pParse->nTab = 0;
  pParse->nMem = 0;
  pParse->nSet = 0;
  pParse->nVar = 0;
  pParse->cookieMask = 0;
  pParse->cookieGoto = 0;
}


















/*
** Run the parser and code generator recursively in order to generate
** code for the SQL statement given onto the end of the pParse context
** currently under construction.  When the parser is run recursively
** this way, the final OP_Halt is not appended and other initialization
** and finalization steps are omitted because those are handling by the
................................................................................

#ifndef SQLITE_OMIT_VIRTUALTABLE
    if( isVirtual ){
      sqlite4VdbeAddOp0(v, OP_VBegin);
    }
#endif


    /* This just creates a place-holder record in the sqlite_master table.
    ** The record created does not contain anything yet.  It will be replaced
    ** by the real entry in code generated at sqlite4EndTable().
    **
    ** The rowid for the new entry is left in register pParse->regRowid.
    ** The root page number of the new table is left in reg pParse->regRoot.
    ** The rowid and root page number values are needed by the code that
................................................................................
    reg3 = ++pParse->nMem;
#if !defined(SQLITE_OMIT_VIEW) || !defined(SQLITE_OMIT_VIRTUALTABLE)
    if( isView || isVirtual ){
      sqlite4VdbeAddOp2(v, OP_Integer, 0, reg2);
    }else
#endif
    {

      sqlite4VdbeAddOp2(v, OP_CreateTable, iDb, reg2);
    }
    sqlite4OpenMasterTable(pParse, iDb);
    sqlite4VdbeAddOp2(v, OP_NewRowid, 0, reg1);
    sqlite4VdbeAddOp2(v, OP_Null, 0, reg3);
    sqlite4VdbeAddOp3(v, OP_Insert, 0, reg3, reg1);
    sqlite4VdbeChangeP5(v, OPFLAG_APPEND);
    sqlite4VdbeAddOp0(v, OP_Close);
................................................................................
#endif
}

/*
** Generate code that will erase and refill index *pIdx.  This is
** used to initialize a newly created index or to recompute the
** content of an index in response to a REINDEX command.
**
** if memRootPage is not negative, it means that the index is newly
** created.  The register specified by memRootPage contains the
** root page number of the index.  If memRootPage is negative, then
** the index already exists and must be cleared before being refilled and
** the root page number of the index is taken from pIndex->tnum.
*/
static void sqlite4RefillIndex(Parse *pParse, Index *pIndex, int memRootPage){
  Table *pTab = pIndex->pTable;  /* The table that is indexed */
  int iTab = pParse->nTab++;     /* Cursor used for pTab */
  int iIdx = pParse->nTab++;     /* Cursor used for pIndex */
  int iSorter;                   /* Cursor opened by OpenSorter (if in use) */
  int addr1;                     /* Address of top of loop */
  int addr2;                     /* Address to jump to for next iteration */
  int tnum;                      /* Root page of index */
................................................................................
#endif

  /* Require a write-lock on the table to perform this operation */
  sqlite4TableLock(pParse, iDb, pTab->tnum, 1, pTab->zName);

  v = sqlite4GetVdbe(pParse);
  if( v==0 ) return;
  if( memRootPage>=0 ){
    tnum = memRootPage;
  }else{
    tnum = pIndex->tnum;
    sqlite4VdbeAddOp2(v, OP_Clear, tnum, iDb);
  }
  pKey = sqlite4IndexKeyinfo(pParse, pIndex);
  sqlite4VdbeAddOp4(v, OP_OpenWrite, iIdx, tnum, iDb, 
                    (char *)pKey, P4_KEYINFO_HANDOFF);
  if( memRootPage>=0 ){
    sqlite4VdbeChangeP5(v, 1);
  }

#ifndef SQLITE_OMIT_MERGE_SORT
  /* Open the sorter cursor if we are to use one. */
  iSorter = pParse->nTab++;
  sqlite4VdbeAddOp4(v, OP_SorterOpen, iSorter, 0, 0, (char*)pKey, P4_KEYINFO);
#else
  iSorter = iTab;
................................................................................
  ** or UNIQUE constraint of a CREATE TABLE statement.  Since the table
  ** has just been created, it contains no data and the index initialization
  ** step can be skipped.
  */
  else{ /* if( db->init.busy==0 ) */
    Vdbe *v;
    char *zStmt;
    int iMem = ++pParse->nMem;

    v = sqlite4GetVdbe(pParse);
    if( v==0 ) goto exit_create_index;


    /* Create the rootpage for the index
    */
    sqlite4BeginWriteOperation(pParse, 1, iDb);
    sqlite4VdbeAddOp2(v, OP_CreateIndex, iDb, iMem);

    /* Gather the complete text of the CREATE INDEX statement into
    ** the zStmt variable
    */
    if( pStart ){
      assert( pEnd!=0 );
      /* A named index with an explicit CREATE INDEX statement */
................................................................................
      /* zStmt = sqlite4MPrintf(""); */
      zStmt = 0;
    }

    /* Add an entry in sqlite_master for this index
    */
    sqlite4NestedParse(pParse, 
        "INSERT INTO %Q.%s VALUES('index',%Q,%Q,#%d,%Q);",
        db->aDb[iDb].zName, SCHEMA_TABLE(iDb),
        pIndex->zName,
        pTab->zName,
        iMem,
        zStmt
    );
    sqlite4DbFree(db, zStmt);

    /* Fill the index with data and reparse the schema. Code an OP_Expire
    ** to invalidate all pre-compiled statements.
    */
    if( pTblName ){
      sqlite4RefillIndex(pParse, pIndex, iMem);
      sqlite4ChangeCookie(pParse, iDb);
      sqlite4VdbeAddParseSchemaOp