /*   220 */    91,   92,   19,  150,   86,   87,   36,   24,  180,  181,
 /*   230 */    94,   95,   94,   95,  215,   97,  188,   66,  165,  220,
 /*   240 */   150,   51,  104,   23,  106,  113,  229,  230,   58,  117,
 /*   250 */   160,   88,   49,   50,   22,  165,  120,   94,   95,   99,

 /*   260 */   100,  101,   22,  173,  174,   94,  193,  129,  130,   98,
 /*   270 */   110,   68,   69,   70,   71,   72,   73,   74,   75,   76,
 /*   280 */    77,   78,   79,   80,  194,   82,   83,   84,   85,   86,
 /*   290 */    87,   88,   89,   90,   91,   92,   19,   11,  108,   12,
 /*   300 */   129,  130,  131,   98,  163,  215,  150,  166,  167,  168,
 /*   310 */   220,   26,   27,   22,  109,   28,   76,   26,   27,   50,
 /*   320 */    23,  165,   25,  169,  170,  171,   49,   50,  118,  173,
 /*   330 */   174,   44,  112,   46,  114,  115,   22,   23,   26,   27,

 /*   340 */   160,  129,  130,   57,   57,   68,   69,   70,   71,   72,
 /*   350 */    73,   74,   75,   76,   77,   78,   79,   80,   23,   82,
 /*   360 */    83,   84,   85,   86,   87,   88,   89,   90,   91,   92,
 /*   370 */    19,  215,  150,  104,  194,  150,  220,   25,   23,   94,
 /*   380 */    95,   67,  160,  118,  230,   94,   95,  165,   25,  150,
 /*   390 */   165,  105,  106,  107,  118,  173,  174,  217,  173,  174,

 /*   400 */    49,   50,  116,   57,  165,  120,   94,   95,   96,   26,

 /*   410 */    27,  166,  232,  136,   16,  113,  194,  237,  176,   68,
 /*   420 */    69,   70,   71,   72,   73,   74,   75,   76,   77,   78,
 /*   430 */    79,   80,   23,   82,   83,   84,   85,   86,   87,   88,
 /*   440 */    89,   90,   91,   92,   19,   32,   23,   95,   23,  224,
 /*   450 */   205,  105,  106,  107,   41,  216,  150,   23,   60,   25,
 /*   460 */    62,  150,  116,  221,  222,  223,  150,  112,  150,  114,
 /*   470 */   115,  165,  120,   23,   49,   50,  165,   94,   95,  173,
 /*   480 */   174,  165,  119,  165,  173,  174,   16,  136,  166,  173,

 /*   490 */   174,  173,  174,   68,   69,   70,   71,   72,   73,   74,
 /*   500 */    75,   76,   77,   78,   79,   80,   22,   82,   83,   84,
 /*   510 */    85,   86,   87,   88,   89,   90,   91,   92,   19,   11,
 /*   520 */   214,  112,   23,  114,  115,   12,  215,  205,   22,   95,
 /*   530 */    60,  215,   62,   88,   19,  112,  138,  114,  115,  197,
 /*   540 */   135,   28,  137,  221,  222,  223,  204,  172,   49,   50,
 /*   550 */    22,   23,   23,   25,  120,  180,   21,   44,  113,   46,
 /*   560 */    22,   23,  117,   25,   23,   50,  160,   68,   69,   70,

 /*   570 */    71,   72,   73,   74,   75,   76,   77,   78,   79,   80,
 /*   580 */    25,   82,   83,   84,   85,   86,   87,   88,   89,   90,
 /*   590 */    91,   92,   19,  150,  150,   67,   23,  160,   63,  150,
 /*   600 */   194,  221,  222,  223,  112,   67,  114,  115,  165,  165,
 /*   610 */   161,  162,  206,  207,  165,   25,   30,  173,  174,  104,
 /*   620 */    34,  241,   49,   50,  109,   86,   87,  142,  143,  144,
 /*   630 */   145,  194,   19,  176,   48,  100,  193,  105,  106,  107,

 /*   640 */    27,   68,   69,   70,   71,   72,   73,   74,   75,   76,
 /*   650 */    77,   78,   79,   80,  217,   82,   83,   84,   85,   86,
 /*   660 */    87,   88,   89,   90,   91,   92,   19,  150,  129,  130,
 /*   670 */    23,  150,   23,  138,  237,  206,  207,  150,  221,  222,
 /*   680 */   223,  126,  165,  150,  150,  242,  165,  150,  144,  145,
 /*   690 */   173,  174,  165,  103,  173,  174,   49,   50,  165,  165,
 /*   700 */   173,  174,  165,   22,   23,    0,    1,    2,   25,   25,

 /*   710 */   173,  174,   24,  120,   26,   68,   69,   70,   71,   72,
 /*   720 */    73,   74,   75,   76,   77,   78,   79,   80,  150,   82,
 /*   730 */    83,   84,   85,   86,   87,   88,   89,   90,   91,   92,
 /*   740 */    19,  150,  150,  165,  150,   24,  213,   97,   67,  166,
 /*   750 */   216,  173,  174,  166,  167,  168,  165,  165,   25,  165,
 /*   760 */   150,  150,  150,   35,  173,  174,  116,  173,  174,   35,

 /*   770 */    49,   50,  221,  222,  223,  165,  165,  165,  128,  187,

 /*   780 */    96,   22,   94,  173,  174,  173,  174,  160,  205,   68,
 /*   790 */    69,   70,   71,   72,   73,   74,   75,   76,   77,   78,
 /*   800 */    79,   80,  150,   82,   83,   84,   85,   86,   87,   88,
 /*   810 */    89,   90,   91,   92,   19,  150,  150,  165,  150,  150,
 /*   820 */   150,  194,  150,  166,  213,  173,  174,   23,  150,   25,
 /*   830 */   165,  165,  165,  165,  165,  165,   35,  165,  173,  174,
 /*   840 */   173,  173,  174,  165,   49,   50,  219,   52,   23,   25,
 /*   850 */    25,  173,  174,  187,  245,  246,  187,  187,   23,  187,

 /*   860 */    25,  160,  205,   68,   69,   70,   71,   72,   73,   74,
 /*   870 */    75,   76,   77,   78,   79,   80,  150,   82,   83,   84,
 /*   880 */    85,   86,   87,   88,   89,   90,   91,   92,   19,  150,
 /*   890 */   150,  165,  150,   27,  150,  194,  150,  160,  118,  173,
 /*   900 */   174,   23,  150,   25,  165,  165,  150,  165,  150,  165,
 /*   910 */    39,  165,  173,  174,   52,  173,  174,  165,   49,   50,
 /*   920 */   219,  165,   23,  165,   23,  173,  174,   23,   52,   25,
 /*   930 */    23,  194,   25,  193,  247,  248,   22,   68,   69,   70,

 /*   940 */    71,   72,   73,   74,   75,   76,   77,   78,   79,   80,
 /*   950 */   150,   82,   83,   84,   85,   86,   87,   88,   89,   90,
 /*   960 */    91,   92,   19,  150,   29,  165,  150,  160,   23,  213,
 /*   970 */    25,  160,   22,  173,  174,   23,  150,   25,  165,  150,
 /*   980 */    23,  165,  238,   22,  238,   22,  173,  174,   52,  173,
 /*   990 */   174,  165,   49,   50,  165,  150,  238,   91,   92,  173,
 /*  1000 */   174,  194,  173,  174,   22,  194,  109,  190,  191,   19,

 /*  1010 */   165,   68,   69,   70,   71,   72,   73,   74,   75,   76,
 /*  1020 */    77,   78,   79,   80,  150,   82,   83,   84,   85,   86,
 /*  1030 */    87,   88,   89,   90,   91,   92,   19,  150,  193,  165,
 /*  1040 */   102,  150,  150,  150,  190,  191,   20,  173,  174,   24,
 /*  1050 */   150,  104,  165,  150,   43,  150,  165,  165,  165,   59,
 /*  1060 */   173,  174,   49,   50,   25,  165,   49,   50,  165,   53,
 /*  1070 */   165,   53,  138,  173,  174,  104,  173,  174,  173,  174,
 /*  1080 */     1,    2,   22,    5,   71,   72,   69,   70,   71,   72,
 /*  1090 */    73,   74,   75,   76,   77,   78,   79,   80,  150,   82,
 /*  1100 */    83,   84,   85,   86,   87,   88,   89,   90,   91,   92,
 /*  1110 */    19,   98,  150,  165,  150,    1,  150,  150,  150,  150,
 /*  1120 */   118,  173,  174,   35,  150,   27,   76,  165,  108,  165,
 /*  1130 */   150,  165,  165,  165,  165,  173,  174,  173,  174,  165,
 /*  1140 */    49,   50,  150,  150,   76,  165,  127,  173,  174,   22,
 /*  1150 */    25,   22,  119,  173,  174,   23,    1,  165,  165,  193,
 /*  1160 */   193,   70,   71,   72,   73,   74,   75,   76,   77,   78,
 /*  1170 */    79,   80,   16,   82,   83,   84,   85,   86,   87,   88,
 /*  1180 */    89,   90,   91,   92,   19,   20,  193,   22,  150,   20,
 /*  1190 */   150,   26,   27,  121,  150,  119,  127,  108,  150,  128,
 /*  1200 */    16,  150,   37,  165,  150,  165,   23,   19,   20,  165,
 /*  1210 */    22,  173,  174,  165,   26,   27,  165,  150,   65,  165,
 /*  1220 */    23,   56,   15,  140,  150,   37,   22,  173,  174,    3,
 /*  1230 */   150,   66,  165,  193,    4,  150,  179,  164,  179,  165,
 /*  1240 */   246,  146,  147,  149,   56,  165,  150,  152,  249,  154,
 /*  1250 */   165,   86,   87,   88,   66,  160,  150,  150,   93,   94,
 /*  1260 */    95,  165,  150,   98,  249,  149,    6,  193,  149,  173,
 /*  1270 */   174,  165,  165,  150,   86,   87,   13,  165,  150,  173,
 /*  1280 */   174,   93,   94,   95,  151,  150,   98,  149,  165,  194,
 /*  1290 */   150,   25,  151,  165,  129,  130,  131,  132,  133,  134,
 /*  1300 */   165,  173,  174,  159,  116,  165,   19,   20,  150,   22,
 /*  1310 */   116,  150,  217,   26,   27,  194,  199,  129,  130,  131,
 /*  1320 */   132,  133,  134,  165,   37,  150,  165,  150,  123,   19,
 /*  1330 */    20,  150,   22,  124,  126,  201,   26,   27,  202,  244,
 /*  1340 */   165,  150,  165,   56,  122,  150,  165,   37,  173,  174,
 /*  1350 */   173,  174,  150,   66,  173,  174,  165,  200,  125,  135,
 /*  1360 */   165,  118,  150,  150,  150,  203,   56,  165,  150,  210,
 /*  1370 */   225,  104,  157,   86,   87,  150,   66,  165,  165,  165,
 /*  1380 */    93,   94,   95,  165,  150,   98,  173,  174,  157,   22,
 /*  1390 */   165,  211,  150,   26,   27,  150,   86,   87,  150,  165,
 /*  1400 */   150,  121,  210,   93,   94,   95,  210,  165,   98,  150,
 /*  1410 */   165,  150,  211,  165,  211,  165,  129,  130,  131,  132,
 /*  1420 */   133,  134,    5,  150,  165,  104,  165,   10,   11,   12,
 /*  1430 */    13,   14,  150,   66,   17,  183,  150,  175,  165,  129,
 /*  1440 */   130,  131,  132,  133,  134,  175,   47,  165,   31,  175,
 /*  1450 */    33,  165,  177,   86,   87,  103,  175,  178,   22,   42,
 /*  1460 */   228,   94,   92,  228,  175,   98,  183,  175,  175,  178,
 /*  1470 */   185,   96,   55,  156,   57,   18,  157,  157,   61,  156,
 /*  1480 */   156,   64,  157,  157,  235,   45,  135,  236,  156,  189,
 /*  1490 */   157,   68,  189,   22,  218,  199,  129,  130,  131,  156,
 /*  1500 */   192,  157,   18,  192,  192,  192,  199,  189,  218,  240,
 /*  1510 */   157,  240,   40,  157,  157,  243,   38,  153,  196,  181,
 /*  1520 */   166,  226,  105,  106,  107,  198,  176,  230,  111,  230,
 /*  1530 */   185,  176,  166,  116,  176,  166,  177,  209,  199,  209,
 /*  1540 */   239,  239,  148,  209,  196,  199,  166,  233,  208,  234,
 /*  1550 */   182,  186,  191,  182,  182,  195,  139,  173,  173,  186,
 /*  1560 */   186,   92,

};
#define YY_SHIFT_USE_DFLT (-70)
#define YY_SHIFT_COUNT (419)
#define YY_SHIFT_MIN   (-69)
#define YY_SHIFT_MAX   (1484)
static const short yy_shift_ofst[] = {
 /*     0 */  1079, 1188, 1417, 1188, 1287, 1287,  138,  138,  312,  -19,
 /*    10 */  1287, 1287, 1287, 1287,  346,  383,  129,  129,  795, 1165,
 /*    20 */  1287, 1287, 1287, 1287, 1287, 1287, 1287, 1287, 1287, 1287,
 /*    30 */  1287, 1287, 1287, 1287, 1287, 1287, 1287, 1287, 1287, 1287,
 /*    40 */  1287, 1287, 1287, 1287, 1287, 1287, 1287, 1287, 1310, 1287,
 /*    50 */  1287, 1287, 1287, 1287, 1287, 1287, 1287, 1287, 1287, 1287,
 /*    60 */  1287, 1287,  286,  383,  383,  539,  539,   74, 1194,   55,
 /*    70 */   721,  647,  573,  499,  425,  351,  277,  203,  869,  869,
 /*    80 */   869,  869,  869,  869,  869,  869,  869,  869,  869,  869,
 /*    90 */   869,  869,  869,  943,  869, 1017, 1091, 1091,  -69,  -45,
 /*   100 */   -45,  -45,  -45,  -45,   -1,    6,  -64,  383,  383,  383,
 /*   110 */   383,  383,  383,  383,  383,  383,  383,  383,  383,  383,
 /*   120 */   383,  383,  383,  535,  515,  383,  383,  383,  383,  383,
 /*   130 */   650,  -13,   74,  906, 1469,  -70,  -70,  -70, 1367,   57,
 /*   140 */   287,  287,  163,  291,  285,  136,   91,  538,  528,  383,
 /*   150 */   383,  383,  383,  383,  383,  383,  383,  383,  383,  383,
 /*   160 */   383,  383,  383,  383,  383,  383,  383,  383,  383,  383,
 /*   170 */   383,  383,  383,  383,  383,  383,  383,  383,  383,  383,
 /*   180 */   383,  688,  688,  688,  705, 1194, 1194, 1194,  -70,  -70,
 /*   190 */   -70,  171,  171,  160,  160,  160,  190,  190,  190,  434,
 /*   200 */   423,  513,  409,  355,  220,  492,  492,  492,  492,  532,
 /*   210 */   586,  492,  492,  352,   80,  445,  143,  555,  164,  164,
 /*   220 */   613,  555,  613,  590,  684,   74,  413,   74,  413,  269,
 /*   230 */   413,  164,  405,  212,  212,   74,  363,  132,  -18, 1478,
 /*   240 */  1243, 1243, 1472, 1472, 1243, 1471, 1423, 1208, 1484, 1484,
 /*   250 */  1484, 1484, 1243, 1457, 1208, 1471, 1423, 1423, 1243, 1457,
 /*   260 */  1351, 1440, 1243, 1243, 1457, 1243, 1457, 1243, 1457, 1375,
 /*   270 */  1436, 1321, 1321, 1321, 1399, 1370, 1370, 1436, 1321, 1352,
 /*   280 */  1321, 1399, 1321, 1321, 1280, 1267, 1280, 1267, 1280, 1267,
 /*   290 */  1243, 1243, 1224, 1233, 1222, 1209, 1205, 1208, 1194, 1266,
 /*   300 */  1263, 1263, 1260, 1260, 1260, 1260,  -70,  -70,  -70,  -70,
 /*   310 */   -70,  -70, 1013,  398,  681,  314,  470,  -28,  952,  240,
 /*   320 */   945,  907,  904,  878,  835,  825,   79,  112,  205,  804,
 /*   330 */   297, 1230, 1226, 1204, 1083, 1207, 1153, 1184, 1197, 1183,
 /*   340 */  1071, 1125, 1069, 1089, 1076, 1169, 1072, 1156, 1155, 1033,
 /*   350 */  1132, 1129, 1125, 1127, 1019, 1068, 1050, 1020, 1098, 1088,
 /*   360 */  1002, 1114, 1078, 1060,  971,  934, 1018, 1039, 1016, 1000,
 /*   370 */  1011,  947, 1025, 1026,  990,  897,  938,  982,  936,  963,
 /*   380 */   961,  957,  950,  876,  935,  914,  862,  871,  901,  899,
 /*   390 */   780,  866,  801,  759,  593,  733,  734,  824,  728,  733,
 /*   400 */   649,  541,  683,  529,  506,  508,  484,  450,  335,  232,
 /*   410 */   302,  276,  265,  210,   92,   78,  151,  113,   33,   28,
};
#define YY_REDUCE_USE_DFLT (-169)
#define YY_REDUCE_COUNT (311)
#define YY_REDUCE_MIN   (-168)
#define YY_REDUCE_MAX   (1394)
static const short yy_reduce_ofst[] = {
 /*     0 */   485,   90, 1095,  222,  156,   19,   17,  -49,   10,  322,
 /*    10 */   316,  311,  306,  225,  180,  -51,  457,  242,  380, 1213,
 /*    20 */  1181, 1177, 1175, 1128, 1106, 1096, 1054, 1038,  980,  974,
 /*    30 */   964,  962,  948,  905,  903,  900,  887,  874,  829,  826,
 /*    40 */   816,  813,  800,  752,  742,  739,  726,  678,  668,  665,
 /*    50 */   652,  612,  610,  594,  591,  578,  537,  527,  521,  517,
 /*    60 */   444,  318,  437,  449,  443,  154, -168,  141,  406,  551,
 /*    70 */   551,  551,  551,  551,  551,  551,  551,  551,  551,  551,
 /*    80 */   551,  551,  551,  551,  551,  551,  551,  551,  551,  551,
 /*    90 */   551,  551,  551,  551,  551,  551,  551,  551,  551,  551,
 /*   100 */   551,  551,  551,  551,  551,  551,  551, 1074,  534, 1040,
 /*   110 */   993,  967,  966,  845,  740,  758,  756,  746,  239,  744,
 /*   120 */   672,  611,   73, -119,   48,  670,  669,  666,  592,  533,
 /*   130 */   701,  627,  587,  551,  551,  551,  551,  551,  667,  375,
 /*   140 */   854,  817,  992, 1286, 1282, 1273, 1261,  687,  687, 1259,
 /*   150 */  1250, 1248, 1245, 1242, 1234, 1225, 1218, 1214, 1212, 1202,
 /*   160 */  1195, 1191, 1161, 1158, 1140, 1135, 1123, 1112, 1107, 1085,
 /*   170 */  1080, 1067, 1051, 1048, 1044,  992,  969,  968,  893,  892,
 /*   180 */   891,  657,  583,  245,  544,  811,  807,  737,  609,  469,
 /*   190 */   342, 1385, 1384, 1374, 1373, 1365, 1372, 1371, 1368, 1340,
 /*   200 */  1360, 1361, 1360, 1360, 1360, 1360, 1360, 1360, 1360, 1315,
 /*   210 */  1314, 1360, 1360, 1340, 1380, 1348, 1394, 1346, 1334, 1330,
 /*   220 */  1302, 1339, 1301, 1359, 1345, 1369, 1358, 1366, 1355, 1338,
 /*   230 */  1350, 1328, 1295, 1299, 1297, 1354, 1327, 1322, 1364, 1272,
 /*   240 */  1357, 1356, 1271, 1269, 1353, 1290, 1318, 1307, 1313, 1312,
 /*   250 */  1311, 1308, 1344, 1343, 1296, 1276, 1303, 1300, 1333, 1332,
 /*   260 */  1251, 1249, 1326, 1325, 1324, 1320, 1323, 1319, 1317, 1285,
 /*   270 */  1291, 1293, 1292, 1289, 1283, 1235, 1232, 1279, 1281, 1275,
 /*   280 */  1274, 1252, 1270, 1262, 1203, 1196, 1201, 1192, 1180, 1159,
 /*   290 */  1231, 1215, 1145, 1162, 1136, 1134, 1157, 1117, 1121, 1144,
 /*   300 */  1141, 1133, 1138, 1119, 1116, 1094, 1015,  999,  994, 1059,
 /*   310 */  1057, 1073,
};
static const YYACTIONTYPE yy_default[] = {

 /*     0 */   635,  869,  957,  957,  869,  869,  957,  957,  722,  759,
 /*    10 */   957,  957,  957,  867,  957,  957,  787,  787,  931,  957,
 /*    20 */   957,  957,  957,  957,  957,  957,  957,  957,  957,  957,
 /*    30 */   957,  957,  957,  957,  957,  957,  957,  957,  957,  957,
 /*    40 */   957,  957,  957,  957,  957,  957,  957,  957,  957,  957,
 /*    50 */   957,  957,  957,  957,  957,  957,  957,  957,  957,  957,
 /*    60 */   957,  957,  957,  957,  957,  957,  957,  674,  763,  793,
 /*    70 */   957,  957,  957,  957,  957,  957,  957,  957,  930,  932,
 /*    80 */   801,  800,  910,  774,  798,  791,  795,  870,  863,  864,
 /*    90 */   862,  866,  871,  957,  794,  830,  847,  829,  841,  846,
 /*   100 */   853,  845,  842,  832,  831,  833,  834,  957,  957,  957,
 /*   110 */   957,  957,  957,  957,  957,  957,  957,  957,  957,  957,
 /*   120 */   957,  957,  957,  661,  728,  957,  957,  957,  957,  957,
 /*   130 */   957,  957,  957,  835,  836,  850,  849,  848,  957,  666,
 /*   140 */   957,  957,  957,  957,  957,  957,  957,  957,  957,  957,
 /*   150 */   937,  935,  957,  882,  957,  957,  957,  957,  957,  957,
 /*   160 */   957,  957,  957,  957,  957,  957,  957,  957,  957,  957,
 /*   170 */   957,  957,  957,  957,  957,  957,  957,  957,  957,  957,
 /*   180 */   641,  759,  759,  759,  635,  957,  957,  957,  949,  763,
 /*   190 */   753,  957,  957,  957,  957,  718,  957,  957,  957,  957,
 /*   200 */   957,  957,  957,  957,  957,  803,  742,  920,  922,  957,
 /*   210 */   903,  740,  663,  761,  676,  751,  643,  797,  776,  776,
 /*   220 */   915,  797,  915,  699,  722,  957,  787,  957,  787,  696,
 /*   230 */   787,  776,  865,  957,  957,  957,  760,  751,  957,  942,
 /*   240 */   767,  767,  934,  934,  767,  809,  732,  797,  739,  739,
 /*   250 */   739,  739,  767,  658,  797,  809,  732,  732,  767,  658,
 /*   260 */   909,  907,  767,  767,  658,  767,  658,  767,  658,  722,
 /*   270 */   875,  730,  730,  730,  714,  879,  879,  875,  730,  699,
 /*   280 */   730,  714,  730,  730,  780,  775,  780,  775,  780,  775,
 /*   290 */   767,  767,  957,  792,  781,  790,  788,  797,  957,  717,
 /*   300 */   651,  651,  640,  640,  640,  640,  954,  954,  949,  701,
 /*   310 */   701,  684,  957,  957,  957,  957,  957,  957,  957,  884,
 /*   320 */   957,  957,  957,  957,  957,  957,  957,  957,  957,  957,
 /*   330 */   957,  957,  636,  944,  957,  957,  941,  957,  957,  957,
 /*   340 */   957,  802,  957,  957,  957,  957,  957,  957,  957,  957,
 /*   350 */   957,  957,  919,  957,  957,  957,  957,  957,  957,  957,
 /*   360 */   913,  957,  957,  957,  957,  957,  957,  906,  905,  957,
 /*   370 */   957,  957,  957,  957,  957,  957,  957,  957,  957,  957,
 /*   380 */   957,  957,  957,  957,  957,  957,  957,  957,  957,  957,
 /*   390 */   957,  957,  957,  957,  957,  789,  957,  782,  957,  868,
 /*   400 */   957,  957,  957,  957,  957,  957,  957,  957,  957,  957,
 /*   410 */   745,  818,  957,  817,  821,  816,  668,  957,  649,  957,
 /*   420 */   632,  637,  953,  956,  955,  952,  951,  950,  945,  943,
 /*   430 */   940,  939,  938,  936,  933,  929,  888,  886,  893,  892,
 /*   440 */   891,  890,  889,  887,  885,  883,  804,  799,  796,  928,
 /*   450 */   881,  741,  738,  737,  657,  946,  912,  921,  808,  807,
 /*   460 */   810,  918,  917,  916,  914,  911,  898,  806,  805,  733,
 /*   470 */   873,  872,  660,  902,  901,  900,  904,  908,  899,  769,
 /*   480 */   659,  656,  665,  721,  723,  719,  729,  727,  726,  725,
 /*   490 */   724,  720,  667,  675,  713,  698,  697,  878,  880,  877,
 /*   500 */   876,  706,  705,  711,  710,  709,  708,  707,  704,  703,
 /*   510 */   702,  695,  694,  700,  693,  716,  715,  712,  692,  736,

 /*   520 */   735,  734,  731,  691,  690,  689,  821,  688,  687,  827,
 /*   530 */   826,  814,  857,  756,  755,  754,  766,  765,  778,  777,
 /*   540 */   812,  811,  779,  764,  758,  757,  773,  772,  771,  770,
 /*   550 */   762,  752,  784,  786,  785,  783,  859,  768,  856,  927,
 /*   560 */   926,  925,  924,  923,  861,  860,  828,  825,  679,  680,
 /*   570 */   896,  895,  897,  894,  682,  681,  678,  677,  858,  747,
 /*   580 */   746,  854,  851,  843,  839,  855,  852,  844,  840,  838,

 /*   590 */   837,  823,  822,  820,  819,  815,  824,  670,  748,  744,
 /*   600 */   743,  813,  750,  749,  686,  685,  683,  664,  662,  655,
 /*   610 */   653,  652,  654,  650,  648,  647,  646,  645,  644,  673,
 /*   620 */   672,  671,  669,  668,  642,  639,  638,  634,  633,  631,
};

/* The next table maps tokens into fallback tokens.  If a construct
** like the following:
** 
**      %fallback ID X Y Z.
**
................................................................................
  "ecmd",          "explain",       "cmdx",          "cmd",         
  "transtype",     "trans_opt",     "nm",            "savepoint_opt",
  "create_table",  "create_table_args",  "createkw",      "temp",        
  "ifnotexists",   "dbnm",          "columnlist",    "conslist_opt",
  "select",        "column",        "columnid",      "type",        
  "carglist",      "id",            "ids",           "typetoken",   
  "typename",      "signed",        "plus_num",      "minus_num",   
  "ccons",         "term",          "expr",          "onconf",      
  "sortorder",     "autoinc",       "idxlist_opt",   "refargs",     
  "defer_subclause",  "refarg",        "refact",        "init_deferred_pred_opt",
  "conslist",      "cname",         "tcons",         "idxlist",     
  "defer_subclause_opt",  "orconf",        "resolvetype",   "raisetype",   
  "ifexists",      "fullname",      "oneselect",     "multiselect_op",
  "distinct",      "selcollist",    "from",          "where_opt",   
  "groupby_opt",   "having_opt",    "orderby_opt",   "limit_opt",   
  "sclp",          "as",            "seltablist",    "stl_prefix",  
  "joinop",        "indexed_opt",   "on_opt",        "using_opt",   
  "joinop2",       "inscollist",    "sortlist",      "nexprlist",   
................................................................................
 /*  46 */ "typetoken ::= typename",
 /*  47 */ "typetoken ::= typename LP signed RP",
 /*  48 */ "typetoken ::= typename LP signed COMMA signed RP",
 /*  49 */ "typename ::= ids",
 /*  50 */ "typename ::= typename ids",
 /*  51 */ "signed ::= plus_num",
 /*  52 */ "signed ::= minus_num",
 /*  53 */ "carglist ::= carglist ccons",
 /*  54 */ "carglist ::=",
 /*  55 */ "ccons ::= CONSTRAINT nm",

 /*  56 */ "ccons ::= DEFAULT term",
 /*  57 */ "ccons ::= DEFAULT LP expr RP",
 /*  58 */ "ccons ::= DEFAULT PLUS term",
 /*  59 */ "ccons ::= DEFAULT MINUS term",
 /*  60 */ "ccons ::= DEFAULT id",
 /*  61 */ "ccons ::= NULL onconf",
 /*  62 */ "ccons ::= NOT NULL onconf",
 /*  63 */ "ccons ::= PRIMARY KEY sortorder onconf autoinc",
 /*  64 */ "ccons ::= UNIQUE onconf",
 /*  65 */ "ccons ::= CHECK LP expr RP",
 /*  66 */ "ccons ::= REFERENCES nm idxlist_opt refargs",
 /*  67 */ "ccons ::= defer_subclause",
 /*  68 */ "ccons ::= COLLATE ids",
 /*  69 */ "autoinc ::=",
 /*  70 */ "autoinc ::= AUTOINCR",
 /*  71 */ "refargs ::=",
 /*  72 */ "refargs ::= refargs refarg",
 /*  73 */ "refarg ::= MATCH nm",
 /*  74 */ "refarg ::= ON INSERT refact",
 /*  75 */ "refarg ::= ON DELETE refact",
 /*  76 */ "refarg ::= ON UPDATE refact",
 /*  77 */ "refact ::= SET NULL",
 /*  78 */ "refact ::= SET DEFAULT",
 /*  79 */ "refact ::= CASCADE",
 /*  80 */ "refact ::= RESTRICT",
 /*  81 */ "refact ::= NO ACTION",
 /*  82 */ "defer_subclause ::= NOT DEFERRABLE init_deferred_pred_opt",
 /*  83 */ "defer_subclause ::= DEFERRABLE init_deferred_pred_opt",
 /*  84 */ "init_deferred_pred_opt ::=",
 /*  85 */ "init_deferred_pred_opt ::= INITIALLY DEFERRED",
 /*  86 */ "init_deferred_pred_opt ::= INITIALLY IMMEDIATE",
 /*  87 */ "conslist_opt ::=",
 /*  88 */ "conslist_opt ::= COMMA conslist cname",
 /*  89 */ "conslist ::= conslist COMMA cname tcons",
 /*  90 */ "conslist ::= conslist cname tcons",
 /*  91 */ "conslist ::= cname tcons",
 /*  92 */ "cname ::=",
 /*  93 */ "cname ::= CONSTRAINT nm",
 /*  94 */ "tcons ::= PRIMARY KEY LP idxlist autoinc RP onconf",
 /*  95 */ "tcons ::= UNIQUE LP idxlist RP onconf",
 /*  96 */ "tcons ::= CHECK LP expr RP onconf",
 /*  97 */ "tcons ::= FOREIGN KEY LP idxlist RP REFERENCES nm idxlist_opt refargs defer_subclause_opt",
 /*  98 */ "defer_subclause_opt ::=",
 /*  99 */ "defer_subclause_opt ::= defer_subclause",
 /* 100 */ "onconf ::=",
................................................................................
    */
    case 160: /* select */
    case 194: /* oneselect */
{
sqlite3SelectDelete(pParse->db, (yypminor->yy159));
}
      break;
    case 173: /* term */
    case 174: /* expr */
{
sqlite3ExprDelete(pParse->db, (yypminor->yy342).pExpr);
}
      break;
    case 178: /* idxlist_opt */
    case 187: /* idxlist */
    case 197: /* selcollist */
    case 200: /* groupby_opt */
    case 202: /* orderby_opt */
    case 204: /* sclp */
    case 214: /* sortlist */
    case 215: /* nexprlist */
................................................................................
  { 167, 6 },
  { 168, 1 },
  { 168, 2 },
  { 169, 1 },
  { 169, 1 },
  { 164, 2 },
  { 164, 0 },
  { 172, 2 },
  { 172, 2 },

  { 172, 4 },
  { 172, 3 },
  { 172, 3 },
  { 172, 2 },
  { 172, 2 },
  { 172, 3 },
  { 172, 5 },
  { 172, 2 },
  { 172, 4 },
  { 172, 4 },
  { 172, 1 },
  { 172, 2 },
  { 177, 0 },
  { 177, 1 },
  { 179, 0 },
  { 179, 2 },
  { 181, 2 },
  { 181, 3 },
  { 181, 3 },
  { 181, 3 },
  { 182, 2 },
  { 182, 2 },
  { 182, 1 },
  { 182, 1 },
  { 182, 2 },
  { 180, 3 },
  { 180, 2 },
  { 183, 0 },
  { 183, 2 },
  { 183, 2 },
  { 159, 0 },
  { 159, 3 },
  { 184, 4 },
  { 184, 3 },
  { 184, 2 },
  { 185, 0 },
  { 185, 2 },
  { 186, 7 },
  { 186, 5 },
  { 186, 5 },
  { 186, 10 },
  { 188, 0 },
  { 188, 1 },
  { 175, 0 },
  { 175, 3 },
  { 189, 0 },
  { 189, 2 },
  { 190, 1 },
  { 190, 1 },
  { 190, 1 },
  { 147, 4 },
  { 192, 2 },
................................................................................
  { 209, 2 },
  { 211, 4 },
  { 211, 0 },
  { 202, 0 },
  { 202, 3 },
  { 214, 4 },
  { 214, 2 },
  { 176, 1 },
  { 176, 1 },
  { 176, 0 },
  { 200, 0 },
  { 200, 3 },
  { 201, 0 },
  { 201, 2 },
  { 203, 0 },
  { 203, 2 },
  { 203, 4 },
................................................................................
  { 217, 1 },
  { 219, 4 },
  { 219, 5 },
  { 218, 0 },
  { 218, 3 },
  { 213, 3 },
  { 213, 1 },
  { 174, 1 },
  { 174, 3 },
  { 173, 1 },
  { 174, 1 },
  { 174, 1 },
  { 174, 3 },
  { 174, 5 },
  { 173, 1 },
  { 173, 1 },
  { 174, 1 },
  { 174, 1 },
  { 174, 3 },
  { 174, 6 },
  { 174, 5 },
  { 174, 4 },
  { 173, 1 },
  { 174, 3 },
  { 174, 3 },
  { 174, 3 },
  { 174, 3 },
  { 174, 3 },
  { 174, 3 },
  { 174, 3 },
  { 174, 3 },
  { 221, 1 },
  { 221, 2 },
  { 221, 1 },
  { 221, 2 },
  { 174, 3 },
  { 174, 5 },
  { 174, 2 },
  { 174, 3 },
  { 174, 3 },
  { 174, 4 },
  { 174, 2 },
  { 174, 2 },
  { 174, 2 },
  { 174, 2 },
  { 222, 1 },
  { 222, 2 },
  { 174, 5 },
  { 223, 1 },
  { 223, 2 },
  { 174, 5 },
  { 174, 3 },
  { 174, 5 },
  { 174, 4 },
  { 174, 4 },
  { 174, 5 },
  { 225, 5 },
  { 225, 4 },
  { 226, 2 },
  { 226, 0 },
  { 224, 1 },
  { 224, 0 },
  { 220, 1 },
  { 220, 0 },
  { 215, 3 },
  { 215, 1 },
  { 147, 11 },
  { 227, 1 },
  { 227, 0 },
  { 178, 0 },
  { 178, 3 },
  { 187, 5 },
  { 187, 3 },
  { 228, 0 },
  { 228, 2 },
  { 147, 4 },
  { 147, 1 },
  { 147, 2 },
................................................................................
  { 239, 3 },
  { 239, 2 },
  { 237, 7 },
  { 237, 5 },
  { 237, 5 },
  { 237, 5 },
  { 237, 1 },
  { 174, 4 },
  { 174, 6 },
  { 191, 1 },
  { 191, 1 },
  { 191, 1 },
  { 147, 4 },
  { 147, 6 },
  { 147, 3 },
  { 241, 0 },
................................................................................
{
  pParse->db->lookaside.bEnabled = 0;
  yygotominor.yy0 = yymsp[0].minor.yy0;
}
        break;
      case 28: /* ifnotexists ::= */
      case 31: /* temp ::= */ yytestcase(yyruleno==31);
      case 69: /* autoinc ::= */ yytestcase(yyruleno==69);
      case 82: /* defer_subclause ::= NOT DEFERRABLE init_deferred_pred_opt */ yytestcase(yyruleno==82);
      case 84: /* init_deferred_pred_opt ::= */ yytestcase(yyruleno==84);
      case 86: /* init_deferred_pred_opt ::= INITIALLY IMMEDIATE */ yytestcase(yyruleno==86);
      case 98: /* defer_subclause_opt ::= */ yytestcase(yyruleno==98);
      case 109: /* ifexists ::= */ yytestcase(yyruleno==109);
      case 120: /* distinct ::= ALL */ yytestcase(yyruleno==120);
      case 121: /* distinct ::= */ yytestcase(yyruleno==121);
      case 221: /* between_op ::= BETWEEN */ yytestcase(yyruleno==221);
      case 224: /* in_op ::= IN */ yytestcase(yyruleno==224);
{yygotominor.yy392 = 0;}
        break;
      case 29: /* ifnotexists ::= IF NOT EXISTS */
      case 30: /* temp ::= TEMP */ yytestcase(yyruleno==30);
      case 70: /* autoinc ::= AUTOINCR */ yytestcase(yyruleno==70);
      case 85: /* init_deferred_pred_opt ::= INITIALLY DEFERRED */ yytestcase(yyruleno==85);
      case 108: /* ifexists ::= IF EXISTS */ yytestcase(yyruleno==108);
      case 119: /* distinct ::= DISTINCT */ yytestcase(yyruleno==119);
      case 222: /* between_op ::= NOT BETWEEN */ yytestcase(yyruleno==222);
      case 225: /* in_op ::= NOT IN */ yytestcase(yyruleno==225);
{yygotominor.yy392 = 1;}
        break;
      case 32: /* create_table_args ::= LP columnlist conslist_opt RP */
................................................................................
  yygotominor.yy0.n = (int)(pParse->sLastToken.z-yymsp[-2].minor.yy0.z) + pParse->sLastToken.n;
}
        break;
      case 37: /* columnid ::= nm */
{
  sqlite3AddColumn(pParse,&yymsp[0].minor.yy0);
  yygotominor.yy0 = yymsp[0].minor.yy0;
  pParse->constraintName.n = 0;
}
        break;
      case 38: /* id ::= ID */
      case 39: /* id ::= INDEXED */ yytestcase(yyruleno==39);
      case 40: /* ids ::= ID|STRING */ yytestcase(yyruleno==40);
      case 41: /* nm ::= id */ yytestcase(yyruleno==41);
      case 42: /* nm ::= STRING */ yytestcase(yyruleno==42);
................................................................................
  yygotominor.yy0.z = yymsp[-5].minor.yy0.z;
  yygotominor.yy0.n = (int)(&yymsp[0].minor.yy0.z[yymsp[0].minor.yy0.n] - yymsp[-5].minor.yy0.z);
}
        break;
      case 50: /* typename ::= typename ids */
{yygotominor.yy0.z=yymsp[-1].minor.yy0.z; yygotominor.yy0.n=yymsp[0].minor.yy0.n+(int)(yymsp[0].minor.yy0.z-yymsp[-1].minor.yy0.z);}
        break;
      case 55: /* ccons ::= CONSTRAINT nm */
      case 93: /* cname ::= CONSTRAINT nm */ yytestcase(yyruleno==93);
{pParse->constraintName = yymsp[0].minor.yy0;}
        break;
      case 56: /* ccons ::= DEFAULT term */
      case 58: /* ccons ::= DEFAULT PLUS term */ yytestcase(yyruleno==58);
{sqlite3AddDefaultValue(pParse,&yymsp[0].minor.yy342);}
        break;
      case 57: /* ccons ::= DEFAULT LP expr RP */
{sqlite3AddDefaultValue(pParse,&yymsp[-1].minor.yy342);}
        break;
      case 59: /* ccons ::= DEFAULT MINUS term */
{
  ExprSpan v;
  v.pExpr = sqlite3PExpr(pParse, TK_UMINUS, yymsp[0].minor.yy342.pExpr, 0, 0);
  v.zStart = yymsp[-1].minor.yy0.z;
  v.zEnd = yymsp[0].minor.yy342.zEnd;
  sqlite3AddDefaultValue(pParse,&v);
}
        break;
      case 60: /* ccons ::= DEFAULT id */
{
  ExprSpan v;
  spanExpr(&v, pParse, TK_STRING, &yymsp[0].minor.yy0);
  sqlite3AddDefaultValue(pParse,&v);
}
        break;
      case 62: /* ccons ::= NOT NULL onconf */
{sqlite3AddNotNull(pParse, yymsp[0].minor.yy392);}
        break;
      case 63: /* ccons ::= PRIMARY KEY sortorder onconf autoinc */
{sqlite3AddPrimaryKey(pParse,0,yymsp[-1].minor.yy392,yymsp[0].minor.yy392,yymsp[-2].minor.yy392);}
        break;
      case 64: /* ccons ::= UNIQUE onconf */
{sqlite3CreateIndex(pParse,0,0,0,0,yymsp[0].minor.yy392,0,0,0,0);}
        break;
      case 65: /* ccons ::= CHECK LP expr RP */
{sqlite3AddCheckConstraint(pParse,yymsp[-1].minor.yy342.pExpr);}
        break;
      case 66: /* ccons ::= REFERENCES nm idxlist_opt refargs */
{sqlite3CreateForeignKey(pParse,0,&yymsp[-2].minor.yy0,yymsp[-1].minor.yy442,yymsp[0].minor.yy392);}
        break;
      case 67: /* ccons ::= defer_subclause */
{sqlite3DeferForeignKey(pParse,yymsp[0].minor.yy392);}
        break;
      case 68: /* ccons ::= COLLATE ids */
{sqlite3AddCollateType(pParse, &yymsp[0].minor.yy0);}
        break;
      case 71: /* refargs ::= */
{ yygotominor.yy392 = OE_None*0x0101; /* EV: R-19803-45884 */}
        break;
      case 72: /* refargs ::= refargs refarg */
{ yygotominor.yy392 = (yymsp[-1].minor.yy392 & ~yymsp[0].minor.yy207.mask) | yymsp[0].minor.yy207.value; }
        break;
      case 73: /* refarg ::= MATCH nm */
      case 74: /* refarg ::= ON INSERT refact */ yytestcase(yyruleno==74);
{ yygotominor.yy207.value = 0;     yygotominor.yy207.mask = 0x000000; }
        break;
      case 75: /* refarg ::= ON DELETE refact */
{ yygotominor.yy207.value = yymsp[0].minor.yy392;     yygotominor.yy207.mask = 0x0000ff; }
        break;
      case 76: /* refarg ::= ON UPDATE refact */
{ yygotominor.yy207.value = yymsp[0].minor.yy392<<8;  yygotominor.yy207.mask = 0x00ff00; }
        break;
      case 77: /* refact ::= SET NULL */
{ yygotominor.yy392 = OE_SetNull;  /* EV: R-33326-45252 */}
        break;
      case 78: /* refact ::= SET DEFAULT */
{ yygotominor.yy392 = OE_SetDflt;  /* EV: R-33326-45252 */}
        break;
      case 79: /* refact ::= CASCADE */
{ yygotominor.yy392 = OE_Cascade;  /* EV: R-33326-45252 */}
        break;
      case 80: /* refact ::= RESTRICT */
{ yygotominor.yy392 = OE_Restrict; /* EV: R-33326-45252 */}
        break;
      case 81: /* refact ::= NO ACTION */
{ yygotominor.yy392 = OE_None;     /* EV: R-33326-45252 */}
        break;
      case 83: /* defer_subclause ::= DEFERRABLE init_deferred_pred_opt */
      case 99: /* defer_subclause_opt ::= defer_subclause */ yytestcase(yyruleno==99);
      case 101: /* onconf ::= ON CONFLICT resolvetype */ yytestcase(yyruleno==101);
      case 104: /* resolvetype ::= raisetype */ yytestcase(yyruleno==104);
{yygotominor.yy392 = yymsp[0].minor.yy392;}
        break;
      case 87: /* conslist_opt ::= */
{yygotominor.yy0.n = 0; yygotominor.yy0.z = 0;}
        break;
      case 88: /* conslist_opt ::= COMMA conslist cname */
{yygotominor.yy0 = yymsp[-2].minor.yy0;}
        break;
      case 92: /* cname ::= */
{pParse->constraintName.n = 0;}
        break;
      case 94: /* tcons ::= PRIMARY KEY LP idxlist autoinc RP onconf */
{sqlite3AddPrimaryKey(pParse,yymsp[-3].minor.yy442,yymsp[0].minor.yy392,yymsp[-2].minor.yy392,0);}
        break;
      case 95: /* tcons ::= UNIQUE LP idxlist RP onconf */
{sqlite3CreateIndex(pParse,0,0,0,yymsp[-2].minor.yy442,yymsp[0].minor.yy392,0,0,0,0);}
        break;
................................................................................
      case 204: /* expr ::= expr PLUS|MINUS expr */ yytestcase(yyruleno==204);
      case 205: /* expr ::= expr STAR|SLASH|REM expr */ yytestcase(yyruleno==205);
      case 206: /* expr ::= expr CONCAT expr */ yytestcase(yyruleno==206);
{spanBinaryExpr(&yygotominor.yy342,pParse,yymsp[-1].major,&yymsp[-2].minor.yy342,&yymsp[0].minor.yy342);}
        break;
      case 207: /* likeop ::= LIKE_KW */
      case 209: /* likeop ::= MATCH */ yytestcase(yyruleno==209);
{yygotominor.yy318.eOperator = yymsp[0].minor.yy0; yygotominor.yy318.bNot = 0;}
        break;
      case 208: /* likeop ::= NOT LIKE_KW */
      case 210: /* likeop ::= NOT MATCH */ yytestcase(yyruleno==210);
{yygotominor.yy318.eOperator = yymsp[0].minor.yy0; yygotominor.yy318.bNot = 1;}
        break;
      case 211: /* expr ::= expr likeop expr */
{
  ExprList *pList;
  pList = sqlite3ExprListAppend(pParse,0, yymsp[0].minor.yy342.pExpr);
  pList = sqlite3ExprListAppend(pParse,pList, yymsp[-2].minor.yy342.pExpr);
  yygotominor.yy342.pExpr = sqlite3ExprFunction(pParse, pList, &yymsp[-1].minor.yy318.eOperator);
  if( yymsp[-1].minor.yy318.bNot ) yygotominor.yy342.pExpr = sqlite3PExpr(pParse, TK_NOT, yygotominor.yy342.pExpr, 0, 0);
  yygotominor.yy342.zStart = yymsp[-2].minor.yy342.zStart;
  yygotominor.yy342.zEnd = yymsp[0].minor.yy342.zEnd;
  if( yygotominor.yy342.pExpr ) yygotominor.yy342.pExpr->flags |= EP_InfixFunc;
}
        break;
      case 212: /* expr ::= expr likeop expr ESCAPE expr */
{
  ExprList *pList;
  pList = sqlite3ExprListAppend(pParse,0, yymsp[-2].minor.yy342.pExpr);
  pList = sqlite3ExprListAppend(pParse,pList, yymsp[-4].minor.yy342.pExpr);
  pList = sqlite3ExprListAppend(pParse,pList, yymsp[0].minor.yy342.pExpr);
  yygotominor.yy342.pExpr = sqlite3ExprFunction(pParse, pList, &yymsp[-3].minor.yy318.eOperator);
  if( yymsp[-3].minor.yy318.bNot ) yygotominor.yy342.pExpr = sqlite3PExpr(pParse, TK_NOT, yygotominor.yy342.pExpr, 0, 0);
  yygotominor.yy342.zStart = yymsp[-4].minor.yy342.zStart;
  yygotominor.yy342.zEnd = yymsp[0].minor.yy342.zEnd;
  if( yygotominor.yy342.pExpr ) yygotominor.yy342.pExpr->flags |= EP_InfixFunc;
}
        break;
      case 213: /* expr ::= expr ISNULL|NOTNULL */
{spanUnaryPostfix(&yygotominor.yy342,pParse,yymsp[0].major,&yymsp[-1].minor.yy342,&yymsp[0].minor.yy0);}
................................................................................
      /* (21) savepoint_opt ::= */ yytestcase(yyruleno==21);
      /* (25) cmd ::= create_table create_table_args */ yytestcase(yyruleno==25);
      /* (34) columnlist ::= columnlist COMMA column */ yytestcase(yyruleno==34);
      /* (35) columnlist ::= column */ yytestcase(yyruleno==35);
      /* (44) type ::= */ yytestcase(yyruleno==44);
      /* (51) signed ::= plus_num */ yytestcase(yyruleno==51);
      /* (52) signed ::= minus_num */ yytestcase(yyruleno==52);
      /* (53) carglist ::= carglist ccons */ yytestcase(yyruleno==53);
      /* (54) carglist ::= */ yytestcase(yyruleno==54);


      /* (61) ccons ::= NULL onconf */ yytestcase(yyruleno==61);
      /* (89) conslist ::= conslist COMMA cname tcons */ yytestcase(yyruleno==89);
      /* (90) conslist ::= conslist cname tcons */ yytestcase(yyruleno==90);
      /* (91) conslist ::= cname tcons */ yytestcase(yyruleno==91);


      /* (277) foreach_clause ::= */ yytestcase(yyruleno==277);
      /* (278) foreach_clause ::= FOR EACH ROW */ yytestcase(yyruleno==278);
      /* (285) tridxby ::= */ yytestcase(yyruleno==285);
      /* (303) database_kw_opt ::= DATABASE */ yytestcase(yyruleno==303);
      /* (304) database_kw_opt ::= */ yytestcase(yyruleno==304);
      /* (312) kwcolumn_opt ::= */ yytestcase(yyruleno==312);
      /* (313) kwcolumn_opt ::= COLUMNKW */ yytestcase(yyruleno==313);
................................................................................
**
** FTS3 used to optionally store character offsets using a compile-time
** option.  But that functionality is no longer supported.
**
** A doclist is stored like this:
**
** array {
**   varint docid;          (delta from previous doclist)
**   array {                (position list for column 0)
**     varint position;     (2 more than the delta from previous position)
**   }
**   array {
**     varint POS_COLUMN;   (marks start of position list for new column)
**     varint column;       (index of new column)
**     array {
................................................................................
**   value:     123 5 9 1 1 14 35 0 234 72 0
**
** The 123 value is the first docid.  For column zero in this document
** there are two matches at positions 3 and 10 (5-2 and 9-2+3).  The 1
** at D signals the start of a new column; the 1 at E indicates that the
** new column is column number 1.  There are two positions at 12 and 45
** (14-2 and 35-2+12).  The 0 at H indicate the end-of-document.  The
** 234 at I is the delta to next docid (357).  It has one position 70
** (72-2) and then terminates with the 0 at K.
**
** A "position-list" is the list of positions for multiple columns for
** a single docid.  A "column-list" is the set of positions for a single
** column.  Hence, a position-list consists of one or more column-lists,
** a document record consists of a docid followed by a position-list and
** a doclist consists of one or more document records.
**
................................................................................
*/
#define SizeofArray(X) ((int)(sizeof(X)/sizeof(X[0])))


#ifndef MIN
# define MIN(x,y) ((x)<(y)?(x):(y))
#endif
#ifndef MAX
# define MAX(x,y) ((x)>(y)?(x):(y))
#endif

/*
** Maximum length of a varint encoded integer. The varint format is different
** from that used by SQLite, so the maximum length is 10, not 9.
*/
#define FTS3_VARINT_MAX 10

................................................................................
** false.
*/
#ifdef SQLITE_COVERAGE_TEST
# define ALWAYS(x) (1)
# define NEVER(X)  (0)
#else
# define ALWAYS(x) (x)
# define NEVER(x)  (x)
#endif

/*
** Internal types used by SQLite.
*/
typedef unsigned char u8;         /* 1-byte (or larger) unsigned integer */
typedef short int i16;            /* 2-byte (or larger) signed integer */
typedef unsigned int u32;         /* 4-byte unsigned integer */
typedef sqlite3_uint64 u64;       /* 8-byte unsigned integer */
typedef sqlite3_int64 i64;        /* 8-byte signed integer */

/*
** Macro used to suppress compiler warnings for unused parameters.
*/
#define UNUSED_PARAMETER(x) (void)(x)

/*
................................................................................
  const char *zDb;                /* logical database name */
  const char *zName;              /* virtual table name */
  int nColumn;                    /* number of named columns in virtual table */
  char **azColumn;                /* column names.  malloced */
  sqlite3_tokenizer *pTokenizer;  /* tokenizer for inserts and queries */
  char *zContentTbl;              /* content=xxx option, or NULL */
  char *zLanguageid;              /* languageid=xxx option, or NULL */
  u8 bAutoincrmerge;              /* True if automerge=1 */
  u32 nLeafAdd;                   /* Number of leaf blocks added this trans */

  /* Precompiled statements used by the implementation. Each of these 
  ** statements is run and reset within a single virtual table API call. 
  */
  sqlite3_stmt *aStmt[37];

  char *zReadExprlist;
  char *zWriteExprlist;

  int nNodeSize;                  /* Soft limit for node size */
  u8 bFts4;                       /* True for FTS4, false for FTS3 */
  u8 bHasStat;                    /* True if %_stat table exists */
  u8 bHasDocsize;                 /* True if %_docsize table exists */
  u8 bDescIdx;                    /* True if doclists are in reverse order */
  u8 bIgnoreSavepoint;            /* True to ignore xSavepoint invocations */
  int nPgsz;                      /* Page size for host database */
  char *zSegmentsTbl;             /* Name of %_segments table */
  sqlite3_blob *pSegments;        /* Blob handle open on %_segments table */

  /* 

  ** The following array of hash tables is used to buffer pending index 
  ** updates during transactions. All pending updates buffered at any one
  ** time must share a common language-id (see the FTS4 langid= feature).
  ** The current language id is stored in variable iPrevLangid.



  **
  ** A single FTS4 table may have multiple full-text indexes. For each index
  ** there is an entry in the aIndex[] array. Index 0 is an index of all the
  ** terms that appear in the document set. Each subsequent index in aIndex[]
  ** is an index of prefixes of a specific length.
  **
  ** Variable nPendingData contains an estimate the memory consumed by the 
  ** pending data structures, including hash table overhead, but not including
  ** malloc overhead.  When nPendingData exceeds nMaxPendingData, all hash
  ** tables are flushed to disk. Variable iPrevDocid is the docid of the most 
  ** recently inserted record.
  */
  int nIndex;                     /* Size of aIndex[] */
  struct Fts3Index {
    int nPrefix;                  /* Prefix length (0 for main terms index) */
    Fts3Hash hPending;            /* Pending terms table for this index */
  } *aIndex;
  int nMaxPendingData;            /* Max pending data before flush to disk */
................................................................................
SQLITE_PRIVATE int sqlite3Fts3SelectDocsize(Fts3Table *, sqlite3_int64, sqlite3_stmt **);

SQLITE_PRIVATE void sqlite3Fts3FreeDeferredTokens(Fts3Cursor *);
SQLITE_PRIVATE int sqlite3Fts3DeferToken(Fts3Cursor *, Fts3PhraseToken *, int);
SQLITE_PRIVATE int sqlite3Fts3CacheDeferredDoclists(Fts3Cursor *);
SQLITE_PRIVATE void sqlite3Fts3FreeDeferredDoclists(Fts3Cursor *);
SQLITE_PRIVATE void sqlite3Fts3SegmentsClose(Fts3Table *);
SQLITE_PRIVATE int sqlite3Fts3MaxLevel(Fts3Table *, int *);

/* Special values interpreted by sqlite3SegReaderCursor() */
#define FTS3_SEGCURSOR_PENDING        -1
#define FTS3_SEGCURSOR_ALL            -2

SQLITE_PRIVATE int sqlite3Fts3SegReaderStart(Fts3Table*, Fts3MultiSegReader*, Fts3SegFilter*);
SQLITE_PRIVATE int sqlite3Fts3SegReaderStep(Fts3Table *, Fts3MultiSegReader *);
................................................................................
  /* Output values. Valid only after Fts3SegReaderStep() returns SQLITE_ROW. */
  char *zTerm;                    /* Pointer to term buffer */
  int nTerm;                      /* Size of zTerm in bytes */
  char *aDoclist;                 /* Pointer to doclist buffer */
  int nDoclist;                   /* Size of aDoclist[] in bytes */
};

SQLITE_PRIVATE int sqlite3Fts3Incrmerge(Fts3Table*,int,int);

/* fts3.c */
SQLITE_PRIVATE int sqlite3Fts3PutVarint(char *, sqlite3_int64);
SQLITE_PRIVATE int sqlite3Fts3GetVarint(const char *, sqlite_int64 *);
SQLITE_PRIVATE int sqlite3Fts3GetVarint32(const char *, int *);
SQLITE_PRIVATE int sqlite3Fts3VarintLen(sqlite3_uint64);
SQLITE_PRIVATE void sqlite3Fts3Dequote(char *);
SQLITE_PRIVATE void sqlite3Fts3DoclistPrev(int,char*,int,char**,sqlite3_int64*,int*,u8*);
SQLITE_PRIVATE int sqlite3Fts3EvalPhraseStats(Fts3Cursor *, Fts3Expr *, u32 *);
SQLITE_PRIVATE int sqlite3Fts3FirstFilter(sqlite3_int64, char *, int, char *);
SQLITE_PRIVATE void sqlite3Fts3CreateStatTable(int*, Fts3Table*);

/* fts3_tokenizer.c */
SQLITE_PRIVATE const char *sqlite3Fts3NextToken(const char *, int *);
SQLITE_PRIVATE int sqlite3Fts3InitHashTable(sqlite3 *, Fts3Hash *, const char *);
SQLITE_PRIVATE int sqlite3Fts3InitTokenizer(Fts3Hash *pHash, const char *, 
    sqlite3_tokenizer **, char **
);
................................................................................

SQLITE_PRIVATE void sqlite3Fts3EvalPhraseCleanup(Fts3Phrase *);

SQLITE_PRIVATE int sqlite3Fts3MsrIncrStart(
    Fts3Table*, Fts3MultiSegReader*, int, const char*, int);
SQLITE_PRIVATE int sqlite3Fts3MsrIncrNext(
    Fts3Table *, Fts3MultiSegReader *, sqlite3_int64 *, char **, int *);
SQLITE_PRIVATE int sqlite3Fts3EvalPhrasePoslist(Fts3Cursor *, Fts3Expr *, int iCol, char **); 
SQLITE_PRIVATE int sqlite3Fts3MsrOvfl(Fts3Cursor *, Fts3MultiSegReader *, int *);
SQLITE_PRIVATE int sqlite3Fts3MsrIncrRestart(Fts3MultiSegReader *pCsr);

SQLITE_PRIVATE int sqlite3Fts3DeferredTokenList(Fts3DeferredToken *, char **, int *);

#endif /* !SQLITE_CORE || SQLITE_ENABLE_FTS3 */
#endif /* _FTSINT_H */
................................................................................
    }

    sqlite3_free(zSql);
    sqlite3_free(zCols);
    *pRc = rc;
  }
}

/*
** Create the %_stat table if it does not already exist.
*/
SQLITE_PRIVATE void sqlite3Fts3CreateStatTable(int *pRc, Fts3Table *p){
  fts3DbExec(pRc, p->db, 
      "CREATE TABLE IF NOT EXISTS %Q.'%q_stat'"
          "(id INTEGER PRIMARY KEY, value BLOB);",
      p->zDb, p->zName
  );
  if( (*pRc)==SQLITE_OK ) p->bHasStat = 1;
}

/*
** Create the backing store tables (%_content, %_segments and %_segdir)
** required by the FTS3 table passed as the only argument. This is done
** as part of the vtab xCreate() method.
**
** If the p->bHasDocsize boolean is true (indicating that this is an
................................................................................
  );
  if( p->bHasDocsize ){
    fts3DbExec(&rc, db, 
        "CREATE TABLE %Q.'%q_docsize'(docid INTEGER PRIMARY KEY, size BLOB);",
        p->zDb, p->zName
    );
  }
  assert( p->bHasStat==p->bFts4 );
  if( p->bHasStat ){

    sqlite3Fts3CreateStatTable(&rc, p);


  }
  return rc;
}

/*
** Store the current database page-size in bytes in p->nPgsz.
**
................................................................................
  p->nColumn = nCol;
  p->nPendingData = 0;
  p->azColumn = (char **)&p[1];
  p->pTokenizer = pTokenizer;
  p->nMaxPendingData = FTS3_MAX_PENDING_DATA;
  p->bHasDocsize = (isFts4 && bNoDocsize==0);
  p->bHasStat = isFts4;
  p->bFts4 = isFts4;
  p->bDescIdx = bDescIdx;
  p->bAutoincrmerge = 0xff;   /* 0xff means setting unknown */
  p->zContentTbl = zContent;
  p->zLanguageid = zLanguageid;
  zContent = 0;
  zLanguageid = 0;
  TESTONLY( p->inTransaction = -1 );
  TESTONLY( p->mxSavepoint = -1 );

................................................................................

  /* If this is an xCreate call, create the underlying tables in the 
  ** database. TODO: For xConnect(), it could verify that said tables exist.
  */
  if( isCreate ){
    rc = fts3CreateTables(p);
  }

  /* Check to see if a legacy fts3 table has been "upgraded" by the
  ** addition of a %_stat table so that it can use incremental merge.
  */
  if( !isFts4 && !isCreate ){
    int rc2 = SQLITE_OK;
    fts3DbExec(&rc2, db, "SELECT 1 FROM %Q.'%q_stat' WHERE id=2",
               p->zDb, p->zName);
    if( rc2==SQLITE_OK ) p->bHasStat = 1;
  }

  /* Figure out the page-size for the database. This is required in order to
  ** estimate the cost of loading large doclists from the database.  */
  fts3DatabasePageSize(&rc, p);
  p->nNodeSize = p->nPgsz-35;

  /* Declare the table schema to SQLite. */
................................................................................

/*
** Set up a cursor object for iterating through a full-text index or a 
** single level therein.
*/
SQLITE_PRIVATE int sqlite3Fts3SegReaderCursor(
  Fts3Table *p,                   /* FTS3 table handle */
  int iLangid,                    /* Language-id to search */
  int iIndex,                     /* Index to search (from 0 to p->nIndex-1) */
  int iLevel,                     /* Level of segments to scan */
  const char *zTerm,              /* Term to query for */
  int nTerm,                      /* Size of zTerm in bytes */
  int isPrefix,                   /* True for a prefix search */
  int isScan,                     /* True to scan from zTerm to EOF */
  Fts3MultiSegReader *pCsr       /* Cursor object to populate */
................................................................................
      ||  iLevel==FTS3_SEGCURSOR_PENDING 
      ||  iLevel>=0
  );
  assert( iLevel<FTS3_SEGDIR_MAXLEVEL );
  assert( FTS3_SEGCURSOR_ALL<0 && FTS3_SEGCURSOR_PENDING<0 );
  assert( isPrefix==0 || isScan==0 );





  memset(pCsr, 0, sizeof(Fts3MultiSegReader));

  return fts3SegReaderCursor(
      p, iLangid, iIndex, iLevel, zTerm, nTerm, isPrefix, isScan, pCsr
  );
}

/*
** In addition to its current configuration, have the Fts3MultiSegReader
................................................................................
      return SQLITE_NOMEM;
    }

    pCsr->iLangid = 0;
    if( nVal==2 ) pCsr->iLangid = sqlite3_value_int(apVal[1]);

    rc = sqlite3Fts3ExprParse(p->pTokenizer, pCsr->iLangid,
        p->azColumn, p->bFts4, p->nColumn, iCol, zQuery, -1, &pCsr->pExpr
    );
    if( rc!=SQLITE_OK ){
      if( rc==SQLITE_ERROR ){
        static const char *zErr = "malformed MATCH expression: [%s]";
        p->base.zErrMsg = sqlite3_mprintf(zErr, zQuery);
      }
      return rc;
................................................................................
}

/*
** Implementation of xSync() method. Flush the contents of the pending-terms
** hash-table to the database.
*/
static int fts3SyncMethod(sqlite3_vtab *pVtab){

  /* Following an incremental-merge operation, assuming that the input
  ** segments are not completely consumed (the usual case), they are updated
  ** in place to remove the entries that have already been merged. This
  ** involves updating the leaf block that contains the smallest unmerged
  ** entry and each block (if any) between the leaf and the root node. So
  ** if the height of the input segment b-trees is N, and input segments
  ** are merged eight at a time, updating the input segments at the end
  ** of an incremental-merge requires writing (8*(1+N)) blocks. N is usually
  ** small - often between 0 and 2. So the overhead of the incremental
  ** merge is somewhere between 8 and 24 blocks. To avoid this overhead
  ** dwarfing the actual productive work accomplished, the incremental merge
  ** is only attempted if it will write at least 64 leaf blocks. Hence
  ** nMinMerge.
  **
  ** Of course, updating the input segments also involves deleting a bunch
  ** of blocks from the segments table. But this is not considered overhead
  ** as it would also be required by a crisis-merge that used the same input 
  ** segments.
  */
  const u32 nMinMerge = 64;       /* Minimum amount of incr-merge work to do */

  Fts3Table *p = (Fts3Table*)pVtab;
  int rc = sqlite3Fts3PendingTermsFlush(p);

  if( rc==SQLITE_OK && p->bAutoincrmerge==1 && p->nLeafAdd>(nMinMerge/16) ){
    int mxLevel = 0;              /* Maximum relative level value in db */
    int A;                        /* Incr-merge parameter A */

    rc = sqlite3Fts3MaxLevel(p, &mxLevel);
    assert( rc==SQLITE_OK || mxLevel==0 );
    A = p->nLeafAdd * mxLevel;
    A += (A/2);
    if( A>(int)nMinMerge ) rc = sqlite3Fts3Incrmerge(p, A, 8);
  }
  sqlite3Fts3SegmentsClose(p);
  return rc;
}

/*
** Implementation of xBegin() method. This is a no-op.
*/
static int fts3BeginMethod(sqlite3_vtab *pVtab){
  Fts3Table *p = (Fts3Table*)pVtab;
  UNUSED_PARAMETER(pVtab);
  assert( p->pSegments==0 );
  assert( p->nPendingData==0 );
  assert( p->inTransaction!=1 );
  TESTONLY( p->inTransaction = 1 );
  TESTONLY( p->mxSavepoint = -1; );
  p->nLeafAdd = 0;
  return SQLITE_OK;
}

/*
** Implementation of xCommit() method. This is a no-op. The contents of
** the pending-terms hash-table have already been flushed into the database
** by fts3SyncMethod().
................................................................................

/*
** The xSavepoint() method.
**
** Flush the contents of the pending-terms table to disk.
*/
static int fts3SavepointMethod(sqlite3_vtab *pVtab, int iSavepoint){
  int rc = SQLITE_OK;
  UNUSED_PARAMETER(iSavepoint);
  assert( ((Fts3Table *)pVtab)->inTransaction );
  assert( ((Fts3Table *)pVtab)->mxSavepoint < iSavepoint );
  TESTONLY( ((Fts3Table *)pVtab)->mxSavepoint = iSavepoint );
  if( ((Fts3Table *)pVtab)->bIgnoreSavepoint==0 ){
    rc = fts3SyncMethod(pVtab);
  }
  return rc;
}

/*
** The xRelease() method.
**
** This is a no-op.
*/
................................................................................
*/
SQLITE_PRIVATE void sqlite3Fts3DoclistPrev(
  int bDescIdx,                   /* True if the doclist is desc */
  char *aDoclist,                 /* Pointer to entire doclist */
  int nDoclist,                   /* Length of aDoclist in bytes */
  char **ppIter,                  /* IN/OUT: Iterator pointer */
  sqlite3_int64 *piDocid,         /* IN/OUT: Docid pointer */
  int *pnList,                    /* OUT: List length pointer */
  u8 *pbEof                       /* OUT: End-of-file flag */
){
  char *p = *ppIter;

  assert( nDoclist>0 );
  assert( *pbEof==0 );
  assert( p || *piDocid==0 );
................................................................................
      char *pSave = p;
      fts3ReversePoslist(aDoclist, &p);
      *pnList = (int)(pSave - p);
    }
    *ppIter = p;
  }
}

/*
** Iterate forwards through a doclist.
*/
SQLITE_PRIVATE void sqlite3Fts3DoclistNext(
  int bDescIdx,                   /* True if the doclist is desc */
  char *aDoclist,                 /* Pointer to entire doclist */
  int nDoclist,                   /* Length of aDoclist in bytes */
  char **ppIter,                  /* IN/OUT: Iterator pointer */
  sqlite3_int64 *piDocid,         /* IN/OUT: Docid pointer */
  u8 *pbEof                       /* OUT: End-of-file flag */
){
  char *p = *ppIter;

  assert( nDoclist>0 );
  assert( *pbEof==0 );
  assert( p || *piDocid==0 );
  assert( !p || (p>=aDoclist && p<=&aDoclist[nDoclist]) );

  if( p==0 ){
    p = aDoclist;
    p += sqlite3Fts3GetVarint(p, piDocid);
  }else{
    fts3PoslistCopy(0, &p);
    if( p>=&aDoclist[nDoclist] ){
      *pbEof = 1;
    }else{
      sqlite3_int64 iVar;
      p += sqlite3Fts3GetVarint(p, &iVar);
      *piDocid += ((bDescIdx ? -1 : 1) * iVar);
    }
  }

  *ppIter = p;
}

/*
** Attempt to move the phrase iterator to point to the next matching docid. 
** If an error occurs, return an SQLite error code. Otherwise, return 
** SQLITE_OK.
**
** If there is no "next" entry and no error occurs, then *pbEof is set to
................................................................................
  int nToken = 0;
  int nOr = 0;

  /* Allocate a MultiSegReader for each token in the expression. */
  fts3EvalAllocateReaders(pCsr, pCsr->pExpr, &nToken, &nOr, &rc);

  /* Determine which, if any, tokens in the expression should be deferred. */
  if( rc==SQLITE_OK && nToken>1 && pTab->bFts4 ){
    Fts3TokenAndCost *aTC;
    Fts3Expr **apOr;
    aTC = (Fts3TokenAndCost *)sqlite3_malloc(
        sizeof(Fts3TokenAndCost) * nToken
      + sizeof(Fts3Expr *) * nOr * 2
    );
    apOr = (Fts3Expr **)&aTC[nToken];
................................................................................
** for 'X' is requested, the buffer returned may contain:
**
**     0x04 0x05 0x03 0x01   or   0x04 0x05 0x03 0x00
**
** This function works regardless of whether or not the phrase is deferred,
** incremental, or neither.
*/
SQLITE_PRIVATE int sqlite3Fts3EvalPhrasePoslist(
  Fts3Cursor *pCsr,               /* FTS3 cursor object */
  Fts3Expr *pExpr,                /* Phrase to return doclist for */
  int iCol,                       /* Column to return position list for */
  char **ppOut                    /* OUT: Pointer to position list */
){
  Fts3Phrase *pPhrase = pExpr->pPhrase;
  Fts3Table *pTab = (Fts3Table *)pCsr->base.pVtab;
  char *pIter;
  int iThis;
  sqlite3_int64 iDocid;

  /* If this phrase is applies specifically to some column other than 
  ** column iCol, return a NULL pointer.  */
  *ppOut = 0;
  assert( iCol>=0 && iCol<pTab->nColumn );



  if( (pPhrase->iColumn<pTab->nColumn && pPhrase->iColumn!=iCol) ){

    return SQLITE_OK;
  }

  iDocid = pExpr->iDocid;
  pIter = pPhrase->doclist.pList;
  if( iDocid!=pCsr->iPrevId || pExpr->bEof ){
    int bDescDoclist = pTab->bDescIdx;      /* For DOCID_CMP macro */
    int bOr = 0;
    u8 bEof = 0;
    Fts3Expr *p;

    /* Check if this phrase descends from an OR expression node. If not, 
    ** return NULL. Otherwise, the entry that corresponds to docid 
    ** pCsr->iPrevId may lie earlier in the doclist buffer. */
    for(p=pExpr->pParent; p; p=p->pParent){
      if( p->eType==FTSQUERY_OR ) bOr = 1;
    }
    if( bOr==0 ) return SQLITE_OK;

    /* This is the descendent of an OR node. In this case we cannot use
    ** an incremental phrase. Load the entire doclist for the phrase
    ** into memory in this case.  */
    if( pPhrase->bIncr ){
      int rc = SQLITE_OK;
      int bEofSave = pExpr->bEof;
      fts3EvalRestart(pCsr, pExpr, &rc);
      while( rc==SQLITE_OK && !pExpr->bEof ){
        fts3EvalNextRow(pCsr, pExpr, &rc);
        if( bEofSave==0 && pExpr->iDocid==iDocid ) break;
      }
      pIter = pPhrase->doclist.pList;
      assert( rc!=SQLITE_OK || pPhrase->bIncr==0 );
      if( rc!=SQLITE_OK ) return rc;
    }

    if( pExpr->bEof ){
      pIter = 0;
      iDocid = 0;
    }
    bEof = (pPhrase->doclist.nAll==0);
    assert( bDescDoclist==0 || bDescDoclist==1 );
    assert( pCsr->bDesc==0 || pCsr->bDesc==1 );

    if( pCsr->bDesc==bDescDoclist ){
      int dummy;
      while( (pIter==0 || DOCID_CMP(iDocid, pCsr->iPrevId)>0 ) && bEof==0 ){
        sqlite3Fts3DoclistPrev(
            bDescDoclist, pPhrase->doclist.aAll, pPhrase->doclist.nAll, 
            &pIter, &iDocid, &dummy, &bEof
        );
      }
    }else{
      while( (pIter==0 || DOCID_CMP(iDocid, pCsr->iPrevId)<0 ) && bEof==0 ){
        sqlite3Fts3DoclistNext(
            bDescDoclist, pPhrase->doclist.aAll, pPhrase->doclist.nAll, 
            &pIter, &iDocid, &bEof
        );
      }
    }

    if( bEof || iDocid!=pCsr->iPrevId ) pIter = 0;
  }
  if( pIter==0 ) return SQLITE_OK;

  if( *pIter==0x01 ){
    pIter++;
    pIter += sqlite3Fts3GetVarint32(pIter, &iThis);
  }else{
    iThis = 0;
  }
  while( iThis<iCol ){
    fts3ColumnlistCopy(0, &pIter);
    if( *pIter==0x00 ) return 0;
    pIter++;
    pIter += sqlite3Fts3GetVarint32(pIter, &iThis);
  }

  *ppOut = ((iCol==iThis)?pIter:0);
  return SQLITE_OK;
}

/*
** Free all components of the Fts3Phrase structure that were allocated by
** the eval module. Specifically, this means to free:
**
**   * the contents of pPhrase->doclist, and
................................................................................
    memset(&pPhrase->doclist, 0, sizeof(Fts3Doclist));
    for(i=0; i<pPhrase->nToken; i++){
      fts3SegReaderCursorFree(pPhrase->aToken[i].pSegcsr);
      pPhrase->aToken[i].pSegcsr = 0;
    }
  }
}


/*
** Return SQLITE_CORRUPT_VTAB.
*/
#ifdef SQLITE_DEBUG
SQLITE_PRIVATE int sqlite3Fts3Corrupt(){
  return SQLITE_CORRUPT_VTAB;
................................................................................

#if !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_FTS3)

/* #include <string.h> */
/* #include <assert.h> */
/* #include <stdlib.h> */


#define FTS_MAX_APPENDABLE_HEIGHT 16

/*
** When full-text index nodes are loaded from disk, the buffer that they
** are loaded into has the following number of bytes of padding at the end 
** of it. i.e. if a full-text index node is 900 bytes in size, then a buffer
** of 920 bytes is allocated for it.
**
** This means that if we have a pointer into a buffer containing node data,
................................................................................
int test_fts3_node_chunk_threshold = (4*1024)*4;
# define FTS3_NODE_CHUNKSIZE       test_fts3_node_chunksize
# define FTS3_NODE_CHUNK_THRESHOLD test_fts3_node_chunk_threshold
#else
# define FTS3_NODE_CHUNKSIZE (4*1024) 
# define FTS3_NODE_CHUNK_THRESHOLD (FTS3_NODE_CHUNKSIZE*4)
#endif

/*
** The two values that may be meaningfully bound to the :1 parameter in
** statements SQL_REPLACE_STAT and SQL_SELECT_STAT.
*/
#define FTS_STAT_DOCTOTAL      0
#define FTS_STAT_INCRMERGEHINT 1
#define FTS_STAT_AUTOINCRMERGE 2

/*
** If FTS_LOG_MERGES is defined, call sqlite3_log() to report each automatic
** and incremental merge operation that takes place. This is used for 
** debugging FTS only, it should not usually be turned on in production
** systems.
*/
#ifdef FTS3_LOG_MERGES
static void fts3LogMerge(int nMerge, sqlite3_int64 iAbsLevel){
  sqlite3_log(SQLITE_OK, "%d-way merge from level %d", nMerge, (int)iAbsLevel);
}
#else
#define fts3LogMerge(x, y)
#endif


typedef struct PendingList PendingList;
typedef struct SegmentNode SegmentNode;
typedef struct SegmentWriter SegmentWriter;

/*
** An instance of the following data structure is used to build doclists
................................................................................
#define SQL_SELECT_SEGDIR_MAX_LEVEL   15
#define SQL_DELETE_SEGDIR_LEVEL       16
#define SQL_DELETE_SEGMENTS_RANGE     17
#define SQL_CONTENT_INSERT            18
#define SQL_DELETE_DOCSIZE            19
#define SQL_REPLACE_DOCSIZE           20
#define SQL_SELECT_DOCSIZE            21
#define SQL_SELECT_STAT               22
#define SQL_REPLACE_STAT              23

#define SQL_SELECT_ALL_PREFIX_LEVEL   24
#define SQL_DELETE_ALL_TERMS_SEGDIR   25

#define SQL_DELETE_SEGDIR_RANGE       26

#define SQL_SELECT_ALL_LANGID         27
#define SQL_FIND_MERGE_LEVEL          28
#define SQL_MAX_LEAF_NODE_ESTIMATE    29
#define SQL_DELETE_SEGDIR_ENTRY       30
#define SQL_SHIFT_SEGDIR_ENTRY        31
#define SQL_SELECT_SEGDIR             32
#define SQL_CHOMP_SEGDIR              33
#define SQL_SEGMENT_IS_APPENDABLE     34
#define SQL_SELECT_INDEXES            35
#define SQL_SELECT_MXLEVEL            36

/*
** This function is used to obtain an SQLite prepared statement handle
** for the statement identified by the second argument. If successful,
** *pp is set to the requested statement handle and SQLITE_OK returned.
** Otherwise, an SQLite error code is returned and *pp is set to 0.
**
................................................................................
/* 2  */  "DELETE FROM %Q.'%q_content'",
/* 3  */  "DELETE FROM %Q.'%q_segments'",
/* 4  */  "DELETE FROM %Q.'%q_segdir'",
/* 5  */  "DELETE FROM %Q.'%q_docsize'",
/* 6  */  "DELETE FROM %Q.'%q_stat'",
/* 7  */  "SELECT %s WHERE rowid=?",
/* 8  */  "SELECT (SELECT max(idx) FROM %Q.'%q_segdir' WHERE level = ?) + 1",
/* 9  */  "REPLACE INTO %Q.'%q_segments'(blockid, block) VALUES(?, ?)",
/* 10 */  "SELECT coalesce((SELECT max(blockid) FROM %Q.'%q_segments') + 1, 1)",
/* 11 */  "REPLACE INTO %Q.'%q_segdir' VALUES(?,?,?,?,?,?)",

          /* Return segments in order from oldest to newest.*/ 
/* 12 */  "SELECT idx, start_block, leaves_end_block, end_block, root "
            "FROM %Q.'%q_segdir' WHERE level = ? ORDER BY idx ASC",
/* 13 */  "SELECT idx, start_block, leaves_end_block, end_block, root "
            "FROM %Q.'%q_segdir' WHERE level BETWEEN ? AND ?"
            "ORDER BY level DESC, idx ASC",
................................................................................

/* 16 */  "DELETE FROM %Q.'%q_segdir' WHERE level = ?",
/* 17 */  "DELETE FROM %Q.'%q_segments' WHERE blockid BETWEEN ? AND ?",
/* 18 */  "INSERT INTO %Q.'%q_content' VALUES(%s)",
/* 19 */  "DELETE FROM %Q.'%q_docsize' WHERE docid = ?",
/* 20 */  "REPLACE INTO %Q.'%q_docsize' VALUES(?,?)",
/* 21 */  "SELECT size FROM %Q.'%q_docsize' WHERE docid=?",
/* 22 */  "SELECT value FROM %Q.'%q_stat' WHERE id=?",
/* 23 */  "REPLACE INTO %Q.'%q_stat' VALUES(?,?)",
/* 24 */  "",
/* 25 */  "",

/* 26 */ "DELETE FROM %Q.'%q_segdir' WHERE level BETWEEN ? AND ?",
/* 27 */ "SELECT DISTINCT level / (1024 * ?) FROM %Q.'%q_segdir'",

/* This statement is used to determine which level to read the input from
** when performing an incremental merge. It returns the absolute level number
** of the oldest level in the db that contains at least ? segments. Or,
** if no level in the FTS index contains more than ? segments, the statement
** returns zero rows.  */
/* 28 */ "SELECT level FROM %Q.'%q_segdir' GROUP BY level HAVING count(*)>=?"
         "  ORDER BY (level %% 1024) ASC LIMIT 1",

/* Estimate the upper limit on the number of leaf nodes in a new segment
** created by merging the oldest :2 segments from absolute level :1. See 
** function sqlite3Fts3Incrmerge() for details.  */
/* 29 */ "SELECT 2 * total(1 + leaves_end_block - start_block) "
         "  FROM %Q.'%q_segdir' WHERE level = ? AND idx < ?",

/* SQL_DELETE_SEGDIR_ENTRY
**   Delete the %_segdir entry on absolute level :1 with index :2.  */
/* 30 */ "DELETE FROM %Q.'%q_segdir' WHERE level = ? AND idx = ?",

/* SQL_SHIFT_SEGDIR_ENTRY
**   Modify the idx value for the segment with idx=:3 on absolute level :2
**   to :1.  */
/* 31 */ "UPDATE %Q.'%q_segdir' SET idx = ? WHERE level=? AND idx=?",

/* SQL_SELECT_SEGDIR
**   Read a single entry from the %_segdir table. The entry from absolute 
**   level :1 with index value :2.  */
/* 32 */  "SELECT idx, start_block, leaves_end_block, end_block, root "
            "FROM %Q.'%q_segdir' WHERE level = ? AND idx = ?",

/* SQL_CHOMP_SEGDIR
**   Update the start_block (:1) and root (:2) fields of the %_segdir
**   entry located on absolute level :3 with index :4.  */
/* 33 */  "UPDATE %Q.'%q_segdir' SET start_block = ?, root = ?"
            "WHERE level = ? AND idx = ?",

/* SQL_SEGMENT_IS_APPENDABLE
**   Return a single row if the segment with end_block=? is appendable. Or
**   no rows otherwise.  */
/* 34 */  "SELECT 1 FROM %Q.'%q_segments' WHERE blockid=? AND block IS NULL",

/* SQL_SELECT_INDEXES
**   Return the list of valid segment indexes for absolute level ?  */
/* 35 */  "SELECT idx FROM %Q.'%q_segdir' WHERE level=? ORDER BY 1 ASC",

/* SQL_SELECT_MXLEVEL
**   Return the largest relative level in the FTS index or indexes.  */
/* 36 */  "SELECT max( level %% 1024 ) FROM %Q.'%q_segdir'"
  };
  int rc = SQLITE_OK;
  sqlite3_stmt *pStmt;

  assert( SizeofArray(azSql)==SizeofArray(p->aStmt) );
  assert( eStmt<SizeofArray(azSql) && eStmt>=0 );
  
................................................................................
    for(i=0; rc==SQLITE_OK && i<nParam; i++){
      rc = sqlite3_bind_value(pStmt, i+1, apVal[i]);
    }
  }
  *pp = pStmt;
  return rc;
}


static int fts3SelectDocsize(
  Fts3Table *pTab,                /* FTS3 table handle */

  sqlite3_int64 iDocid,           /* Docid to bind for SQL_SELECT_DOCSIZE */
  sqlite3_stmt **ppStmt           /* OUT: Statement handle */
){
  sqlite3_stmt *pStmt = 0;        /* Statement requested from fts3SqlStmt() */
  int rc;                         /* Return code */



  rc = fts3SqlStmt(pTab, SQL_SELECT_DOCSIZE, &pStmt, 0);
  if( rc==SQLITE_OK ){

    sqlite3_bind_int64(pStmt, 1, iDocid);

    rc = sqlite3_step(pStmt);
    if( rc!=SQLITE_ROW || sqlite3_column_type(pStmt, 0)!=SQLITE_BLOB ){
      rc = sqlite3_reset(pStmt);
      if( rc==SQLITE_OK ) rc = FTS_CORRUPT_VTAB;
      pStmt = 0;
    }else{
      rc = SQLITE_OK;
................................................................................
  return rc;
}

SQLITE_PRIVATE int sqlite3Fts3SelectDoctotal(
  Fts3Table *pTab,                /* Fts3 table handle */
  sqlite3_stmt **ppStmt           /* OUT: Statement handle */
){
  sqlite3_stmt *pStmt = 0;
  int rc;
  rc = fts3SqlStmt(pTab, SQL_SELECT_STAT, &pStmt, 0);
  if( rc==SQLITE_OK ){
    sqlite3_bind_int(pStmt, 1, FTS_STAT_DOCTOTAL);
    if( sqlite3_step(pStmt)!=SQLITE_ROW
     || sqlite3_column_type(pStmt, 0)!=SQLITE_BLOB
    ){
      rc = sqlite3_reset(pStmt);
      if( rc==SQLITE_OK ) rc = FTS_CORRUPT_VTAB;
      pStmt = 0;
    }
  }
  *ppStmt = pStmt;
  return rc;
}

SQLITE_PRIVATE int sqlite3Fts3SelectDocsize(
  Fts3Table *pTab,                /* Fts3 table handle */
  sqlite3_int64 iDocid,           /* Docid to read size data for */
  sqlite3_stmt **ppStmt           /* OUT: Statement handle */
){
  return fts3SelectDocsize(pTab, iDocid, ppStmt);
}

/*
** Similar to fts3SqlStmt(). Except, after binding the parameters in
** array apVal[] to the SQL statement identified by eStmt, the statement
** is executed.
**
................................................................................
** Language 1 indexes are allocated immediately following language 0.
**
** So, for a system with nPrefix prefix indexes configured, the block of
** absolute levels that corresponds to language-id iLangid and index 
** iIndex starts at absolute level ((iLangid * (nPrefix+1) + iIndex) * 1024).
*/
static sqlite3_int64 getAbsoluteLevel(
  Fts3Table *p,                   /* FTS3 table handle */
  int iLangid,                    /* Language id */
  int iIndex,                     /* Index in p->aIndex[] */
  int iLevel                      /* Level of segments */
){
  sqlite3_int64 iBase;            /* First absolute level for iLangid/iIndex */
  assert( iLangid>=0 );
  assert( p->nIndex>0 );
  assert( iIndex>=0 && iIndex<p->nIndex );

  iBase = ((sqlite3_int64)iLangid * p->nIndex + iIndex) * FTS3_SEGDIR_MAXLEVEL;
  return iBase + iLevel;
}


/*
** Set *ppStmt to a statement handle that may be used to iterate through
** all rows in the %_segdir table, from oldest to newest. If successful,
** return SQLITE_OK. If an error occurs while preparing the statement, 
** return an SQLite error code.
**
................................................................................
  if( rc==SQLITE_OK ){
    /* If iNext is FTS3_MERGE_COUNT, indicating that level iLevel is already
    ** full, merge all segments in level iLevel into a single iLevel+1
    ** segment and allocate (newly freed) index 0 at level iLevel. Otherwise,
    ** if iNext is less than FTS3_MERGE_COUNT, allocate index iNext.
    */
    if( iNext>=FTS3_MERGE_COUNT ){
      fts3LogMerge(16, getAbsoluteLevel(p, iLangid, iIndex, iLevel));
      rc = fts3SegmentMerge(p, iLangid, iIndex, iLevel);
      *piIdx = 0;
    }else{
      *piIdx = iNext;
    }
  }

................................................................................
  char **paBlob,                  /* OUT: Blob data in malloc'd buffer */
  int *pnBlob,                    /* OUT: Size of blob data */
  int *pnLoad                     /* OUT: Bytes actually loaded */
){
  int rc;                         /* Return code */

  /* pnBlob must be non-NULL. paBlob may be NULL or non-NULL. */
  assert( pnBlob );

  if( p->pSegments ){
    rc = sqlite3_blob_reopen(p->pSegments, iBlockid);
  }else{
    if( 0==p->zSegmentsTbl ){
      p->zSegmentsTbl = sqlite3_mprintf("%s_segments", p->zName);
      if( 0==p->zSegmentsTbl ) return SQLITE_NOMEM;
................................................................................
){
  Fts3Table *p = (Fts3Table*)pCsr->base.pVtab;
  int nOvfl = 0;
  int ii;
  int rc = SQLITE_OK;
  int pgsz = p->nPgsz;

  assert( p->bFts4 );
  assert( pgsz>0 );

  for(ii=0; rc==SQLITE_OK && ii<pMsr->nSegment; ii++){
    Fts3SegReader *pReader = pMsr->apSegment[ii];
    if( !fts3SegReaderIsPending(pReader) 
     && !fts3SegReaderIsRootOnly(pReader) 
    ){
................................................................................
    sqlite3_bind_int64(pStmt, 1, iBlock);
    sqlite3_bind_blob(pStmt, 2, z, n, SQLITE_STATIC);
    sqlite3_step(pStmt);
    rc = sqlite3_reset(pStmt);
  }
  return rc;
}

/*
** Find the largest relative level number in the table. If successful, set
** *pnMax to this value and return SQLITE_OK. Otherwise, if an error occurs,
** set *pnMax to zero and return an SQLite error code.
*/
SQLITE_PRIVATE int sqlite3Fts3MaxLevel(Fts3Table *p, int *pnMax){
  int rc;
  int mxLevel = 0;
  sqlite3_stmt *pStmt = 0;

  rc = fts3SqlStmt(p, SQL_SELECT_MXLEVEL, &pStmt, 0);
  if( rc==SQLITE_OK ){
    if( SQLITE_ROW==sqlite3_step(pStmt) ){
      mxLevel = sqlite3_column_int(pStmt, 0);
    }
    rc = sqlite3_reset(pStmt);
  }
  *pnMax = mxLevel;
  return rc;
}

/* 
** Insert a record into the %_segdir table.
*/
static int fts3WriteSegdir(
  Fts3Table *p,                   /* Virtual table handle */
  sqlite3_int64 iLevel,           /* Value for "level" field (absolute level) */
................................................................................

  if( nData>0 && nData+nReq>p->nNodeSize ){
    int rc;

    /* The current leaf node is full. Write it out to the database. */
    rc = fts3WriteSegment(p, pWriter->iFree++, pWriter->aData, nData);
    if( rc!=SQLITE_OK ) return rc;
    p->nLeafAdd++;

    /* Add the current term to the interior node tree. The term added to
    ** the interior tree must:
    **
    **   a) be greater than the largest term on the leaf node just written
    **      to the database (still available in pWriter->zTerm), and
    **
................................................................................
          p, iLevel, iIdx, pWriter->iFirst, iLastLeaf, iLast, zRoot, nRoot);
    }
  }else{
    /* The entire tree fits on the root node. Write it to the segdir table. */
    rc = fts3WriteSegdir(
        p, iLevel, iIdx, 0, 0, 0, pWriter->aData, pWriter->nData);
  }
  p->nLeafAdd++;
  return rc;
}

/*
** Release all memory held by the SegmentWriter object passed as the 
** first argument.
*/
................................................................................
      getAbsoluteLevel(p, iLangid, iIndex, FTS3_SEGDIR_MAXLEVEL-1)
  );
  if( SQLITE_ROW==sqlite3_step(pStmt) ){
    *pnMax = sqlite3_column_int64(pStmt, 0);
  }
  return sqlite3_reset(pStmt);
}

/*
** Delete all entries in the %_segments table associated with the segment
** opened with seg-reader pSeg. This function does not affect the contents
** of the %_segdir table.
*/
static int fts3DeleteSegment(
  Fts3Table *p,                   /* FTS table handle */
  Fts3SegReader *pSeg             /* Segment to delete */
){
  int rc = SQLITE_OK;             /* Return code */
  if( pSeg->iStartBlock ){
    sqlite3_stmt *pDelete;        /* SQL statement to delete rows */
    rc = fts3SqlStmt(p, SQL_DELETE_SEGMENTS_RANGE, &pDelete, 0);
    if( rc==SQLITE_OK ){
      sqlite3_bind_int64(pDelete, 1, pSeg->iStartBlock);
      sqlite3_bind_int64(pDelete, 2, pSeg->iEndBlock);
      sqlite3_step(pDelete);
      rc = sqlite3_reset(pDelete);
    }
  }
  return rc;
}

/*
** This function is used after merging multiple segments into a single large
** segment to delete the old, now redundant, segment b-trees. Specifically,
** it:
** 
**   1) Deletes all %_segments entries for the segments associated with 
................................................................................
  Fts3Table *p,                   /* Virtual table handle */
  int iLangid,                    /* Language id */
  int iIndex,                     /* Index for p->aIndex */
  int iLevel,                     /* Level of %_segdir entries to delete */
  Fts3SegReader **apSegment,      /* Array of SegReader objects */
  int nReader                     /* Size of array apSegment */
){
  int rc = SQLITE_OK;             /* Return Code */
  int i;                          /* Iterator variable */
  sqlite3_stmt *pDelete = 0;      /* SQL statement to delete rows */


  for(i=0; rc==SQLITE_OK && i<nReader; i++){







    rc = fts3DeleteSegment(p, apSegment[i]);
  }
  if( rc!=SQLITE_OK ){
    return rc;
  }

  assert( iLevel>=0 || iLevel==FTS3_SEGCURSOR_ALL );
  if( iLevel==FTS3_SEGCURSOR_ALL ){
................................................................................

/* 
** Flush the contents of pendingTerms to level 0 segments.
*/
SQLITE_PRIVATE int sqlite3Fts3PendingTermsFlush(Fts3Table *p){
  int rc = SQLITE_OK;
  int i;
        
  for(i=0; rc==SQLITE_OK && i<p->nIndex; i++){
    rc = fts3SegmentMerge(p, p->iPrevLangid, i, FTS3_SEGCURSOR_PENDING);
    if( rc==SQLITE_DONE ) rc = SQLITE_OK;
  }
  sqlite3Fts3PendingTermsClear(p);

  /* Determine the auto-incr-merge setting if unknown.  If enabled,
  ** estimate the number of leaf blocks of content to be written
  */
  if( rc==SQLITE_OK && p->bHasStat
   && p->bAutoincrmerge==0xff && p->nLeafAdd>0
  ){
    sqlite3_stmt *pStmt = 0;
    rc = fts3SqlStmt(p, SQL_SELECT_STAT, &pStmt, 0);
    if( rc==SQLITE_OK ){
      sqlite3_bind_int(pStmt, 1, FTS_STAT_AUTOINCRMERGE);
      rc = sqlite3_step(pStmt);
      p->bAutoincrmerge = (rc==SQLITE_ROW && sqlite3_column_int(pStmt, 0));
      rc = sqlite3_reset(pStmt);
    }
  }
  return rc;
}

/*
** Encode N integers as varints into a blob.
*/
static void fts3EncodeIntArray(
................................................................................
  if( *pRC ) return;
  a = sqlite3_malloc( (sizeof(u32)+10)*nStat );
  if( a==0 ){
    *pRC = SQLITE_NOMEM;
    return;
  }
  pBlob = (char*)&a[nStat];
  rc = fts3SqlStmt(p, SQL_SELECT_STAT, &pStmt, 0);
  if( rc ){
    sqlite3_free(a);
    *pRC = rc;
    return;
  }
  sqlite3_bind_int(pStmt, 1, FTS_STAT_DOCTOTAL);
  if( sqlite3_step(pStmt)==SQLITE_ROW ){
    fts3DecodeIntArray(nStat, a,
         sqlite3_column_blob(pStmt, 0),
         sqlite3_column_bytes(pStmt, 0));
  }else{
    memset(a, 0, sizeof(u32)*(nStat) );
  }
................................................................................
      x = 0;
    }else{
      x = x + aSzIns[i] - aSzDel[i];
    }
    a[i+1] = x;
  }
  fts3EncodeIntArray(nStat, a, pBlob, &nBlob);
  rc = fts3SqlStmt(p, SQL_REPLACE_STAT, &pStmt, 0);
  if( rc ){
    sqlite3_free(a);
    *pRC = rc;
    return;
  }
  sqlite3_bind_int(pStmt, 1, FTS_STAT_DOCTOTAL);
  sqlite3_bind_blob(pStmt, 2, pBlob, nBlob, SQLITE_STATIC);
  sqlite3_step(pStmt);
  *pRC = sqlite3_reset(pStmt);
  sqlite3_free(a);
}

/*
** Merge the entire database so that there is one segment for each 
................................................................................
      }else{
        nEntry++;
        for(iCol=0; iCol<=p->nColumn; iCol++){
          aSzIns[iCol] += aSz[iCol];
        }
      }
    }
    if( p->bFts4 ){
      fts3UpdateDocTotals(&rc, p, aSzIns, aSzDel, nEntry);
    }
    sqlite3_free(aSz);

    if( pStmt ){
      int rc2 = sqlite3_finalize(pStmt);
      if( rc==SQLITE_OK ){
................................................................................
      }
    }
  }

  return rc;
}


/*
** This function opens a cursor used to read the input data for an 
** incremental merge operation. Specifically, it opens a cursor to scan
** the oldest nSeg segments (idx=0 through idx=(nSeg-1)) in absolute 
** level iAbsLevel.
*/
static int fts3IncrmergeCsr(
  Fts3Table *p,                   /* FTS3 table handle */
  sqlite3_int64 iAbsLevel,        /* Absolute level to open */
  int nSeg,                       /* Number of segments to merge */
  Fts3MultiSegReader *pCsr        /* Cursor object to populate */
){
  int rc;                         /* Return Code */
  sqlite3_stmt *pStmt = 0;        /* Statement used to read %_segdir entry */  
  int nByte;                      /* Bytes allocated at pCsr->apSegment[] */

  /* Allocate space for the Fts3MultiSegReader.aCsr[] array */
  memset(pCsr, 0, sizeof(*pCsr));
  nByte = sizeof(Fts3SegReader *) * nSeg;
  pCsr->apSegment = (Fts3SegReader **)sqlite3_malloc(nByte);

  if( pCsr->apSegment==0 ){
    rc = SQLITE_NOMEM;
  }else{
    memset(pCsr->apSegment, 0, nByte);
    rc = fts3SqlStmt(p, SQL_SELECT_LEVEL, &pStmt, 0);
  }
  if( rc==SQLITE_OK ){
    int i;
    int rc2;
    sqlite3_bind_int64(pStmt, 1, iAbsLevel);
    assert( pCsr->nSegment==0 );
    for(i=0; rc==SQLITE_OK && sqlite3_step(pStmt)==SQLITE_ROW && i<nSeg; i++){
      rc = sqlite3Fts3SegReaderNew(i, 0,
          sqlite3_column_int64(pStmt, 1),        /* segdir.start_block */
          sqlite3_column_int64(pStmt, 2),        /* segdir.leaves_end_block */
          sqlite3_column_int64(pStmt, 3),        /* segdir.end_block */
          sqlite3_column_blob(pStmt, 4),         /* segdir.root */
          sqlite3_column_bytes(pStmt, 4),        /* segdir.root */
          &pCsr->apSegment[i]
      );
      pCsr->nSegment++;
    }
    rc2 = sqlite3_reset(pStmt);
    if( rc==SQLITE_OK ) rc = rc2;
  }

  return rc;
}

typedef struct IncrmergeWriter IncrmergeWriter;
typedef struct NodeWriter NodeWriter;
typedef struct Blob Blob;
typedef struct NodeReader NodeReader;

/*
** An instance of the following structure is used as a dynamic buffer
** to build up nodes or other blobs of data in.
**
** The function blobGrowBuffer() is used to extend the allocation.
*/
struct Blob {
  char *a;                        /* Pointer to allocation */
  int n;                          /* Number of valid bytes of data in a[] */
  int nAlloc;                     /* Allocated size of a[] (nAlloc>=n) */
};

/*
** This structure is used to build up buffers containing segment b-tree 
** nodes (blocks).
*/
struct NodeWriter {
  sqlite3_int64 iBlock;           /* Current block id */
  Blob key;                       /* Last key written to the current block */
  Blob block;                     /* Current block image */
};

/*
** An object of this type contains the state required to create or append
** to an appendable b-tree segment.
*/
struct IncrmergeWriter {
  int nLeafEst;                   /* Space allocated for leaf blocks */
  int nWork;                      /* Number of leaf pages flushed */
  sqlite3_int64 iAbsLevel;        /* Absolute level of input segments */
  int iIdx;                       /* Index of *output* segment in iAbsLevel+1 */
  sqlite3_int64 iStart;           /* Block number of first allocated block */
  sqlite3_int64 iEnd;             /* Block number of last allocated block */
  NodeWriter aNodeWriter[FTS_MAX_APPENDABLE_HEIGHT];
};

/*
** An object of the following type is used to read data from a single
** FTS segment node. See the following functions:
**
**     nodeReaderInit()
**     nodeReaderNext()
**     nodeReaderRelease()
*/
struct NodeReader {
  const char *aNode;
  int nNode;
  int iOff;                       /* Current offset within aNode[] */

  /* Output variables. Containing the current node entry. */
  sqlite3_int64 iChild;           /* Pointer to child node */
  Blob term;                      /* Current term */
  const char *aDoclist;           /* Pointer to doclist */
  int nDoclist;                   /* Size of doclist in bytes */
};

/*
** If *pRc is not SQLITE_OK when this function is called, it is a no-op.
** Otherwise, if the allocation at pBlob->a is not already at least nMin
** bytes in size, extend (realloc) it to be so.
**
** If an OOM error occurs, set *pRc to SQLITE_NOMEM and leave pBlob->a
** unmodified. Otherwise, if the allocation succeeds, update pBlob->nAlloc
** to reflect the new size of the pBlob->a[] buffer.
*/
static void blobGrowBuffer(Blob *pBlob, int nMin, int *pRc){
  if( *pRc==SQLITE_OK && nMin>pBlob->nAlloc ){
    int nAlloc = nMin;
    char *a = (char *)sqlite3_realloc(pBlob->a, nAlloc);
    if( a ){
      pBlob->nAlloc = nAlloc;
      pBlob->a = a;
    }else{
      *pRc = SQLITE_NOMEM;
    }
  }
}

/*
** Attempt to advance the node-reader object passed as the first argument to
** the next entry on the node. 
**
** Return an error code if an error occurs (SQLITE_NOMEM is possible). 
** Otherwise return SQLITE_OK. If there is no next entry on the node
** (e.g. because the current entry is the last) set NodeReader->aNode to
** NULL to indicate EOF. Otherwise, populate the NodeReader structure output 
** variables for the new entry.
*/
static int nodeReaderNext(NodeReader *p){
  int bFirst = (p->term.n==0);    /* True for first term on the node */
  int nPrefix = 0;                /* Bytes to copy from previous term */
  int nSuffix = 0;                /* Bytes to append to the prefix */
  int rc = SQLITE_OK;             /* Return code */

  assert( p->aNode );
  if( p->iChild && bFirst==0 ) p->iChild++;
  if( p->iOff>=p->nNode ){
    /* EOF */
    p->aNode = 0;
  }else{
    if( bFirst==0 ){
      p->iOff += sqlite3Fts3GetVarint32(&p->aNode[p->iOff], &nPrefix);
    }
    p->iOff += sqlite3Fts3GetVarint32(&p->aNode[p->iOff], &nSuffix);

    blobGrowBuffer(&p->term, nPrefix+nSuffix, &rc);
    if( rc==SQLITE_OK ){
      memcpy(&p->term.a[nPrefix], &p->aNode[p->iOff], nSuffix);
      p->term.n = nPrefix+nSuffix;
      p->iOff += nSuffix;
      if( p->iChild==0 ){
        p->iOff += sqlite3Fts3GetVarint32(&p->aNode[p->iOff], &p->nDoclist);
        p->aDoclist = &p->aNode[p->iOff];
        p->iOff += p->nDoclist;
      }
    }
  }

  assert( p->iOff<=p->nNode );

  return rc;
}

/*
** Release all dynamic resources held by node-reader object *p.
*/
static void nodeReaderRelease(NodeReader *p){
  sqlite3_free(p->term.a);
}

/*
** Initialize a node-reader object to read the node in buffer aNode/nNode.
**
** If successful, SQLITE_OK is returned and the NodeReader object set to 
** point to the first entry on the node (if any). Otherwise, an SQLite
** error code is returned.
*/
static int nodeReaderInit(NodeReader *p, const char *aNode, int nNode){
  memset(p, 0, sizeof(NodeReader));
  p->aNode = aNode;
  p->nNode = nNode;

  /* Figure out if this is a leaf or an internal node. */
  if( p->aNode[0] ){
    /* An internal node. */
    p->iOff = 1 + sqlite3Fts3GetVarint(&p->aNode[1], &p->iChild);
  }else{
    p->iOff = 1;
  }

  return nodeReaderNext(p);
}

/*
** This function is called while writing an FTS segment each time a leaf o
** node is finished and written to disk. The key (zTerm/nTerm) is guaranteed
** to be greater than the largest key on the node just written, but smaller
** than or equal to the first key that will be written to the next leaf
** node.
**
** The block id of the leaf node just written to disk may be found in
** (pWriter->aNodeWriter[0].iBlock) when this function is called.
*/
static int fts3IncrmergePush(
  Fts3Table *p,                   /* Fts3 table handle */
  IncrmergeWriter *pWriter,       /* Writer object */
  const char *zTerm,              /* Term to write to internal node */
  int nTerm                       /* Bytes at zTerm */
){
  sqlite3_int64 iPtr = pWriter->aNodeWriter[0].iBlock;
  int iLayer;

  assert( nTerm>0 );
  for(iLayer=1; ALWAYS(iLayer<FTS_MAX_APPENDABLE_HEIGHT); iLayer++){
    sqlite3_int64 iNextPtr = 0;
    NodeWriter *pNode = &pWriter->aNodeWriter[iLayer];
    int rc = SQLITE_OK;
    int nPrefix;
    int nSuffix;
    int nSpace;

    /* Figure out how much space the key will consume if it is written to
    ** the current node of layer iLayer. Due to the prefix compression, 
    ** the space required changes depending on which node the key is to
    ** be added to.  */
    nPrefix = fts3PrefixCompress(pNode->key.a, pNode->key.n, zTerm, nTerm);
    nSuffix = nTerm - nPrefix;
    nSpace  = sqlite3Fts3VarintLen(nPrefix);
    nSpace += sqlite3Fts3VarintLen(nSuffix) + nSuffix;

    if( pNode->key.n==0 || (pNode->block.n + nSpace)<=p->nNodeSize ){ 
      /* If the current node of layer iLayer contains zero keys, or if adding
      ** the key to it will not cause it to grow to larger than nNodeSize 
      ** bytes in size, write the key here.  */

      Blob *pBlk = &pNode->block;
      if( pBlk->n==0 ){
        blobGrowBuffer(pBlk, p->nNodeSize, &rc);
        if( rc==SQLITE_OK ){
          pBlk->a[0] = (char)iLayer;
          pBlk->n = 1 + sqlite3Fts3PutVarint(&pBlk->a[1], iPtr);
        }
      }
      blobGrowBuffer(pBlk, pBlk->n + nSpace, &rc);
      blobGrowBuffer(&pNode->key, nTerm, &rc);

      if( rc==SQLITE_OK ){
        if( pNode->key.n ){
          pBlk->n += sqlite3Fts3PutVarint(&pBlk->a[pBlk->n], nPrefix);
        }
        pBlk->n += sqlite3Fts3PutVarint(&pBlk->a[pBlk->n], nSuffix);
        memcpy(&pBlk->a[pBlk->n], &zTerm[nPrefix], nSuffix);
        pBlk->n += nSuffix;

        memcpy(pNode->key.a, zTerm, nTerm);
        pNode->key.n = nTerm;
      }
    }else{
      /* Otherwise, flush the the current node of layer iLayer to disk.
      ** Then allocate a new, empty sibling node. The key will be written
      ** into the parent of this node. */
      rc = fts3WriteSegment(p, pNode->iBlock, pNode->block.a, pNode->block.n);

      assert( pNode->block.nAlloc>=p->nNodeSize );
      pNode->block.a[0] = (char)iLayer;
      pNode->block.n = 1 + sqlite3Fts3PutVarint(&pNode->block.a[1], iPtr+1);

      iNextPtr = pNode->iBlock;
      pNode->iBlock++;
      pNode->key.n = 0;
    }

    if( rc!=SQLITE_OK || iNextPtr==0 ) return rc;
    iPtr = iNextPtr;
  }

  assert( 0 );
  return 0;
}

/*
** Append a term and (optionally) doclist to the FTS segment node currently
** stored in blob *pNode. The node need not contain any terms, but the
** header must be written before this function is called.
**
** A node header is a single 0x00 byte for a leaf node, or a height varint
** followed by the left-hand-child varint for an internal node.
**
** The term to be appended is passed via arguments zTerm/nTerm. For a 
** leaf node, the doclist is passed as aDoclist/nDoclist. For an internal
** node, both aDoclist and nDoclist must be passed 0.
**
** If the size of the value in blob pPrev is zero, then this is the first
** term written to the node. Otherwise, pPrev contains a copy of the 
** previous term. Before this function returns, it is updated to contain a
** copy of zTerm/nTerm.
**
** It is assumed that the buffer associated with pNode is already large
** enough to accommodate the new entry. The buffer associated with pPrev
** is extended by this function if requrired.
**
** If an error (i.e. OOM condition) occurs, an SQLite error code is
** returned. Otherwise, SQLITE_OK.
*/
static int fts3AppendToNode(
  Blob *pNode,                    /* Current node image to append to */
  Blob *pPrev,                    /* Buffer containing previous term written */
  const char *zTerm,              /* New term to write */
  int nTerm,                      /* Size of zTerm in bytes */
  const char *aDoclist,           /* Doclist (or NULL) to write */
  int nDoclist                    /* Size of aDoclist in bytes */ 
){
  int rc = SQLITE_OK;             /* Return code */
  int bFirst = (pPrev->n==0);     /* True if this is the first term written */
  int nPrefix;                    /* Size of term prefix in bytes */
  int nSuffix;                    /* Size of term suffix in bytes */

  /* Node must have already been started. There must be a doclist for a
  ** leaf node, and there must not be a doclist for an internal node.  */
  assert( pNode->n>0 );
  assert( (pNode->a[0]=='\0')==(aDoclist!=0) );

  blobGrowBuffer(pPrev, nTerm, &rc);
  if( rc!=SQLITE_OK ) return rc;

  nPrefix = fts3PrefixCompress(pPrev->a, pPrev->n, zTerm, nTerm);
  nSuffix = nTerm - nPrefix;
  memcpy(pPrev->a, zTerm, nTerm);
  pPrev->n = nTerm;

  if( bFirst==0 ){
    pNode->n += sqlite3Fts3PutVarint(&pNode->a[pNode->n], nPrefix);
  }
  pNode->n += sqlite3Fts3PutVarint(&pNode->a[pNode->n], nSuffix);
  memcpy(&pNode->a[pNode->n], &zTerm[nPrefix], nSuffix);
  pNode->n += nSuffix;

  if( aDoclist ){
    pNode->n += sqlite3Fts3PutVarint(&pNode->a[pNode->n], nDoclist);
    memcpy(&pNode->a[pNode->n], aDoclist, nDoclist);
    pNode->n += nDoclist;
  }

  assert( pNode->n<=pNode->nAlloc );

  return SQLITE_OK;
}

/*
** Append the current term and doclist pointed to by cursor pCsr to the
** appendable b-tree segment opened for writing by pWriter.
**
** Return SQLITE_OK if successful, or an SQLite error code otherwise.
*/
static int fts3IncrmergeAppend(
  Fts3Table *p,                   /* Fts3 table handle */
  IncrmergeWriter *pWriter,       /* Writer object */
  Fts3MultiSegReader *pCsr        /* Cursor containing term and doclist */
){
  const char *zTerm = pCsr->zTerm;
  int nTerm = pCsr->nTerm;
  const char *aDoclist = pCsr->aDoclist;
  int nDoclist = pCsr->nDoclist;
  int rc = SQLITE_OK;           /* Return code */
  int nSpace;                   /* Total space in bytes required on leaf */
  int nPrefix;                  /* Size of prefix shared with previous term */
  int nSuffix;                  /* Size of suffix (nTerm - nPrefix) */
  NodeWriter *pLeaf;            /* Object used to write leaf nodes */

  pLeaf = &pWriter->aNodeWriter[0];
  nPrefix = fts3PrefixCompress(pLeaf->key.a, pLeaf->key.n, zTerm, nTerm);
  nSuffix = nTerm - nPrefix;

  nSpace  = sqlite3Fts3VarintLen(nPrefix);
  nSpace += sqlite3Fts3VarintLen(nSuffix) + nSuffix;
  nSpace += sqlite3Fts3VarintLen(nDoclist) + nDoclist;

  /* If the current block is not empty, and if adding this term/doclist
  ** to the current block would make it larger than Fts3Table.nNodeSize
  ** bytes, write this block out to the database. */
  if( pLeaf->block.n>0 && (pLeaf->block.n + nSpace)>p->nNodeSize ){
    rc = fts3WriteSegment(p, pLeaf->iBlock, pLeaf->block.a, pLeaf->block.n);
    pWriter->nWork++;

    /* Add the current term to the parent node. The term added to the 
    ** parent must:
    **
    **   a) be greater than the largest term on the leaf node just written
    **      to the database (still available in pLeaf->key), and
    **
    **   b) be less than or equal to the term about to be added to the new
    **      leaf node (zTerm/nTerm).
    **
    ** In other words, it must be the prefix of zTerm 1 byte longer than
    ** the common prefix (if any) of zTerm and pWriter->zTerm.
    */
    if( rc==SQLITE_OK ){
      rc = fts3IncrmergePush(p, pWriter, zTerm, nPrefix+1);
    }

    /* Advance to the next output block */
    pLeaf->iBlock++;
    pLeaf->key.n = 0;
    pLeaf->block.n = 0;

    nSuffix = nTerm;
    nSpace  = 1;
    nSpace += sqlite3Fts3VarintLen(nSuffix) + nSuffix;
    nSpace += sqlite3Fts3VarintLen(nDoclist) + nDoclist;
  }

  blobGrowBuffer(&pLeaf->block, pLeaf->block.n + nSpace, &rc);

  if( rc==SQLITE_OK ){
    if( pLeaf->block.n==0 ){
      pLeaf->block.n = 1;
      pLeaf->block.a[0] = '\0';
    }
    rc = fts3AppendToNode(
        &pLeaf->block, &pLeaf->key, zTerm, nTerm, aDoclist, nDoclist
    );
  }

  return rc;
}

/*
** This function is called to release all dynamic resources held by the
** merge-writer object pWriter, and if no error has occurred, to flush
** all outstanding node buffers held by pWriter to disk.
**
** If *pRc is not SQLITE_OK when this function is called, then no attempt
** is made to write any data to disk. Instead, this function serves only
** to release outstanding resources.
**
** Otherwise, if *pRc is initially SQLITE_OK and an error occurs while
** flushing buffers to disk, *pRc is set to an SQLite error code before
** returning.
*/
static void fts3IncrmergeRelease(
  Fts3Table *p,                   /* FTS3 table handle */
  IncrmergeWriter *pWriter,       /* Merge-writer object */
  int *pRc                        /* IN/OUT: Error code */
){
  int i;                          /* Used to iterate through non-root layers */
  int iRoot;                      /* Index of root in pWriter->aNodeWriter */
  NodeWriter *pRoot;              /* NodeWriter for root node */
  int rc = *pRc;                  /* Error code */

  /* Set iRoot to the index in pWriter->aNodeWriter[] of the output segment 
  ** root node. If the segment fits entirely on a single leaf node, iRoot
  ** will be set to 0. If the root node is the parent of the leaves, iRoot
  ** will be 1. And so on.  */
  for(iRoot=FTS_MAX_APPENDABLE_HEIGHT-1; iRoot>=0; iRoot--){
    NodeWriter *pNode = &pWriter->aNodeWriter[iRoot];
    if( pNode->block.n>0 ) break;
    assert( *pRc || pNode->block.nAlloc==0 );
    assert( *pRc || pNode->key.nAlloc==0 );
    sqlite3_free(pNode->block.a);
    sqlite3_free(pNode->key.a);
  }

  /* Empty output segment. This is a no-op. */
  if( iRoot<0 ) return;

  /* The entire output segment fits on a single node. Normally, this means
  ** the node would be stored as a blob in the "root" column of the %_segdir
  ** table. However, this is not permitted in this case. The problem is that 
  ** space has already been reserved in the %_segments table, and so the 
  ** start_block and end_block fields of the %_segdir table must be populated. 
  ** And, by design or by accident, released versions of FTS cannot handle 
  ** segments that fit entirely on the root node with start_block!=0.
  **
  ** Instead, create a synthetic root node that contains nothing but a 
  ** pointer to the single content node. So that the segment consists of a
  ** single leaf and a single interior (root) node.
  **
  ** Todo: Better might be to defer allocating space in the %_segments 
  ** table until we are sure it is needed.
  */
  if( iRoot==0 ){
    Blob *pBlock = &pWriter->aNodeWriter[1].block;
    blobGrowBuffer(pBlock, 1 + FTS3_VARINT_MAX, &rc);
    if( rc==SQLITE_OK ){
      pBlock->a[0] = 0x01;
      pBlock->n = 1 + sqlite3Fts3PutVarint(
          &pBlock->a[1], pWriter->aNodeWriter[0].iBlock
      );
    }
    iRoot = 1;
  }
  pRoot = &pWriter->aNodeWriter[iRoot];

  /* Flush all currently outstanding nodes to disk. */
  for(i=0; i<iRoot; i++){
    NodeWriter *pNode = &pWriter->aNodeWriter[i];
    if( pNode->block.n>0 && rc==SQLITE_OK ){
      rc = fts3WriteSegment(p, pNode->iBlock, pNode->block.a, pNode->block.n);
    }
    sqlite3_free(pNode->block.a);
    sqlite3_free(pNode->key.a);
  }

  /* Write the %_segdir record. */
  if( rc==SQLITE_OK ){
    rc = fts3WriteSegdir(p, 
        pWriter->iAbsLevel+1,               /* level */
        pWriter->iIdx,                      /* idx */
        pWriter->iStart,                    /* start_block */
        pWriter->aNodeWriter[0].iBlock,     /* leaves_end_block */
        pWriter->iEnd,                      /* end_block */
        pRoot->block.a, pRoot->block.n      /* root */
    );
  }
  sqlite3_free(pRoot->block.a);
  sqlite3_free(pRoot->key.a);

  *pRc = rc;
}

/*
** Compare the term in buffer zLhs (size in bytes nLhs) with that in
** zRhs (size in bytes nRhs) using memcmp. If one term is a prefix of
** the other, it is considered to be smaller than the other.
**
** Return -ve if zLhs is smaller than zRhs, 0 if it is equal, or +ve
** if it is greater.
*/
static int fts3TermCmp(
  const char *zLhs, int nLhs,     /* LHS of comparison */
  const char *zRhs, int nRhs      /* RHS of comparison */
){
  int nCmp = MIN(nLhs, nRhs);
  int res;

  res = memcmp(zLhs, zRhs, nCmp);
  if( res==0 ) res = nLhs - nRhs;

  return res;
}


/*
** Query to see if the entry in the %_segments table with blockid iEnd is 
** NULL. If no error occurs and the entry is NULL, set *pbRes 1 before
** returning. Otherwise, set *pbRes to 0. 
**
** Or, if an error occurs while querying the database, return an SQLite 
** error code. The final value of *pbRes is undefined in this case.
**
** This is used to test if a segment is an "appendable" segment. If it
** is, then a NULL entry has been inserted into the %_segments table
** with blockid %_segdir.end_block.
*/
static int fts3IsAppendable(Fts3Table *p, sqlite3_int64 iEnd, int *pbRes){
  int bRes = 0;                   /* Result to set *pbRes to */
  sqlite3_stmt *pCheck = 0;       /* Statement to query database with */
  int rc;                         /* Return code */

  rc = fts3SqlStmt(p, SQL_SEGMENT_IS_APPENDABLE, &pCheck, 0);
  if( rc==SQLITE_OK ){
    sqlite3_bind_int64(pCheck, 1, iEnd);
    if( SQLITE_ROW==sqlite3_step(pCheck) ) bRes = 1;
    rc = sqlite3_reset(pCheck);
  }
  
  *pbRes = bRes;
  return rc;
}

/*
** This function is called when initializing an incremental-merge operation.
** It checks if the existing segment with index value iIdx at absolute level 
** (iAbsLevel+1) can be appended to by the incremental merge. If it can, the
** merge-writer object *pWriter is initialized to write to it.
**
** An existing segment can be appended to by an incremental merge if:
**
**   * It was initially created as an appendable segment (with all required
**     space pre-allocated), and
**
**   * The first key read from the input (arguments zKey and nKey) is 
**     greater than the largest key currently stored in the potential
**     output segment.
*/
static int fts3IncrmergeLoad(
  Fts3Table *p,                   /* Fts3 table handle */
  sqlite3_int64 iAbsLevel,        /* Absolute level of input segments */
  int iIdx,                       /* Index of candidate output segment */
  const char *zKey,               /* First key to write */
  int nKey,                       /* Number of bytes in nKey */
  IncrmergeWriter *pWriter        /* Populate this object */
){
  int rc;                         /* Return code */
  sqlite3_stmt *pSelect = 0;      /* SELECT to read %_segdir entry */

  rc = fts3SqlStmt(p, SQL_SELECT_SEGDIR, &pSelect, 0);
  if( rc==SQLITE_OK ){
    sqlite3_int64 iStart = 0;     /* Value of %_segdir.start_block */
    sqlite3_int64 iLeafEnd = 0;   /* Value of %_segdir.leaves_end_block */
    sqlite3_int64 iEnd = 0;       /* Value of %_segdir.end_block */
    const char *aRoot = 0;        /* Pointer to %_segdir.root buffer */
    int nRoot = 0;                /* Size of aRoot[] in bytes */
    int rc2;                      /* Return code from sqlite3_reset() */
    int bAppendable = 0;          /* Set to true if segment is appendable */

    /* Read the %_segdir entry for index iIdx absolute level (iAbsLevel+1) */
    sqlite3_bind_int64(pSelect, 1, iAbsLevel+1);
    sqlite3_bind_int(pSelect, 2, iIdx);
    if( sqlite3_step(pSelect)==SQLITE_ROW ){
      iStart = sqlite3_column_int64(pSelect, 1);
      iLeafEnd = sqlite3_column_int64(pSelect, 2);
      iEnd = sqlite3_column_int64(pSelect, 3);
      nRoot = sqlite3_column_bytes(pSelect, 4);
      aRoot = sqlite3_column_blob(pSelect, 4);
    }else{
      return sqlite3_reset(pSelect);
    }

    /* Check for the zero-length marker in the %_segments table */
    rc = fts3IsAppendable(p, iEnd, &bAppendable);

    /* Check that zKey/nKey is larger than the largest key the candidate */
    if( rc==SQLITE_OK && bAppendable ){
      char *aLeaf = 0;
      int nLeaf = 0;

      rc = sqlite3Fts3ReadBlock(p, iLeafEnd, &aLeaf, &nLeaf, 0);
      if( rc==SQLITE_OK ){
        NodeReader reader;
        for(rc = nodeReaderInit(&reader, aLeaf, nLeaf);
            rc==SQLITE_OK && reader.aNode;
            rc = nodeReaderNext(&reader)
        ){
          assert( reader.aNode );
        }
        if( fts3TermCmp(zKey, nKey, reader.term.a, reader.term.n)<=0 ){
          bAppendable = 0;
        }
        nodeReaderRelease(&reader);
      }
      sqlite3_free(aLeaf);
    }

    if( rc==SQLITE_OK && bAppendable ){
      /* It is possible to append to this segment. Set up the IncrmergeWriter
      ** object to do so.  */
      int i;
      int nHeight = (int)aRoot[0];
      NodeWriter *pNode;

      pWriter->nLeafEst = (int)((iEnd - iStart) + 1)/FTS_MAX_APPENDABLE_HEIGHT;
      pWriter->iStart = iStart;
      pWriter->iEnd = iEnd;
      pWriter->iAbsLevel = iAbsLevel;
      pWriter->iIdx = iIdx;

      for(i=nHeight+1; i<FTS_MAX_APPENDABLE_HEIGHT; i++){
        pWriter->aNodeWriter[i].iBlock = pWriter->iStart + i*pWriter->nLeafEst;
      }

      pNode = &pWriter->aNodeWriter[nHeight];
      pNode->iBlock = pWriter->iStart + pWriter->nLeafEst*nHeight;
      blobGrowBuffer(&pNode->block, MAX(nRoot, p->nNodeSize), &rc);
      if( rc==SQLITE_OK ){
        memcpy(pNode->block.a, aRoot, nRoot);
        pNode->block.n = nRoot;
      }

      for(i=nHeight; i>=0 && rc==SQLITE_OK; i--){
        NodeReader reader;
        pNode = &pWriter->aNodeWriter[i];

        rc = nodeReaderInit(&reader, pNode->block.a, pNode->block.n);
        while( reader.aNode && rc==SQLITE_OK ) rc = nodeReaderNext(&reader);
        blobGrowBuffer(&pNode->key, reader.term.n, &rc);
        if( rc==SQLITE_OK ){
          memcpy(pNode->key.a, reader.term.a, reader.term.n);
          pNode->key.n = reader.term.n;
          if( i>0 ){
            char *aBlock = 0;
            int nBlock = 0;
            pNode = &pWriter->aNodeWriter[i-1];
            pNode->iBlock = reader.iChild;
            rc = sqlite3Fts3ReadBlock(p, reader.iChild, &aBlock, &nBlock, 0);
            blobGrowBuffer(&pNode->block, MAX(nBlock, p->nNodeSize), &rc);
            if( rc==SQLITE_OK ){
              memcpy(pNode->block.a, aBlock, nBlock);
              pNode->block.n = nBlock;
            }
            sqlite3_free(aBlock);
          }
        }
        nodeReaderRelease(&reader);
      }
    }

    rc2 = sqlite3_reset(pSelect);
    if( rc==SQLITE_OK ) rc = rc2;
  }

  return rc;
}

/*
** Determine the largest segment index value that exists within absolute
** level iAbsLevel+1. If no error occurs, set *piIdx to this value plus
** one before returning SQLITE_OK. Or, if there are no segments at all 
** within level iAbsLevel, set *piIdx to zero.
**
** If an error occurs, return an SQLite error code. The final value of
** *piIdx is undefined in this case.
*/
static int fts3IncrmergeOutputIdx( 
  Fts3Table *p,                   /* FTS Table handle */
  sqlite3_int64 iAbsLevel,        /* Absolute index of input segments */
  int *piIdx                      /* OUT: Next free index at iAbsLevel+1 */
){
  int rc;
  sqlite3_stmt *pOutputIdx = 0;   /* SQL used to find output index */

  rc = fts3SqlStmt(p, SQL_NEXT_SEGMENT_INDEX, &pOutputIdx, 0);
  if( rc==SQLITE_OK ){
    sqlite3_bind_int64(pOutputIdx, 1, iAbsLevel+1);
    sqlite3_step(pOutputIdx);
    *piIdx = sqlite3_column_int(pOutputIdx, 0);
    rc = sqlite3_reset(pOutputIdx);
  }

  return rc;
}

/* 
** Allocate an appendable output segment on absolute level iAbsLevel+1
** with idx value iIdx.
**
** In the %_segdir table, a segment is defined by the values in three
** columns:
**
**     start_block
**     leaves_end_block
**     end_block
**
** When an appendable segment is allocated, it is estimated that the
** maximum number of leaf blocks that may be required is the sum of the
** number of leaf blocks consumed by the input segments, plus the number
** of input segments, multiplied by two. This value is stored in stack 
** variable nLeafEst.
**
** A total of 16*nLeafEst blocks are allocated when an appendable segment
** is created ((1 + end_block - start_block)==16*nLeafEst). The contiguous
** array of leaf nodes starts at the first block allocated. The array
** of interior nodes that are parents of the leaf nodes start at block
** (start_block + (1 + end_block - start_block) / 16). And so on.
**
** In the actual code below, the value "16" is replaced with the 
** pre-processor macro FTS_MAX_APPENDABLE_HEIGHT.
*/
static int fts3IncrmergeWriter( 
  Fts3Table *p,                   /* Fts3 table handle */
  sqlite3_int64 iAbsLevel,        /* Absolute level of input segments */
  int iIdx,                       /* Index of new output segment */
  Fts3MultiSegReader *pCsr,       /* Cursor that data will be read from */
  IncrmergeWriter *pWriter        /* Populate this object */
){
  int rc;                         /* Return Code */
  int i;                          /* Iterator variable */
  int nLeafEst = 0;               /* Blocks allocated for leaf nodes */
  sqlite3_stmt *pLeafEst = 0;     /* SQL used to determine nLeafEst */
  sqlite3_stmt *pFirstBlock = 0;  /* SQL used to determine first block */

  /* Calculate nLeafEst. */
  rc = fts3SqlStmt(p, SQL_MAX_LEAF_NODE_ESTIMATE, &pLeafEst, 0);
  if( rc==SQLITE_OK ){
    sqlite3_bind_int64(pLeafEst, 1, iAbsLevel);
    sqlite3_bind_int64(pLeafEst, 2, pCsr->nSegment);
    if( SQLITE_ROW==sqlite3_step(pLeafEst) ){
      nLeafEst = sqlite3_column_int(pLeafEst, 0);
    }
    rc = sqlite3_reset(pLeafEst);
  }
  if( rc!=SQLITE_OK ) return rc;

  /* Calculate the first block to use in the output segment */
  rc = fts3SqlStmt(p, SQL_NEXT_SEGMENTS_ID, &pFirstBlock, 0);
  if( rc==SQLITE_OK ){
    if( SQLITE_ROW==sqlite3_step(pFirstBlock) ){
      pWriter->iStart = sqlite3_column_int64(pFirstBlock, 0);
      pWriter->iEnd = pWriter->iStart - 1;
      pWriter->iEnd += nLeafEst * FTS_MAX_APPENDABLE_HEIGHT;
    }
    rc = sqlite3_reset(pFirstBlock);
  }
  if( rc!=SQLITE_OK ) return rc;

  /* Insert the marker in the %_segments table to make sure nobody tries
  ** to steal the space just allocated. This is also used to identify 
  ** appendable segments.  */
  rc = fts3WriteSegment(p, pWriter->iEnd, 0, 0);
  if( rc!=SQLITE_OK ) return rc;

  pWriter->iAbsLevel = iAbsLevel;
  pWriter->nLeafEst = nLeafEst;
  pWriter->iIdx = iIdx;

  /* Set up the array of NodeWriter objects */
  for(i=0; i<FTS_MAX_APPENDABLE_HEIGHT; i++){
    pWriter->aNodeWriter[i].iBlock = pWriter->iStart + i*pWriter->nLeafEst;
  }
  return SQLITE_OK;
}

/*
** Remove an entry from the %_segdir table. This involves running the 
** following two statements:
**
**   DELETE FROM %_segdir WHERE level = :iAbsLevel AND idx = :iIdx
**   UPDATE %_segdir SET idx = idx - 1 WHERE level = :iAbsLevel AND idx > :iIdx
**
** The DELETE statement removes the specific %_segdir level. The UPDATE 
** statement ensures that the remaining segments have contiguously allocated
** idx values.
*/
static int fts3RemoveSegdirEntry(
  Fts3Table *p,                   /* FTS3 table handle */
  sqlite3_int64 iAbsLevel,        /* Absolute level to delete from */
  int iIdx                        /* Index of %_segdir entry to delete */
){
  int rc;                         /* Return code */
  sqlite3_stmt *pDelete = 0;      /* DELETE statement */

  rc = fts3SqlStmt(p, SQL_DELETE_SEGDIR_ENTRY, &pDelete, 0);
  if( rc==SQLITE_OK ){
    sqlite3_bind_int64(pDelete, 1, iAbsLevel);
    sqlite3_bind_int(pDelete, 2, iIdx);
    sqlite3_step(pDelete);
    rc = sqlite3_reset(pDelete);
  }

  return rc;
}

/*
** One or more segments have just been removed from absolute level iAbsLevel.
** Update the 'idx' values of the remaining segments in the level so that
** the idx values are a contiguous sequence starting from 0.
*/
static int fts3RepackSegdirLevel(
  Fts3Table *p,                   /* FTS3 table handle */
  sqlite3_int64 iAbsLevel         /* Absolute level to repack */
){
  int rc;                         /* Return code */
  int *aIdx = 0;                  /* Array of remaining idx values */
  int nIdx = 0;                   /* Valid entries in aIdx[] */
  int nAlloc = 0;                 /* Allocated size of aIdx[] */
  int i;                          /* Iterator variable */
  sqlite3_stmt *pSelect = 0;      /* Select statement to read idx values */
  sqlite3_stmt *pUpdate = 0;      /* Update statement to modify idx values */

  rc = fts3SqlStmt(p, SQL_SELECT_INDEXES, &pSelect, 0);
  if( rc==SQLITE_OK ){
    int rc2;
    sqlite3_bind_int64(pSelect, 1, iAbsLevel);
    while( SQLITE_ROW==sqlite3_step(pSelect) ){
      if( nIdx>=nAlloc ){
        int *aNew;
        nAlloc += 16;
        aNew = sqlite3_realloc(aIdx, nAlloc*sizeof(int));
        if( !aNew ){
          rc = SQLITE_NOMEM;
          break;
        }
        aIdx = aNew;
      }
      aIdx[nIdx++] = sqlite3_column_int(pSelect, 0);
    }
    rc2 = sqlite3_reset(pSelect);
    if( rc==SQLITE_OK ) rc = rc2;
  }

  if( rc==SQLITE_OK ){
    rc = fts3SqlStmt(p, SQL_SHIFT_SEGDIR_ENTRY, &pUpdate, 0);
  }
  if( rc==SQLITE_OK ){
    sqlite3_bind_int64(pUpdate, 2, iAbsLevel);
  }

  assert( p->bIgnoreSavepoint==0 );
  p->bIgnoreSavepoint = 1;
  for(i=0; rc==SQLITE_OK && i<nIdx; i++){
    if( aIdx[i]!=i ){
      sqlite3_bind_int(pUpdate, 3, aIdx[i]);
      sqlite3_bind_int(pUpdate, 1, i);
      sqlite3_step(pUpdate);
      rc = sqlite3_reset(pUpdate);
    }
  }
  p->bIgnoreSavepoint = 0;

  sqlite3_free(aIdx);
  return rc;
}

static void fts3StartNode(Blob *pNode, int iHeight, sqlite3_int64 iChild){
  pNode->a[0] = (char)iHeight;
  if( iChild ){
    assert( pNode->nAlloc>=1+sqlite3Fts3VarintLen(iChild) );
    pNode->n = 1 + sqlite3Fts3PutVarint(&pNode->a[1], iChild);
  }else{
    assert( pNode->nAlloc>=1 );
    pNode->n = 1;
  }
}

/*
** The first two arguments are a pointer to and the size of a segment b-tree
** node. The node may be a leaf or an internal node.
**
** This function creates a new node image in blob object *pNew by copying
** all terms that are greater than or equal to zTerm/nTerm (for leaf nodes)
** or greater than zTerm/nTerm (for internal nodes) from aNode/nNode.
*/
static int fts3TruncateNode(
  const char *aNode,              /* Current node image */
  int nNode,                      /* Size of aNode in bytes */
  Blob *pNew,                     /* OUT: Write new node image here */
  const char *zTerm,              /* Omit all terms smaller than this */
  int nTerm,                      /* Size of zTerm in bytes */
  sqlite3_int64 *piBlock          /* OUT: Block number in next layer down */
){
  NodeReader reader;              /* Reader object */
  Blob prev = {0, 0, 0};          /* Previous term written to new node */
  int rc = SQLITE_OK;             /* Return code */
  int bLeaf = aNode[0]=='\0';     /* True for a leaf node */

  /* Allocate required output space */
  blobGrowBuffer(pNew, nNode, &rc);
  if( rc!=SQLITE_OK ) return rc;
  pNew->n = 0;

  /* Populate new node buffer */
  for(rc = nodeReaderInit(&reader, aNode, nNode); 
      rc==SQLITE_OK && reader.aNode; 
      rc = nodeReaderNext(&reader)
  ){
    if( pNew->n==0 ){
      int res = fts3TermCmp(reader.term.a, reader.term.n, zTerm, nTerm);
      if( res<0 || (bLeaf==0 && res==0) ) continue;
      fts3StartNode(pNew, (int)aNode[0], reader.iChild);
      *piBlock = reader.iChild;
    }
    rc = fts3AppendToNode(
        pNew, &prev, reader.term.a, reader.term.n,
        reader.aDoclist, reader.nDoclist
    );
    if( rc!=SQLITE_OK ) break;
  }
  if( pNew->n==0 ){
    fts3StartNode(pNew, (int)aNode[0], reader.iChild);
    *piBlock = reader.iChild;
  }
  assert( pNew->n<=pNew->nAlloc );

  nodeReaderRelease(&reader);
  sqlite3_free(prev.a);
  return rc;
}

/*
** Remove all terms smaller than zTerm/nTerm from segment iIdx in absolute 
** level iAbsLevel. This may involve deleting entries from the %_segments
** table, and modifying existing entries in both the %_segments and %_segdir
** tables.
**
** SQLITE_OK is returned if the segment is updated successfully. Or an
** SQLite error code otherwise.
*/
static int fts3TruncateSegment(
  Fts3Table *p,                   /* FTS3 table handle */
  sqlite3_int64 iAbsLevel,        /* Absolute level of segment to modify */
  int iIdx,                       /* Index within level of segment to modify */
  const char *zTerm,              /* Remove terms smaller than this */
  int nTerm                      /* Number of bytes in buffer zTerm */
){
  int rc = SQLITE_OK;             /* Return code */
  Blob root = {0,0,0};            /* New root page image */
  Blob block = {0,0,0};           /* Buffer used for any other block */
  sqlite3_int64 iBlock = 0;       /* Block id */
  sqlite3_int64 iNewStart = 0;    /* New value for iStartBlock */
  sqlite3_int64 iOldStart = 0;    /* Old value for iStartBlock */
  sqlite3_stmt *pFetch = 0;       /* Statement used to fetch segdir */

  rc = fts3SqlStmt(p, SQL_SELECT_SEGDIR, &pFetch, 0);
  if( rc==SQLITE_OK ){
    int rc2;                      /* sqlite3_reset() return code */
    sqlite3_bind_int64(pFetch, 1, iAbsLevel);
    sqlite3_bind_int(pFetch, 2, iIdx);
    if( SQLITE_ROW==sqlite3_step(pFetch) ){
      const char *aRoot = sqlite3_column_blob(pFetch, 4);
      int nRoot = sqlite3_column_bytes(pFetch, 4);
      iOldStart = sqlite3_column_int64(pFetch, 1);
      rc = fts3TruncateNode(aRoot, nRoot, &root, zTerm, nTerm, &iBlock);
    }
    rc2 = sqlite3_reset(pFetch);
    if( rc==SQLITE_OK ) rc = rc2;
  }

  while( rc==SQLITE_OK && iBlock ){
    char *aBlock = 0;
    int nBlock = 0;
    iNewStart = iBlock;

    rc = sqlite3Fts3ReadBlock(p, iBlock, &aBlock, &nBlock, 0);
    if( rc==SQLITE_OK ){
      rc = fts3TruncateNode(aBlock, nBlock, &block, zTerm, nTerm, &iBlock);
    }
    if( rc==SQLITE_OK ){
      rc = fts3WriteSegment(p, iNewStart, block.a, block.n);
    }
    sqlite3_free(aBlock);
  }

  /* Variable iNewStart now contains the first valid leaf node. */
  if( rc==SQLITE_OK && iNewStart ){
    sqlite3_stmt *pDel = 0;
    rc = fts3SqlStmt(p, SQL_DELETE_SEGMENTS_RANGE, &pDel, 0);
    if( rc==SQLITE_OK ){
      sqlite3_bind_int64(pDel, 1, iOldStart);
      sqlite3_bind_int64(pDel, 2, iNewStart-1);
      sqlite3_step(pDel);
      rc = sqlite3_reset(pDel);
    }
  }

  if( rc==SQLITE_OK ){
    sqlite3_stmt *pChomp = 0;
    rc = fts3SqlStmt(p, SQL_CHOMP_SEGDIR, &pChomp, 0);
    if( rc==SQLITE_OK ){
      sqlite3_bind_int64(pChomp, 1, iNewStart);
      sqlite3_bind_blob(pChomp, 2, root.a, root.n, SQLITE_STATIC);
      sqlite3_bind_int64(pChomp, 3, iAbsLevel);
      sqlite3_bind_int(pChomp, 4, iIdx);
      sqlite3_step(pChomp);
      rc = sqlite3_reset(pChomp);
    }
  }

  sqlite3_free(root.a);
  sqlite3_free(block.a);
  return rc;
}

/*
** This function is called after an incrmental-merge operation has run to
** merge (or partially merge) two or more segments from absolute level
** iAbsLevel.
**
** Each input segment is either removed from the db completely (if all of
** its data was copied to the output segment by the incrmerge operation)
** or modified in place so that it no longer contains those entries that
** have been duplicated in the output segment.
*/
static int fts3IncrmergeChomp(
  Fts3Table *p,                   /* FTS table handle */
  sqlite3_int64 iAbsLevel,        /* Absolute level containing segments */
  Fts3MultiSegReader *pCsr,       /* Chomp all segments opened by this cursor */
  int *pnRem                      /* Number of segments not deleted */
){
  int i;
  int nRem = 0;
  int rc = SQLITE_OK;

  for(i=pCsr->nSegment-1; i>=0 && rc==SQLITE_OK; i--){
    Fts3SegReader *pSeg = 0;
    int j;

    /* Find the Fts3SegReader object with Fts3SegReader.iIdx==i. It is hiding
    ** somewhere in the pCsr->apSegment[] array.  */
    for(j=0; ALWAYS(j<pCsr->nSegment); j++){
      pSeg = pCsr->apSegment[j];
      if( pSeg->iIdx==i ) break;
    }
    assert( j<pCsr->nSegment && pSeg->iIdx==i );

    if( pSeg->aNode==0 ){
      /* Seg-reader is at EOF. Remove the entire input segment. */
      rc = fts3DeleteSegment(p, pSeg);
      if( rc==SQLITE_OK ){
        rc = fts3RemoveSegdirEntry(p, iAbsLevel, pSeg->iIdx);
      }
      *pnRem = 0;
    }else{
      /* The incremental merge did not copy all the data from this 
      ** segment to the upper level. The segment is modified in place
      ** so that it contains no keys smaller than zTerm/nTerm. */ 
      const char *zTerm = pSeg->zTerm;
      int nTerm = pSeg->nTerm;
      rc = fts3TruncateSegment(p, iAbsLevel, pSeg->iIdx, zTerm, nTerm);
      nRem++;
    }
  }

  if( rc==SQLITE_OK && nRem!=pCsr->nSegment ){
    rc = fts3RepackSegdirLevel(p, iAbsLevel);
  }

  *pnRem = nRem;
  return rc;
}

/*
** Store an incr-merge hint in the database.
*/
static int fts3IncrmergeHintStore(Fts3Table *p, Blob *pHint){
  sqlite3_stmt *pReplace = 0;
  int rc;                         /* Return code */

  rc = fts3SqlStmt(p, SQL_REPLACE_STAT, &pReplace, 0);
  if( rc==SQLITE_OK ){
    sqlite3_bind_int(pReplace, 1, FTS_STAT_INCRMERGEHINT);
    sqlite3_bind_blob(pReplace, 2, pHint->a, pHint->n, SQLITE_STATIC);
    sqlite3_step(pReplace);
    rc = sqlite3_reset(pReplace);
  }

  return rc;
}

/*
** Load an incr-merge hint from the database. The incr-merge hint, if one 
** exists, is stored in the rowid==1 row of the %_stat table.
**
** If successful, populate blob *pHint with the value read from the %_stat
** table and return SQLITE_OK. Otherwise, if an error occurs, return an
** SQLite error code.
*/
static int fts3IncrmergeHintLoad(Fts3Table *p, Blob *pHint){
  sqlite3_stmt *pSelect = 0;
  int rc;

  pHint->n = 0;
  rc = fts3SqlStmt(p, SQL_SELECT_STAT, &pSelect, 0);
  if( rc==SQLITE_OK ){
    int rc2;
    sqlite3_bind_int(pSelect, 1, FTS_STAT_INCRMERGEHINT);
    if( SQLITE_ROW==sqlite3_step(pSelect) ){
      const char *aHint = sqlite3_column_blob(pSelect, 0);
      int nHint = sqlite3_column_bytes(pSelect, 0);
      if( aHint ){
        blobGrowBuffer(pHint, nHint, &rc);
        if( rc==SQLITE_OK ){
          memcpy(pHint->a, aHint, nHint);
          pHint->n = nHint;
        }
      }
    }
    rc2 = sqlite3_reset(pSelect);
    if( rc==SQLITE_OK ) rc = rc2;
  }

  return rc;
}

/*
** If *pRc is not SQLITE_OK when this function is called, it is a no-op.
** Otherwise, append an entry to the hint stored in blob *pHint. Each entry
** consists of two varints, the absolute level number of the input segments 
** and the number of input segments.
**
** If successful, leave *pRc set to SQLITE_OK and return. If an error occurs,
** set *pRc to an SQLite error code before returning.
*/
static void fts3IncrmergeHintPush(
  Blob *pHint,                    /* Hint blob to append to */
  i64 iAbsLevel,                  /* First varint to store in hint */
  int nInput,                     /* Second varint to store in hint */
  int *pRc                        /* IN/OUT: Error code */
){
  blobGrowBuffer(pHint, pHint->n + 2*FTS3_VARINT_MAX, pRc);
  if( *pRc==SQLITE_OK ){
    pHint->n += sqlite3Fts3PutVarint(&pHint->a[pHint->n], iAbsLevel);
    pHint->n += sqlite3Fts3PutVarint(&pHint->a[pHint->n], (i64)nInput);
  }
}

/*
** Read the last entry (most recently pushed) from the hint blob *pHint
** and then remove the entry. Write the two values read to *piAbsLevel and 
** *pnInput before returning.
**
** If no error occurs, return SQLITE_OK. If the hint blob in *pHint does
** not contain at least two valid varints, return SQLITE_CORRUPT_VTAB.
*/
static int fts3IncrmergeHintPop(Blob *pHint, i64 *piAbsLevel, int *pnInput){
  const int nHint = pHint->n;
  int i;

  i = pHint->n-2;
  while( i>0 && (pHint->a[i-1] & 0x80) ) i--;
  while( i>0 && (pHint->a[i-1] & 0x80) ) i--;

  pHint->n = i;
  i += sqlite3Fts3GetVarint(&pHint->a[i], piAbsLevel);
  i += sqlite3Fts3GetVarint32(&pHint->a[i], pnInput);
  if( i!=nHint ) return SQLITE_CORRUPT_VTAB;

  return SQLITE_OK;
}


/*
** Attempt an incremental merge that writes nMerge leaf blocks.
**
** Incremental merges happen nMin segments at a time. The two
** segments to be merged are the nMin oldest segments (the ones with
** the smallest indexes) in the highest level that contains at least
** nMin segments. Multiple merges might occur in an attempt to write the 
** quota of nMerge leaf blocks.
*/
SQLITE_PRIVATE int sqlite3Fts3Incrmerge(Fts3Table *p, int nMerge, int nMin){
  int rc;                         /* Return code */
  int nRem = nMerge;              /* Number of leaf pages yet to  be written */
  Fts3MultiSegReader *pCsr;       /* Cursor used to read input data */
  Fts3SegFilter *pFilter;         /* Filter used with cursor pCsr */
  IncrmergeWriter *pWriter;       /* Writer object */
  int nSeg = 0;                   /* Number of input segments */
  sqlite3_int64 iAbsLevel = 0;    /* Absolute level number to work on */
  Blob hint = {0, 0, 0};          /* Hint read from %_stat table */
  int bDirtyHint = 0;             /* True if blob 'hint' has been modified */

  /* Allocate space for the cursor, filter and writer objects */
  const int nAlloc = sizeof(*pCsr) + sizeof(*pFilter) + sizeof(*pWriter);
  pWriter = (IncrmergeWriter *)sqlite3_malloc(nAlloc);
  if( !pWriter ) return SQLITE_NOMEM;
  pFilter = (Fts3SegFilter *)&pWriter[1];
  pCsr = (Fts3MultiSegReader *)&pFilter[1];

  rc = fts3IncrmergeHintLoad(p, &hint);
  while( rc==SQLITE_OK && nRem>0 ){
    const i64 nMod = FTS3_SEGDIR_MAXLEVEL * p->nIndex;
    sqlite3_stmt *pFindLevel = 0; /* SQL used to determine iAbsLevel */
    int bUseHint = 0;             /* True if attempting to append */

    /* Search the %_segdir table for the absolute level with the smallest
    ** relative level number that contains at least nMin segments, if any.
    ** If one is found, set iAbsLevel to the absolute level number and
    ** nSeg to nMin. If no level with at least nMin segments can be found, 
    ** set nSeg to -1.
    */
    rc = fts3SqlStmt(p, SQL_FIND_MERGE_LEVEL, &pFindLevel, 0);
    sqlite3_bind_int(pFindLevel, 1, nMin);
    if( sqlite3_step(pFindLevel)==SQLITE_ROW ){
      iAbsLevel = sqlite3_column_int64(pFindLevel, 0);
      nSeg = nMin;
    }else{
      nSeg = -1;
    }
    rc = sqlite3_reset(pFindLevel);

    /* If the hint read from the %_stat table is not empty, check if the
    ** last entry in it specifies a relative level smaller than or equal
    ** to the level identified by the block above (if any). If so, this 
    ** iteration of the loop will work on merging at the hinted level.
    */
    if( rc==SQLITE_OK && hint.n ){
      int nHint = hint.n;
      sqlite3_int64 iHintAbsLevel = 0;      /* Hint level */
      int nHintSeg = 0;                     /* Hint number of segments */

      rc = fts3IncrmergeHintPop(&hint, &iHintAbsLevel, &nHintSeg);
      if( nSeg<0 || (iAbsLevel % nMod) >= (iHintAbsLevel % nMod) ){
        iAbsLevel = iHintAbsLevel;
        nSeg = nHintSeg;
        bUseHint = 1;
        bDirtyHint = 1;
      }else{
        /* This undoes the effect of the HintPop() above - so that no entry
        ** is removed from the hint blob.  */
        hint.n = nHint;
      }
    }

    /* If nSeg is less that zero, then there is no level with at least
    ** nMin segments and no hint in the %_stat table. No work to do.
    ** Exit early in this case.  */
    if( nSeg<0 ) break;

    /* Open a cursor to iterate through the contents of the oldest nSeg 
    ** indexes of absolute level iAbsLevel. If this cursor is opened using 
    ** the 'hint' parameters, it is possible that there are less than nSeg
    ** segments available in level iAbsLevel. In this case, no work is
    ** done on iAbsLevel - fall through to the next iteration of the loop 
    ** to start work on some other level.  */
    memset(pWriter, 0, nAlloc);
    pFilter->flags = FTS3_SEGMENT_REQUIRE_POS;
    if( rc==SQLITE_OK ){
      rc = fts3IncrmergeCsr(p, iAbsLevel, nSeg, pCsr);
    }
    if( SQLITE_OK==rc && pCsr->nSegment==nSeg
     && SQLITE_OK==(rc = sqlite3Fts3SegReaderStart(p, pCsr, pFilter))
     && SQLITE_ROW==(rc = sqlite3Fts3SegReaderStep(p, pCsr))
    ){
      int iIdx = 0;               /* Largest idx in level (iAbsLevel+1) */
      rc = fts3IncrmergeOutputIdx(p, iAbsLevel, &iIdx);
      if( rc==SQLITE_OK ){
        if( bUseHint && iIdx>0 ){
          const char *zKey = pCsr->zTerm;
          int nKey = pCsr->nTerm;
          rc = fts3IncrmergeLoad(p, iAbsLevel, iIdx-1, zKey, nKey, pWriter);
        }else{
          rc = fts3IncrmergeWriter(p, iAbsLevel, iIdx, pCsr, pWriter);
        }
      }

      if( rc==SQLITE_OK && pWriter->nLeafEst ){
        fts3LogMerge(nSeg, iAbsLevel);
        do {
          rc = fts3IncrmergeAppend(p, pWriter, pCsr);
          if( rc==SQLITE_OK ) rc = sqlite3Fts3SegReaderStep(p, pCsr);
          if( pWriter->nWork>=nRem && rc==SQLITE_ROW ) rc = SQLITE_OK;
        }while( rc==SQLITE_ROW );

        /* Update or delete the input segments */
        if( rc==SQLITE_OK ){
          nRem -= (1 + pWriter->nWork);
          rc = fts3IncrmergeChomp(p, iAbsLevel, pCsr, &nSeg);
          if( nSeg!=0 ){
            bDirtyHint = 1;
            fts3IncrmergeHintPush(&hint, iAbsLevel, nSeg, &rc);
          }
        }
      }

      fts3IncrmergeRelease(p, pWriter, &rc);
    }

    sqlite3Fts3SegReaderFinish(pCsr);
  }

  /* Write the hint values into the %_stat table for the next incr-merger */
  if( bDirtyHint && rc==SQLITE_OK ){
    rc = fts3IncrmergeHintStore(p, &hint);
  }

  sqlite3_free(pWriter);
  sqlite3_free(hint.a);
  return rc;
}

/*
** Convert the text beginning at *pz into an integer and return
** its value.  Advance *pz to point to the first character past
** the integer.
*/
static int fts3Getint(const char **pz){
  const char *z = *pz;
  int i = 0;
  while( (*z)>='0' && (*z)<='9' ) i = 10*i + *(z++) - '0';
  *pz = z;
  return i;
}

/*
** Process statements of the form:
**
**    INSERT INTO table(table) VALUES('merge=A,B');
**
** A and B are integers that decode to be the number of leaf pages
** written for the merge, and the minimum number of segments on a level
** before it will be selected for a merge, respectively.
*/
static int fts3DoIncrmerge(
  Fts3Table *p,                   /* FTS3 table handle */
  const char *zParam              /* Nul-terminated string containing "A,B" */
){
  int rc;
  int nMin = (FTS3_MERGE_COUNT / 2);
  int nMerge = 0;
  const char *z = zParam;

  /* Read the first integer value */
  nMerge = fts3Getint(&z);

  /* If the first integer value is followed by a ',',  read the second
  ** integer value. */
  if( z[0]==',' && z[1]!='\0' ){
    z++;
    nMin = fts3Getint(&z);
  }

  if( z[0]!='\0' || nMin<2 ){
    rc = SQLITE_ERROR;
  }else{
    rc = SQLITE_OK;
    if( !p->bHasStat ){
      assert( p->bFts4==0 );
      sqlite3Fts3CreateStatTable(&rc, p);
    }
    if( rc==SQLITE_OK ){
      rc = sqlite3Fts3Incrmerge(p, nMerge, nMin);
    }
    sqlite3Fts3SegmentsClose(p);
  }
  return rc;
}

/*
** Process statements of the form:
**
**    INSERT INTO table(table) VALUES('automerge=X');
**
** where X is an integer.  X==0 means to turn automerge off.  X!=0 means
** turn it on.  The setting is persistent.
*/
static int fts3DoAutoincrmerge(
  Fts3Table *p,                   /* FTS3 table handle */
  const char *zParam              /* Nul-terminated string containing boolean */
){
  int rc = SQLITE_OK;
  sqlite3_stmt *pStmt = 0;
  p->bAutoincrmerge = fts3Getint(&zParam)!=0;
  if( !p->bHasStat ){
    assert( p->bFts4==0 );
    sqlite3Fts3CreateStatTable(&rc, p);
    if( rc ) return rc;
  }
  rc = fts3SqlStmt(p, SQL_REPLACE_STAT, &pStmt, 0);
  if( rc ) return rc;;
  sqlite3_bind_int(pStmt, 1, FTS_STAT_AUTOINCRMERGE);
  sqlite3_bind_int(pStmt, 2, p->bAutoincrmerge);
  sqlite3_step(pStmt);
  rc = sqlite3_reset(pStmt);
  return rc;
}

/*
** Return a 64-bit checksum for the FTS index entry specified by the
** arguments to this function.
*/
static u64 fts3ChecksumEntry(
  const char *zTerm,              /* Pointer to buffer containing term */
  int nTerm,                      /* Size of zTerm in bytes */
  int iLangid,                    /* Language id for current row */
  int iIndex,                     /* Index (0..Fts3Table.nIndex-1) */
  i64 iDocid,                     /* Docid for current row. */
  int iCol,                       /* Column number */
  int iPos                        /* Position */
){
  int i;
  u64 ret = (u64)iDocid;

  ret += (ret<<3) + iLangid;
  ret += (ret<<3) + iIndex;
  ret += (ret<<3) + iCol;
  ret += (ret<<3) + iPos;
  for(i=0; i<nTerm; i++) ret += (ret<<3) + zTerm[i];

  return ret;
}

/*
** Return a checksum of all entries in the FTS index that correspond to
** language id iLangid. The checksum is calculated by XORing the checksums
** of each individual entry (see fts3ChecksumEntry()) together.
**
** If successful, the checksum value is returned and *pRc set to SQLITE_OK.
** Otherwise, if an error occurs, *pRc is set to an SQLite error code. The
** return value is undefined in this case.
*/
static u64 fts3ChecksumIndex(
  Fts3Table *p,                   /* FTS3 table handle */
  int iLangid,                    /* Language id to return cksum for */
  int iIndex,                     /* Index to cksum (0..p->nIndex-1) */
  int *pRc                        /* OUT: Return code */
){
  Fts3SegFilter filter;
  Fts3MultiSegReader csr;
  int rc;
  u64 cksum = 0;

  assert( *pRc==SQLITE_OK );

  memset(&filter, 0, sizeof(filter));
  memset(&csr, 0, sizeof(csr));
  filter.flags =  FTS3_SEGMENT_REQUIRE_POS|FTS3_SEGMENT_IGNORE_EMPTY;
  filter.flags |= FTS3_SEGMENT_SCAN;

  rc = sqlite3Fts3SegReaderCursor(
      p, iLangid, iIndex, FTS3_SEGCURSOR_ALL, 0, 0, 0, 1,&csr
  );
  if( rc==SQLITE_OK ){
    rc = sqlite3Fts3SegReaderStart(p, &csr, &filter);
  }

  if( rc==SQLITE_OK ){
    while( SQLITE_ROW==(rc = sqlite3Fts3SegReaderStep(p, &csr)) ){
      char *pCsr = csr.aDoclist;
      char *pEnd = &pCsr[csr.nDoclist];

      i64 iDocid = 0;
      i64 iCol = 0;
      i64 iPos = 0;

      pCsr += sqlite3Fts3GetVarint(pCsr, &iDocid);
      while( pCsr<pEnd ){
        i64 iVal = 0;
        pCsr += sqlite3Fts3GetVarint(pCsr, &iVal);
        if( pCsr<pEnd ){
          if( iVal==0 || iVal==1 ){
            iCol = 0;
            iPos = 0;
            if( iVal ){
              pCsr += sqlite3Fts3GetVarint(pCsr, &iCol);
            }else{
              pCsr += sqlite3Fts3GetVarint(pCsr, &iVal);
              iDocid += iVal;
            }
          }else{
            iPos += (iVal - 2);
            cksum = cksum ^ fts3ChecksumEntry(
                csr.zTerm, csr.nTerm, iLangid, iIndex, iDocid,
                (int)iCol, (int)iPos
            );
          }
        }
      }
    }
  }
  sqlite3Fts3SegReaderFinish(&csr);

  *pRc = rc;
  return cksum;
}

/*
** Check if the contents of the FTS index match the current contents of the
** content table. If no error occurs and the contents do match, set *pbOk
** to true and return SQLITE_OK. Or if the contents do not match, set *pbOk
** to false before returning.
**
** If an error occurs (e.g. an OOM or IO error), return an SQLite error 
** code. The final value of *pbOk is undefined in this case.
*/
static int fts3IntegrityCheck(Fts3Table *p, int *pbOk){
  int rc = SQLITE_OK;             /* Return code */
  u64 cksum1 = 0;                 /* Checksum based on FTS index contents */
  u64 cksum2 = 0;                 /* Checksum based on %_content contents */
  sqlite3_stmt *pAllLangid = 0;   /* Statement to return all language-ids */

  /* This block calculates the checksum according to the FTS index. */
  rc = fts3SqlStmt(p, SQL_SELECT_ALL_LANGID, &pAllLangid, 0);
  if( rc==SQLITE_OK ){
    int rc2;
    sqlite3_bind_int(pAllLangid, 1, p->nIndex);
    while( rc==SQLITE_OK && sqlite3_step(pAllLangid)==SQLITE_ROW ){
      int iLangid = sqlite3_column_int(pAllLangid, 0);
      int i;
      for(i=0; i<p->nIndex; i++){
        cksum1 = cksum1 ^ fts3ChecksumIndex(p, iLangid, i, &rc);
      }
    }
    rc2 = sqlite3_reset(pAllLangid);
    if( rc==SQLITE_OK ) rc = rc2;
  }

  /* This block calculates the checksum according to the %_content table */
  rc = fts3SqlStmt(p, SQL_SELECT_ALL_LANGID, &pAllLangid, 0);
  if( rc==SQLITE_OK ){
    sqlite3_tokenizer_module const *pModule = p->pTokenizer->pModule;
    sqlite3_stmt *pStmt = 0;
    char *zSql;
   
    zSql = sqlite3_mprintf("SELECT %s" , p->zReadExprlist);
    if( !zSql ){
      rc = SQLITE_NOMEM;
    }else{
      rc = sqlite3_prepare_v2(p->db, zSql, -1, &pStmt, 0);
      sqlite3_free(zSql);
    }

    while( rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pStmt) ){
      i64 iDocid = sqlite3_column_int64(pStmt, 0);
      int iLang = langidFromSelect(p, pStmt);
      int iCol;

      for(iCol=0; rc==SQLITE_OK && iCol<p->nColumn; iCol++){
        const char *zText = (const char *)sqlite3_column_text(pStmt, iCol+1);
        int nText = sqlite3_column_bytes(pStmt, iCol+1);
        sqlite3_tokenizer_cursor *pT = 0;

        rc = sqlite3Fts3OpenTokenizer(p->pTokenizer, iLang, zText, nText, &pT);
        while( rc==SQLITE_OK ){
          char const *zToken;       /* Buffer containing token */
          int nToken;               /* Number of bytes in token */
          int iDum1, iDum2;         /* Dummy variables */
          int iPos;                 /* Position of token in zText */

          rc = pModule->xNext(pT, &zToken, &nToken, &iDum1, &iDum2, &iPos);
          if( rc==SQLITE_OK ){
            int i;
            cksum2 = cksum2 ^ fts3ChecksumEntry(
                zToken, nToken, iLang, 0, iDocid, iCol, iPos
            );
            for(i=1; i<p->nIndex; i++){
              if( p->aIndex[i].nPrefix<=nToken ){
                cksum2 = cksum2 ^ fts3ChecksumEntry(
                  zToken, p->aIndex[i].nPrefix, iLang, i, iDocid, iCol, iPos
                );
              }
            }
          }
        }
        if( pT ) pModule->xClose(pT);
        if( rc==SQLITE_DONE ) rc = SQLITE_OK;
      }
    }

    sqlite3_finalize(pStmt);
  }

  *pbOk = (cksum1==cksum2);
  return rc;
}

/*
** Run the integrity-check. If no error occurs and the current contents of
** the FTS index are correct, return SQLITE_OK. Or, if the contents of the
** FTS index are incorrect, return SQLITE_CORRUPT_VTAB.
**
** Or, if an error (e.g. an OOM or IO error) occurs, return an SQLite 
** error code.
**
** The integrity-check works as follows. For each token and indexed token
** prefix in the document set, a 64-bit checksum is calculated (by code
** in fts3ChecksumEntry()) based on the following:
**
**     + The index number (0 for the main index, 1 for the first prefix
**       index etc.),
**     + The token (or token prefix) text itself, 
**     + The language-id of the row it appears in,
**     + The docid of the row it appears in,
**     + The column it appears in, and
**     + The tokens position within that column.
**
** The checksums for all entries in the index are XORed together to create
** a single checksum for the entire index.
**
** The integrity-check code calculates the same checksum in two ways:
**
**     1. By scanning the contents of the FTS index, and 
**     2. By scanning and tokenizing the content table.
**
** If the two checksums are identical, the integrity-check is deemed to have
** passed.
*/
static int fts3DoIntegrityCheck(
  Fts3Table *p                    /* FTS3 table handle */
){
  int rc;
  int bOk = 0;
  rc = fts3IntegrityCheck(p, &bOk);
  if( rc==SQLITE_OK && bOk==0 ) rc = SQLITE_CORRUPT_VTAB;
  return rc;
}

/*
** Handle a 'special' INSERT of the form:
**
**   "INSERT INTO tbl(tbl) VALUES(<expr>)"
**
** Argument pVal contains the result of <expr>. Currently the only 
** meaningful value to insert is the text 'optimize'.
................................................................................

  if( !zVal ){
    return SQLITE_NOMEM;
  }else if( nVal==8 && 0==sqlite3_strnicmp(zVal, "optimize", 8) ){
    rc = fts3DoOptimize(p, 0);
  }else if( nVal==7 && 0==sqlite3_strnicmp(zVal, "rebuild", 7) ){
    rc = fts3DoRebuild(p);
  }else if( nVal==15 && 0==sqlite3_strnicmp(zVal, "integrity-check", 15) ){
    rc = fts3DoIntegrityCheck(p);
  }else if( nVal>6 && 0==sqlite3_strnicmp(zVal, "merge=", 6) ){
    rc = fts3DoIncrmerge(p, &zVal[6]);
  }else if( nVal>10 && 0==sqlite3_strnicmp(zVal, "automerge=", 10) ){
    rc = fts3DoAutoincrmerge(p, &zVal[10]);
#ifdef SQLITE_TEST
  }else if( nVal>9 && 0==sqlite3_strnicmp(zVal, "nodesize=", 9) ){
    p->nNodeSize = atoi(&zVal[9]);
    rc = SQLITE_OK;
  }else if( nVal>11 && 0==sqlite3_strnicmp(zVal, "maxpending=", 9) ){
    p->nMaxPendingData = atoi(&zVal[11]);
    rc = SQLITE_OK;
................................................................................
}

/*
** This function does the work for the xUpdate method of FTS3 virtual
** tables. The schema of the virtual table being:
**
**     CREATE TABLE <table name>( 
**       <user columns>,
**       <table name> HIDDEN, 
**       docid HIDDEN, 
**       <langid> HIDDEN
**     );
**
** 
*/
................................................................................
    }
    if( p->bHasDocsize ){
      fts3InsertDocsize(&rc, p, aSzIns);
    }
    nChng++;
  }

  if( p->bFts4 ){
    fts3UpdateDocTotals(&rc, p, aSzIns, aSzDel, nChng);
  }

 update_out:
  sqlite3_free(aSzIns);
  sqlite3Fts3SegmentsClose(p);
  return rc;
................................................................................
** This function is an fts3ExprIterate() callback used by fts3BestSnippet().
** Each invocation populates an element of the SnippetIter.aPhrase[] array.
*/
static int fts3SnippetFindPositions(Fts3Expr *pExpr, int iPhrase, void *ctx){
  SnippetIter *p = (SnippetIter *)ctx;
  SnippetPhrase *pPhrase = &p->aPhrase[iPhrase];
  char *pCsr;
  int rc;

  pPhrase->nToken = pExpr->pPhrase->nToken;

  rc = sqlite3Fts3EvalPhrasePoslist(p->pCsr, pExpr, p->iCol, &pCsr);
  assert( rc==SQLITE_OK || pCsr==0 );
  if( pCsr ){
    int iFirst = 0;
    pPhrase->pList = pCsr;
    fts3GetDeltaPosition(&pCsr, &iFirst);
    assert( iFirst>=0 );
    pPhrase->pHead = pCsr;
    pPhrase->pTail = pCsr;
    pPhrase->iHead = iFirst;
    pPhrase->iTail = iFirst;
  }else{
    assert( rc!=SQLITE_OK || (
       pPhrase->pList==0 && pPhrase->pHead==0 && pPhrase->pTail==0 
    ));
  }

  return rc;
}

/*
** Select the fragment of text consisting of nFragment contiguous tokens 
** from column iCol that represent the "best" snippet. The best snippet
** is the snippet with the highest score, where scores are calculated
** by adding:
................................................................................
** array that are different for each row returned by the query.
*/
static int fts3ExprLocalHitsCb(
  Fts3Expr *pExpr,                /* Phrase expression node */
  int iPhrase,                    /* Phrase number */
  void *pCtx                      /* Pointer to MatchInfo structure */
){
  int rc = SQLITE_OK;
  MatchInfo *p = (MatchInfo *)pCtx;
  int iStart = iPhrase * p->nCol * 3;
  int i;

  for(i=0; i<p->nCol && rc==SQLITE_OK; i++){
    char *pCsr;
    rc = sqlite3Fts3EvalPhrasePoslist(p->pCursor, pExpr, i, &pCsr);
    if( pCsr ){
      p->aMatchinfo[iStart+i*3] = fts3ColumnlistCount(&pCsr);
    }else{
      p->aMatchinfo[iStart+i*3] = 0;
    }
  }

  return rc;
}

static int fts3MatchinfoCheck(
  Fts3Table *pTab, 
  char cArg,
  char **pzErr
){
  if( (cArg==FTS3_MATCHINFO_NPHRASE)
   || (cArg==FTS3_MATCHINFO_NCOL)
   || (cArg==FTS3_MATCHINFO_NDOC && pTab->bFts4)
   || (cArg==FTS3_MATCHINFO_AVGLENGTH && pTab->bFts4)
   || (cArg==FTS3_MATCHINFO_LENGTH && pTab->bHasDocsize)
   || (cArg==FTS3_MATCHINFO_LCS)
   || (cArg==FTS3_MATCHINFO_HITS)
  ){
    return SQLITE_OK;
  }
  *pzErr = sqlite3_mprintf("unrecognized matchinfo request: %c", cArg);
................................................................................
  }

  for(iCol=0; iCol<pInfo->nCol; iCol++){
    int nLcs = 0;                 /* LCS value for this column */
    int nLive = 0;                /* Number of iterators in aIter not at EOF */

    for(i=0; i<pInfo->nPhrase; i++){
      int rc;
      LcsIterator *pIt = &aIter[i];
      rc = sqlite3Fts3EvalPhrasePoslist(pCsr, pIt->pExpr, iCol, &pIt->pRead);
      if( rc!=SQLITE_OK ) return rc;
      if( pIt->pRead ){
        pIt->iPos = pIt->iPosOffset;
        fts3LcsIteratorAdvance(&aIter[i]);
        nLive++;
      }
    }

................................................................................
*/
static int fts3ExprTermOffsetInit(Fts3Expr *pExpr, int iPhrase, void *ctx){
  TermOffsetCtx *p = (TermOffsetCtx *)ctx;
  int nTerm;                      /* Number of tokens in phrase */
  int iTerm;                      /* For looping through nTerm phrase terms */
  char *pList;                    /* Pointer to position list for phrase */
  int iPos = 0;                   /* First position in position-list */
  int rc;

  UNUSED_PARAMETER(iPhrase);
  rc = sqlite3Fts3EvalPhrasePoslist(p->pCsr, pExpr, p->iCol, &pList);
  nTerm = pExpr->pPhrase->nToken;
  if( pList ){
    fts3GetDeltaPosition(&pList, &iPos);
    assert( iPos>=0 );
  }

  for(iTerm=0; iTerm<nTerm; iTerm++){
    TermOffset *pT = &p->aTerm[p->iTerm++];
    pT->iOff = nTerm-iTerm-1;
    pT->pList = pList;
    pT->iPos = iPos;
  }

  return rc;
}

/*
** Implementation of offsets() function.
*/
SQLITE_PRIVATE void sqlite3Fts3Offsets(
  sqlite3_context *pCtx,          /* SQLite function call context */
................................................................................
  int eCoordType;
};

/* Possible values for eCoordType: */
#define RTREE_COORD_REAL32 0
#define RTREE_COORD_INT32  1

/*
** If SQLITE_RTREE_INT_ONLY is defined, then this virtual table will
** only deal with integer coordinates.  No floating point operations
** will be done.
*/
#ifdef SQLITE_RTREE_INT_ONLY
  typedef sqlite3_int64 RtreeDValue;       /* High accuracy coordinate */
  typedef int RtreeValue;                  /* Low accuracy coordinate */
#else
  typedef double RtreeDValue;              /* High accuracy coordinate */
  typedef float RtreeValue;                /* Low accuracy coordinate */
#endif

/*
** The minimum number of cells allowed for a node is a third of the 
** maximum. In Gutman's notation:
**
**     m = M/3
**
** If an R*-tree "Reinsert" operation is required, the same number of
................................................................................
  int iCell;                        /* Index of current cell in pNode */
  int iStrategy;                    /* Copy of idxNum search parameter */
  int nConstraint;                  /* Number of entries in aConstraint */
  RtreeConstraint *aConstraint;     /* Search constraints. */
};

union RtreeCoord {
  RtreeValue f;
  int i;
};

/*
** The argument is an RtreeCoord. Return the value stored within the RtreeCoord
** formatted as a RtreeDValue (double or int64). This macro assumes that local
** variable pRtree points to the Rtree structure associated with the
** RtreeCoord.
*/
#ifdef SQLITE_RTREE_INT_ONLY
# define DCOORD(coord) ((RtreeDValue)coord.i)
#else
# define DCOORD(coord) (                           \
    (pRtree->eCoordType==RTREE_COORD_REAL32) ?      \
      ((double)coord.f) :                           \
      ((double)coord.i)                             \
  )
#endif

/*
** A search constraint.
*/
struct RtreeConstraint {
  int iCoord;                     /* Index of constrained coordinate */
  int op;                         /* Constraining operation */
  RtreeDValue rValue;             /* Constraint value. */
  int (*xGeom)(sqlite3_rtree_geometry*, int, RtreeDValue*, int*);
  sqlite3_rtree_geometry *pGeom;  /* Constraint callback argument for a MATCH */
};

/* Possible values for RtreeConstraint.op */
#define RTREE_EQ    0x41
#define RTREE_LE    0x42
#define RTREE_LT    0x43
................................................................................
/*
** An instance of this structure must be supplied as a blob argument to
** the right-hand-side of an SQL MATCH operator used to constrain an
** r-tree query.
*/
struct RtreeMatchArg {
  u32 magic;                      /* Always RTREE_GEOMETRY_MAGIC */
  int (*xGeom)(sqlite3_rtree_geometry *, int, RtreeDValue*, int *);
  void *pContext;
  int nParam;
  RtreeDValue aParam[1];
};

/*
** When a geometry callback is created (see sqlite3_rtree_geometry_callback),
** a single instance of the following structure is allocated. It is used
** as the context for the user-function created by by s_r_g_c(). The object
** is eventually deleted by the destructor mechanism provided by
** sqlite3_create_function_v2() (which is called by s_r_g_c() to create
** the geometry callback function).
*/
struct RtreeGeomCallback {
  int (*xGeom)(sqlite3_rtree_geometry*, int, RtreeDValue*, int*);
  void *pContext;
};

#ifndef MAX
# define MAX(x,y) ((x) < (y) ? (y) : (x))
#endif
#ifndef MIN
................................................................................
static int testRtreeGeom(
  Rtree *pRtree,                  /* R-Tree object */
  RtreeConstraint *pConstraint,   /* MATCH constraint to test */
  RtreeCell *pCell,               /* Cell to test */
  int *pbRes                      /* OUT: Test result */
){
  int i;
  RtreeDValue aCoord[RTREE_MAX_DIMENSIONS*2];
  int nCoord = pRtree->nDim*2;

  assert( pConstraint->op==RTREE_MATCH );
  assert( pConstraint->pGeom );

  for(i=0; i<nCoord; i++){
    aCoord[i] = DCOORD(pCell->aCoord[i]);
................................................................................
  int ii;
  int bRes = 0;
  int rc = SQLITE_OK;

  nodeGetCell(pRtree, pCursor->pNode, pCursor->iCell, &cell);
  for(ii=0; bRes==0 && ii<pCursor->nConstraint; ii++){
    RtreeConstraint *p = &pCursor->aConstraint[ii];
    RtreeDValue cell_min = DCOORD(cell.aCoord[(p->iCoord>>1)*2]);
    RtreeDValue cell_max = DCOORD(cell.aCoord[(p->iCoord>>1)*2+1]);

    assert(p->op==RTREE_LE || p->op==RTREE_LT || p->op==RTREE_GE 
        || p->op==RTREE_GT || p->op==RTREE_EQ || p->op==RTREE_MATCH
    );

    switch( p->op ){
      case RTREE_LE: case RTREE_LT: 
................................................................................
  RtreeCell cell;
  int ii;
  *pbEof = 0;

  nodeGetCell(pRtree, pCursor->pNode, pCursor->iCell, &cell);
  for(ii=0; ii<pCursor->nConstraint; ii++){
    RtreeConstraint *p = &pCursor->aConstraint[ii];
    RtreeDValue coord = DCOORD(cell.aCoord[p->iCoord]);
    int res;
    assert(p->op==RTREE_LE || p->op==RTREE_LT || p->op==RTREE_GE 
        || p->op==RTREE_GT || p->op==RTREE_EQ || p->op==RTREE_MATCH
    );
    switch( p->op ){
      case RTREE_LE: res = (coord<=p->rValue); break;
      case RTREE_LT: res = (coord<p->rValue);  break;
................................................................................

  if( i==0 ){
    i64 iRowid = nodeGetRowid(pRtree, pCsr->pNode, pCsr->iCell);
    sqlite3_result_int64(ctx, iRowid);
  }else{
    RtreeCoord c;
    nodeGetCoord(pRtree, pCsr->pNode, pCsr->iCell, i-1, &c);
#ifndef SQLITE_RTREE_INT_ONLY
    if( pRtree->eCoordType==RTREE_COORD_REAL32 ){
      sqlite3_result_double(ctx, c.f);
    }else
#endif
    {
      assert( pRtree->eCoordType==RTREE_COORD_INT32 );
      sqlite3_result_int(ctx, c.i);
    }
  }

  return SQLITE_OK;
}
................................................................................

  /* Check that value is actually a blob. */
  if( sqlite3_value_type(pValue)!=SQLITE_BLOB ) return SQLITE_ERROR;

  /* Check that the blob is roughly the right size. */
  nBlob = sqlite3_value_bytes(pValue);
  if( nBlob<(int)sizeof(RtreeMatchArg) 
   || ((nBlob-sizeof(RtreeMatchArg))%sizeof(RtreeDValue))!=0
  ){
    return SQLITE_ERROR;
  }

  pGeom = (sqlite3_rtree_geometry *)sqlite3_malloc(
      sizeof(sqlite3_rtree_geometry) + nBlob
  );
  if( !pGeom ) return SQLITE_NOMEM;
  memset(pGeom, 0, sizeof(sqlite3_rtree_geometry));
  p = (RtreeMatchArg *)&pGeom[1];

  memcpy(p, sqlite3_value_blob(pValue), nBlob);
  if( p->magic!=RTREE_GEOMETRY_MAGIC 
   || nBlob!=(int)(sizeof(RtreeMatchArg) + (p->nParam-1)*sizeof(RtreeDValue))
  ){
    sqlite3_free(pGeom);
    return SQLITE_ERROR;
  }

  pGeom->pContext = p->pContext;
  pGeom->nParam = p->nParam;
................................................................................
            ** an sqlite3_rtree_geometry_callback() SQL user function.
            */
            rc = deserializeGeometry(argv[ii], p);
            if( rc!=SQLITE_OK ){
              break;
            }
          }else{
#ifdef SQLITE_RTREE_INT_ONLY
            p->rValue = sqlite3_value_int64(argv[ii]);
#else
            p->rValue = sqlite3_value_double(argv[ii]);
#endif
          }
        }
      }
    }
  
    if( rc==SQLITE_OK ){
      pCsr->pNode = 0;
................................................................................
  pIdxInfo->estimatedCost = (2000000.0 / (double)(iIdx + 1));
  return rc;
}

/*
** Return the N-dimensional volumn of the cell stored in *p.
*/
static RtreeDValue cellArea(Rtree *pRtree, RtreeCell *p){
  RtreeDValue area = (RtreeDValue)1;
  int ii;
  for(ii=0; ii<(pRtree->nDim*2); ii+=2){
    area = (area * (DCOORD(p->aCoord[ii+1]) - DCOORD(p->aCoord[ii])));
  }
  return area;
}

/*
** Return the margin length of cell p. The margin length is the sum
** of the objects size in each dimension.
*/
static RtreeDValue cellMargin(Rtree *pRtree, RtreeCell *p){
  RtreeDValue margin = (RtreeDValue)0;
  int ii;
  for(ii=0; ii<(pRtree->nDim*2); ii+=2){
    margin += (DCOORD(p->aCoord[ii+1]) - DCOORD(p->aCoord[ii]));
  }
  return margin;
}

/*
** Store the union of cells p1 and p2 in p1.
*/
................................................................................
  }
  return 1;
}

/*
** Return the amount cell p would grow by if it were unioned with pCell.
*/
static RtreeDValue cellGrowth(Rtree *pRtree, RtreeCell *p, RtreeCell *pCell){
  RtreeDValue area;
  RtreeCell cell;
  memcpy(&cell, p, sizeof(RtreeCell));
  area = cellArea(pRtree, &cell);
  cellUnion(pRtree, &cell, pCell);
  return (cellArea(pRtree, &cell)-area);
}

#if VARIANT_RSTARTREE_CHOOSESUBTREE || VARIANT_RSTARTREE_SPLIT
static RtreeDValue cellOverlap(
  Rtree *pRtree, 
  RtreeCell *p, 
  RtreeCell *aCell, 
  int nCell, 
  int iExclude
){
  int ii;
  RtreeDValue overlap = 0.0;
  for(ii=0; ii<nCell; ii++){
#if VARIANT_RSTARTREE_CHOOSESUBTREE
    if( ii!=iExclude )
#else
    assert( iExclude==-1 );
    UNUSED_PARAMETER(iExclude);
#endif
    {
      int jj;
      RtreeDValue o = (RtreeDValue)1;
      for(jj=0; jj<(pRtree->nDim*2); jj+=2){
        RtreeDValue x1, x2;


        x1 = MAX(DCOORD(p->aCoord[jj]), DCOORD(aCell[ii].aCoord[jj]));
        x2 = MIN(DCOORD(p->aCoord[jj+1]), DCOORD(aCell[ii].aCoord[jj+1]));

        if( x2<x1 ){
          o = 0.0;
          break;
        }else{
          o = o * (x2-x1);
        }
      }
      overlap += o;
    }
  }
  return overlap;
}
#endif

#if VARIANT_RSTARTREE_CHOOSESUBTREE
static RtreeDValue cellOverlapEnlargement(
  Rtree *pRtree, 
  RtreeCell *p, 
  RtreeCell *pInsert, 
  RtreeCell *aCell, 
  int nCell, 
  int iExclude
){
  RtreeDValue before, after;

  before = cellOverlap(pRtree, p, aCell, nCell, iExclude);
  cellUnion(pRtree, p, pInsert);
  after = cellOverlap(pRtree, p, aCell, nCell, iExclude);
  return (after-before);
}
#endif


/*
** This function implements the ChooseLeaf algorithm from Gutman[84].
** ChooseSubTree in r*tree terminology.
................................................................................
  RtreeNode *pNode;
  rc = nodeAcquire(pRtree, 1, 0, &pNode);

  for(ii=0; rc==SQLITE_OK && ii<(pRtree->iDepth-iHeight); ii++){
    int iCell;
    sqlite3_int64 iBest = 0;

    RtreeDValue fMinGrowth = 0.0;
    RtreeDValue fMinArea = 0.0;
#if VARIANT_RSTARTREE_CHOOSESUBTREE
    RtreeDValue fMinOverlap = 0.0;
    RtreeDValue overlap;
#endif

    int nCell = NCELL(pNode);
    RtreeCell cell;
    RtreeNode *pChild;

    RtreeCell *aCell = 0;
................................................................................

    /* Select the child node which will be enlarged the least if pCell
    ** is inserted into it. Resolve ties by choosing the entry with
    ** the smallest area.
    */
    for(iCell=0; iCell<nCell; iCell++){
      int bBest = 0;
      RtreeDValue growth;
      RtreeDValue area;
      nodeGetCell(pRtree, pNode, iCell, &cell);
      growth = cellGrowth(pRtree, &cell, pCell);
      area = cellArea(pRtree, &cell);

#if VARIANT_RSTARTREE_CHOOSESUBTREE
      if( ii==(pRtree->iDepth-1) ){
        overlap = cellOverlapEnlargement(pRtree,&cell,pCell,aCell,nCell,iCell);
................................................................................
  int nCell, 
  int *piLeftSeed, 
  int *piRightSeed
){
  int i;
  int iLeftSeed = 0;
  int iRightSeed = 1;
  RtreeDValue maxNormalInnerWidth = (RtreeDValue)0;

  /* Pick two "seed" cells from the array of cells. The algorithm used
  ** here is the LinearPickSeeds algorithm from Gutman[1984]. The 
  ** indices of the two seed cells in the array are stored in local
  ** variables iLeftSeek and iRightSeed.
  */
  for(i=0; i<pRtree->nDim; i++){
    RtreeDValue x1 = DCOORD(aCell[0].aCoord[i*2]);
    RtreeDValue x2 = DCOORD(aCell[0].aCoord[i*2+1]);
    RtreeDValue x3 = x1;
    RtreeDValue x4 = x2;
    int jj;

    int iCellLeft = 0;
    int iCellRight = 0;

    for(jj=1; jj<nCell; jj++){
      RtreeDValue left = DCOORD(aCell[jj].aCoord[i*2]);
      RtreeDValue right = DCOORD(aCell[jj].aCoord[i*2+1]);

      if( left<x1 ) x1 = left;
      if( right>x4 ) x4 = right;
      if( left>x3 ){
        x3 = left;
        iCellRight = jj;
      }
................................................................................
      if( right<x2 ){
        x2 = right;
        iCellLeft = jj;
      }
    }

    if( x4!=x1 ){
      RtreeDValue normalwidth = (x3 - x2) / (x4 - x1);
      if( normalwidth>maxNormalInnerWidth ){
        iLeftSeed = iCellLeft;
        iRightSeed = iCellRight;
      }
    }
  }

................................................................................
  RtreeCell *pLeftBox, 
  RtreeCell *pRightBox,
  int *aiUsed
){
  #define FABS(a) ((a)<0.0?-1.0*(a):(a))

  int iSelect = -1;
  RtreeDValue fDiff;
  int ii;
  for(ii=0; ii<nCell; ii++){
    if( aiUsed[ii]==0 ){
      RtreeDValue left = cellGrowth(pRtree, pLeftBox, &aCell[ii]);
      RtreeDValue right = cellGrowth(pRtree, pLeftBox, &aCell[ii]);
      RtreeDValue diff = FABS(right-left);
      if( iSelect<0 || diff>fDiff ){
        fDiff = diff;
        iSelect = ii;
      }
    }
  }
  aiUsed[iSelect] = 1;
................................................................................
  int *piRightSeed
){
  int ii;
  int jj;

  int iLeftSeed = 0;
  int iRightSeed = 1;
  RtreeDValue fWaste = 0.0;

  for(ii=0; ii<nCell; ii++){
    for(jj=ii+1; jj<nCell; jj++){
      RtreeDValue right = cellArea(pRtree, &aCell[jj]);
      RtreeDValue growth = cellGrowth(pRtree, &aCell[ii], &aCell[jj]);
      RtreeDValue waste = growth - right;

      if( waste>fWaste ){
        iLeftSeed = ii;
        iRightSeed = jj;
        fWaste = waste;
      }
    }
................................................................................
**
** The aSpare array is used as temporary working space by the
** sorting algorithm.
*/
static void SortByDistance(
  int *aIdx, 
  int nIdx, 
  RtreeDValue *aDistance, 
  int *aSpare
){
  if( nIdx>1 ){
    int iLeft = 0;
    int iRight = 0;

    int nLeft = nIdx/2;
................................................................................
      if( iLeft==nLeft ){
        aIdx[iLeft+iRight] = aRight[iRight];
        iRight++;
      }else if( iRight==nRight ){
        aIdx[iLeft+iRight] = aLeft[iLeft];
        iLeft++;
      }else{
        RtreeDValue fLeft = aDistance[aLeft[iLeft]];
        RtreeDValue fRight = aDistance[aRight[iRight]];
        if( fLeft<fRight ){
          aIdx[iLeft+iRight] = aLeft[iLeft];
          iLeft++;
        }else{
          aIdx[iLeft+iRight] = aRight[iRight];
          iRight++;
        }
................................................................................
    }

#if 0
    /* Check that the sort worked */
    {
      int jj;
      for(jj=1; jj<nIdx; jj++){
        RtreeDValue left = aDistance[aIdx[jj-1]];
        RtreeDValue right = aDistance[aIdx[jj]];
        assert( left<=right );
      }
    }
#endif
  }
}

................................................................................

    SortByDimension(pRtree, aLeft, nLeft, iDim, aCell, aSpare);
    SortByDimension(pRtree, aRight, nRight, iDim, aCell, aSpare);

    memcpy(aSpare, aLeft, sizeof(int)*nLeft);
    aLeft = aSpare;
    while( iLeft<nLeft || iRight<nRight ){
      RtreeDValue xleft1 = DCOORD(aCell[aLeft[iLeft]].aCoord[iDim*2]);
      RtreeDValue xleft2 = DCOORD(aCell[aLeft[iLeft]].aCoord[iDim*2+1]);
      RtreeDValue xright1 = DCOORD(aCell[aRight[iRight]].aCoord[iDim*2]);
      RtreeDValue xright2 = DCOORD(aCell[aRight[iRight]].aCoord[iDim*2+1]);
      if( (iLeft!=nLeft) && ((iRight==nRight)
       || (xleft1<xright1)
       || (xleft1==xright1 && xleft2<xright2)
      )){
        aIdx[iLeft+iRight] = aLeft[iLeft];
        iLeft++;
      }else{
................................................................................
    }

#if 0
    /* Check that the sort worked */
    {
      int jj;
      for(jj=1; jj<nIdx; jj++){
        RtreeDValue xleft1 = aCell[aIdx[jj-1]].aCoord[iDim*2];
        RtreeDValue xleft2 = aCell[aIdx[jj-1]].aCoord[iDim*2+1];
        RtreeDValue xright1 = aCell[aIdx[jj]].aCoord[iDim*2];
        RtreeDValue xright2 = aCell[aIdx[jj]].aCoord[iDim*2+1];
        assert( xleft1<=xright1 && (xleft1<xright1 || xleft2<=xright2) );
      }
    }
#endif
  }
}

................................................................................
){
  int **aaSorted;
  int *aSpare;
  int ii;

  int iBestDim = 0;
  int iBestSplit = 0;
  RtreeDValue fBestMargin = 0.0;

  int nByte = (pRtree->nDim+1)*(sizeof(int*)+nCell*sizeof(int));

  aaSorted = (int **)sqlite3_malloc(nByte);
  if( !aaSorted ){
    return SQLITE_NOMEM;
  }
................................................................................
    for(jj=0; jj<nCell; jj++){
      aaSorted[ii][jj] = jj;
    }
    SortByDimension(pRtree, aaSorted[ii], nCell, ii, aCell, aSpare);
  }

  for(ii=0; ii<pRtree->nDim; ii++){
    RtreeDValue margin = 0.0;
    RtreeDValue fBestOverlap = 0.0;
    RtreeDValue fBestArea = 0.0;
    int iBestLeft = 0;
    int nLeft;

    for(
      nLeft=RTREE_MINCELLS(pRtree); 
      nLeft<=(nCell-RTREE_MINCELLS(pRtree)); 
      nLeft++
    ){
      RtreeCell left;
      RtreeCell right;
      int kk;
      RtreeDValue overlap;
      RtreeDValue area;

      memcpy(&left, &aCell[aaSorted[ii][0]], sizeof(RtreeCell));
      memcpy(&right, &aCell[aaSorted[ii][nCell-1]], sizeof(RtreeCell));
      for(kk=1; kk<(nCell-1); kk++){
        if( kk<nLeft ){
          cellUnion(pRtree, &left, &aCell[aaSorted[ii][kk]]);
        }else{
................................................................................
  nodeInsertCell(pRtree, pRight, &aCell[iRightSeed]);
  aiUsed[iLeftSeed] = 1;
  aiUsed[iRightSeed] = 1;

  for(i=nCell-2; i>0; i--){
    RtreeCell *pNext;
    pNext = PickNext(pRtree, aCell, nCell, pBboxLeft, pBboxRight, aiUsed);
    RtreeDValue diff =  
      cellGrowth(pRtree, pBboxLeft, pNext) - 
      cellGrowth(pRtree, pBboxRight, pNext)
    ;
    if( (RTREE_MINCELLS(pRtree)-NCELL(pRight)==i)
     || (diff>0.0 && (RTREE_MINCELLS(pRtree)-NCELL(pLeft)!=i))
    ){
      nodeInsertCell(pRtree, pRight, pNext);
................................................................................
  RtreeNode *pNode, 
  RtreeCell *pCell, 
  int iHeight
){
  int *aOrder;
  int *aSpare;
  RtreeCell *aCell;
  RtreeDValue *aDistance;
  int nCell;
  RtreeDValue aCenterCoord[RTREE_MAX_DIMENSIONS];
  int iDim;
  int ii;
  int rc = SQLITE_OK;
  int n;

  memset(aCenterCoord, 0, sizeof(RtreeDValue)*RTREE_MAX_DIMENSIONS);

  nCell = NCELL(pNode)+1;
  n = (nCell+1)&(~1);

  /* Allocate the buffers used by this operation. The allocation is
  ** relinquished before this function returns.
  */
  aCell = (RtreeCell *)sqlite3_malloc(n * (
    sizeof(RtreeCell)     +         /* aCell array */
    sizeof(int)           +         /* aOrder array */
    sizeof(int)           +         /* aSpare array */
    sizeof(RtreeDValue)             /* aDistance array */
  ));
  if( !aCell ){
    return SQLITE_NOMEM;
  }
  aOrder    = (int *)&aCell[n];
  aSpare    = (int *)&aOrder[n];
  aDistance = (RtreeDValue *)&aSpare[n];

  for(ii=0; ii<nCell; ii++){
    if( ii==(nCell-1) ){
      memcpy(&aCell[ii], pCell, sizeof(RtreeCell));
    }else{
      nodeGetCell(pRtree, pNode, ii, &aCell[ii]);
    }
    aOrder[ii] = ii;
    for(iDim=0; iDim<pRtree->nDim; iDim++){
      aCenterCoord[iDim] += DCOORD(aCell[ii].aCoord[iDim*2]);
      aCenterCoord[iDim] += DCOORD(aCell[ii].aCoord[iDim*2+1]);
    }
  }
  for(iDim=0; iDim<pRtree->nDim; iDim++){
    aCenterCoord[iDim] = (aCenterCoord[iDim]/(nCell*(RtreeDValue)2));
  }

  for(ii=0; ii<nCell; ii++){
    aDistance[ii] = 0.0;
    for(iDim=0; iDim<pRtree->nDim; iDim++){
      RtreeDValue coord = (DCOORD(aCell[ii].aCoord[iDim*2+1]) - 
                               DCOORD(aCell[ii].aCoord[iDim*2]));
      aDistance[ii] += (coord-aCenterCoord[iDim])*(coord-aCenterCoord[iDim]);
    }
  }

  SortByDistance(aOrder, nCell, aDistance, aSpare);
  nodeZero(pRtree, pNode);

................................................................................
  ** conflict-handling mode specified by the user.
  */
  if( nData>1 ){
    int ii;

    /* Populate the cell.aCoord[] array. The first coordinate is azData[3]. */
    assert( nData==(pRtree->nDim*2 + 3) );
#ifndef SQLITE_RTREE_INT_ONLY
    if( pRtree->eCoordType==RTREE_COORD_REAL32 ){
      for(ii=0; ii<(pRtree->nDim*2); ii+=2){
        cell.aCoord[ii].f = (RtreeValue)sqlite3_value_double(azData[ii+3]);
        cell.aCoord[ii+1].f = (RtreeValue)sqlite3_value_double(azData[ii+4]);
        if( cell.aCoord[ii].f>cell.aCoord[ii+1].f ){
          rc = SQLITE_CONSTRAINT;
          goto constraint;
        }
      }
    }else
#endif
    {
      for(ii=0; ii<(pRtree->nDim*2); ii+=2){
        cell.aCoord[ii].i = sqlite3_value_int(azData[ii+3]);
        cell.aCoord[ii+1].i = sqlite3_value_int(azData[ii+4]);
        if( cell.aCoord[ii].i>cell.aCoord[ii+1].i ){
          rc = SQLITE_CONSTRAINT;
          goto constraint;
        }
................................................................................
    RtreeCell cell;
    int jj;

    nodeGetCell(&tree, &node, ii, &cell);
    sqlite3_snprintf(512-nCell,&zCell[nCell],"%lld", cell.iRowid);
    nCell = (int)strlen(zCell);
    for(jj=0; jj<tree.nDim*2; jj++){
#ifndef SQLITE_RTREE_INT_ONLY
      sqlite3_snprintf(512-nCell,&zCell[nCell], " %f",
                       (double)cell.aCoord[jj].f);
#else
      sqlite3_snprintf(512-nCell,&zCell[nCell], " %d",
                       cell.aCoord[jj].i);
#endif
      nCell = (int)strlen(zCell);
    }

    if( zText ){
      char *zTextNew = sqlite3_mprintf("%s {%s}", zText, zCell);
      sqlite3_free(zText);
      zText = zTextNew;
................................................................................
  int rc;

  rc = sqlite3_create_function(db, "rtreenode", 2, utf8, 0, rtreenode, 0, 0);
  if( rc==SQLITE_OK ){
    rc = sqlite3_create_function(db, "rtreedepth", 1, utf8, 0,rtreedepth, 0, 0);
  }
  if( rc==SQLITE_OK ){
#ifdef SQLITE_RTREE_INT_ONLY
    void *c = (void *)RTREE_COORD_INT32;
#else
    void *c = (void *)RTREE_COORD_REAL32;
#endif
    rc = sqlite3_create_module_v2(db, "rtree", &rtreeModule, c, 0);
  }
  if( rc==SQLITE_OK ){
    void *c = (void *)RTREE_COORD_INT32;
    rc = sqlite3_create_module_v2(db, "rtree_i32", &rtreeModule, c, 0);
  }

................................................................................
** table MATCH operators.
*/
static void geomCallback(sqlite3_context *ctx, int nArg, sqlite3_value **aArg){
  RtreeGeomCallback *pGeomCtx = (RtreeGeomCallback *)sqlite3_user_data(ctx);
  RtreeMatchArg *pBlob;
  int nBlob;

  nBlob = sizeof(RtreeMatchArg) + (nArg-1)*sizeof(RtreeDValue);
  pBlob = (RtreeMatchArg *)sqlite3_malloc(nBlob);
  if( !pBlob ){
    sqlite3_result_error_nomem(ctx);
  }else{
    int i;
    pBlob->magic = RTREE_GEOMETRY_MAGIC;
    pBlob->xGeom = pGeomCtx->xGeom;
    pBlob->pContext = pGeomCtx->pContext;
    pBlob->nParam = nArg;
    for(i=0; i<nArg; i++){
#ifdef SQLITE_RTREE_INT_ONLY
      pBlob->aParam[i] = sqlite3_value_int64(aArg[i]);
#else
      pBlob->aParam[i] = sqlite3_value_double(aArg[i]);
#endif
    }
    sqlite3_result_blob(ctx, pBlob, nBlob, doSqlite3Free);
  }
}

/*
** Register a new geometry function for use with the r-tree MATCH operator.
*/
SQLITE_API int sqlite3_rtree_geometry_callback(
  sqlite3 *db,
  const char *zGeom,
  int (*xGeom)(sqlite3_rtree_geometry *, int, RtreeDValue *, int *),
  void *pContext
){
  RtreeGeomCallback *pGeomCtx;      /* Context object for new user-function */

  /* Allocate and populate the context object. */
  pGeomCtx = (RtreeGeomCallback *)sqlite3_malloc(sizeof(RtreeGeomCallback));
  if( !pGeomCtx ) return SQLITE_NOMEM;
................................................................................

  UChar32 c;
  int iInput = 0;
  int iOut = 0;

  *ppCursor = 0;

  if( zInput==0 ){
    nInput = 0;
    zInput = "";
  }else if( nInput<0 ){
    nInput = strlen(zInput);
  }
  nChar = nInput+1;
  pCsr = (IcuCursor *)sqlite3_malloc(
      sizeof(IcuCursor) +                /* IcuCursor */
      nChar * sizeof(UChar) +            /* IcuCursor.aChar[] */
      (nChar+1) * sizeof(int)            /* IcuCursor.aOffset[] */

** string contains the date and time of the check-in (UTC) and an SHA1
** hash of the entire source tree.
**
** See also: [sqlite3_libversion()],
** [sqlite3_libversion_number()], [sqlite3_sourceid()],
** [sqlite_version()] and [sqlite_source_id()].
*/
#define SQLITE_VERSION        "3.7.11"
#define SQLITE_VERSION_NUMBER 3007011
#define SQLITE_SOURCE_ID      "2012-03-19 14:57:49 bc03d99a78e90c02b69037e5f5f81537b5a3ac60"

/*
** CAPI3REF: Run-Time Library Version Numbers
** KEYWORDS: sqlite3_version, sqlite3_sourceid
**
** These interfaces provide the same information as the [SQLITE_VERSION],
** [SQLITE_VERSION_NUMBER], and [SQLITE_SOURCE_ID] C preprocessor macros
................................................................................
#define SQLITE_IOERR_SHMSIZE           (SQLITE_IOERR | (19<<8))
#define SQLITE_IOERR_SHMLOCK           (SQLITE_IOERR | (20<<8))
#define SQLITE_IOERR_SHMMAP            (SQLITE_IOERR | (21<<8))
#define SQLITE_IOERR_SEEK              (SQLITE_IOERR | (22<<8))
#define SQLITE_LOCKED_SHAREDCACHE      (SQLITE_LOCKED |  (1<<8))
#define SQLITE_BUSY_RECOVERY           (SQLITE_BUSY   |  (1<<8))
#define SQLITE_CANTOPEN_NOTEMPDIR      (SQLITE_CANTOPEN | (1<<8))

#define SQLITE_CORRUPT_VTAB            (SQLITE_CORRUPT | (1<<8))
#define SQLITE_READONLY_RECOVERY       (SQLITE_READONLY | (1<<8))
#define SQLITE_READONLY_CANTLOCK       (SQLITE_READONLY | (2<<8))
#define SQLITE_ABORT_ROLLBACK          (SQLITE_ABORT | (2<<8))

/*
** CAPI3REF: Flags For File Open Operations
................................................................................
** connection is opened. If it is globally disabled, filenames are
** only interpreted as URIs if the SQLITE_OPEN_URI flag is set when the
** database connection is opened. By default, URI handling is globally
** disabled. The default value may be changed by compiling with the
** [SQLITE_USE_URI] symbol defined.
**
** [[SQLITE_CONFIG_PCACHE]] [[SQLITE_CONFIG_GETPCACHE]]
** <dt>SQLITE_CONFIG_PCACHE and SQLITE_CONFNIG_GETPCACHE
** <dd> These options are obsolete and should not be used by new code.
** They are retained for backwards compatibility but are now no-ops.
** </dl>
*/
#define SQLITE_CONFIG_SINGLETHREAD  1  /* nil */
#define SQLITE_CONFIG_MULTITHREAD   2  /* nil */
#define SQLITE_CONFIG_SERIALIZED    3  /* nil */
................................................................................
** </dd>
**
** [[SQLITE_DBSTATUS_CACHE_MISS]] ^(<dt>SQLITE_DBSTATUS_CACHE_MISS</dt>
** <dd>This parameter returns the number of pager cache misses that have
** occurred.)^ ^The highwater mark associated with SQLITE_DBSTATUS_CACHE_MISS 
** is always 0.
** </dd>











** </dl>
*/
#define SQLITE_DBSTATUS_LOOKASIDE_USED       0
#define SQLITE_DBSTATUS_CACHE_USED           1
#define SQLITE_DBSTATUS_SCHEMA_USED          2
#define SQLITE_DBSTATUS_STMT_USED            3
#define SQLITE_DBSTATUS_LOOKASIDE_HIT        4
#define SQLITE_DBSTATUS_LOOKASIDE_MISS_SIZE  5
#define SQLITE_DBSTATUS_LOOKASIDE_MISS_FULL  6
#define SQLITE_DBSTATUS_CACHE_HIT            7
#define SQLITE_DBSTATUS_CACHE_MISS           8

#define SQLITE_DBSTATUS_MAX                  8   /* Largest defined DBSTATUS */


/*
** CAPI3REF: Prepared Statement Status
**
** ^(Each prepared statement maintains various
** [SQLITE_STMTSTATUS counters] that measure the number
................................................................................
** R-Tree geometry query as follows:
**
**   SELECT ... FROM <rtree> WHERE <rtree col> MATCH $zGeom(... params ...)
*/
SQLITE_API int sqlite3_rtree_geometry_callback(
  sqlite3 *db,
  const char *zGeom,



  int (*xGeom)(sqlite3_rtree_geometry *, int nCoord, double *aCoord, int *pRes),

  void *pContext
);


/*
** A pointer to a structure of the following type is passed as the first
** argument to callbacks registered using rtree_geometry_callback().

** string contains the date and time of the check-in (UTC) and an SHA1
** hash of the entire source tree.
**
** See also: [sqlite3_libversion()],
** [sqlite3_libversion_number()], [sqlite3_sourceid()],
** [sqlite_version()] and [sqlite_source_id()].
*/
#define SQLITE_VERSION        "3.7.12"
#define SQLITE_VERSION_NUMBER 3007012
#define SQLITE_SOURCE_ID      "2012-05-12 01:14:27 93061c6e063fddfa6b5d21064a36b58cc97599f1"

/*
** CAPI3REF: Run-Time Library Version Numbers
** KEYWORDS: sqlite3_version, sqlite3_sourceid
**
** These interfaces provide the same information as the [SQLITE_VERSION],
** [SQLITE_VERSION_NUMBER], and [SQLITE_SOURCE_ID] C preprocessor macros
................................................................................
#define SQLITE_IOERR_SHMSIZE           (SQLITE_IOERR | (19<<8))
#define SQLITE_IOERR_SHMLOCK           (SQLITE_IOERR | (20<<8))
#define SQLITE_IOERR_SHMMAP            (SQLITE_IOERR | (21<<8))
#define SQLITE_IOERR_SEEK              (SQLITE_IOERR | (22<<8))
#define SQLITE_LOCKED_SHAREDCACHE      (SQLITE_LOCKED |  (1<<8))
#define SQLITE_BUSY_RECOVERY           (SQLITE_BUSY   |  (1<<8))
#define SQLITE_CANTOPEN_NOTEMPDIR      (SQLITE_CANTOPEN | (1<<8))
#define SQLITE_CANTOPEN_ISDIR          (SQLITE_CANTOPEN | (2<<8))
#define SQLITE_CORRUPT_VTAB            (SQLITE_CORRUPT | (1<<8))
#define SQLITE_READONLY_RECOVERY       (SQLITE_READONLY | (1<<8))
#define SQLITE_READONLY_CANTLOCK       (SQLITE_READONLY | (2<<8))
#define SQLITE_ABORT_ROLLBACK          (SQLITE_ABORT | (2<<8))

/*
** CAPI3REF: Flags For File Open Operations
................................................................................
** connection is opened. If it is globally disabled, filenames are
** only interpreted as URIs if the SQLITE_OPEN_URI flag is set when the
** database connection is opened. By default, URI handling is globally
** disabled. The default value may be changed by compiling with the
** [SQLITE_USE_URI] symbol defined.
**
** [[SQLITE_CONFIG_PCACHE]] [[SQLITE_CONFIG_GETPCACHE]]
** <dt>SQLITE_CONFIG_PCACHE and SQLITE_CONFIG_GETPCACHE
** <dd> These options are obsolete and should not be used by new code.
** They are retained for backwards compatibility but are now no-ops.
** </dl>
*/
#define SQLITE_CONFIG_SINGLETHREAD  1  /* nil */
#define SQLITE_CONFIG_MULTITHREAD   2  /* nil */
#define SQLITE_CONFIG_SERIALIZED    3  /* nil */
................................................................................
** </dd>
**
** [[SQLITE_DBSTATUS_CACHE_MISS]] ^(<dt>SQLITE_DBSTATUS_CACHE_MISS</dt>
** <dd>This parameter returns the number of pager cache misses that have
** occurred.)^ ^The highwater mark associated with SQLITE_DBSTATUS_CACHE_MISS 
** is always 0.
** </dd>
**
** [[SQLITE_DBSTATUS_CACHE_WRITE]] ^(<dt>SQLITE_DBSTATUS_CACHE_WRITE</dt>
** <dd>This parameter returns the number of dirty cache entries that have
** been written to disk. Specifically, the number of pages written to the
** wal file in wal mode databases, or the number of pages written to the
** database file in rollback mode databases. Any pages written as part of
** transaction rollback or database recovery operations are not included.
** If an IO or other error occurs while writing a page to disk, the effect
** on subsequent SQLITE_DBSTATUS_CACHE_WRITE requests is undefined.)^ ^The
** highwater mark associated with SQLITE_DBSTATUS_CACHE_WRITE is always 0.
** </dd>
** </dl>
*/
#define SQLITE_DBSTATUS_LOOKASIDE_USED       0
#define SQLITE_DBSTATUS_CACHE_USED           1
#define SQLITE_DBSTATUS_SCHEMA_USED          2
#define SQLITE_DBSTATUS_STMT_USED            3
#define SQLITE_DBSTATUS_LOOKASIDE_HIT        4
#define SQLITE_DBSTATUS_LOOKASIDE_MISS_SIZE  5
#define SQLITE_DBSTATUS_LOOKASIDE_MISS_FULL  6
#define SQLITE_DBSTATUS_CACHE_HIT            7
#define SQLITE_DBSTATUS_CACHE_MISS           8
#define SQLITE_DBSTATUS_CACHE_WRITE          9
#define SQLITE_DBSTATUS_MAX                  9   /* Largest defined DBSTATUS */


/*
** CAPI3REF: Prepared Statement Status
**
** ^(Each prepared statement maintains various
** [SQLITE_STMTSTATUS counters] that measure the number
................................................................................
** R-Tree geometry query as follows:
**
**   SELECT ... FROM <rtree> WHERE <rtree col> MATCH $zGeom(... params ...)
*/
SQLITE_API int sqlite3_rtree_geometry_callback(
  sqlite3 *db,
  const char *zGeom,
#ifdef SQLITE_RTREE_INT_ONLY
  int (*xGeom)(sqlite3_rtree_geometry*, int n, sqlite3_int64 *a, int *pRes),
#else
  int (*xGeom)(sqlite3_rtree_geometry*, int n, double *a, int *pRes),
#endif
  void *pContext
);


/*
** A pointer to a structure of the following type is passed as the first
** argument to callbacks registered using rtree_geometry_callback().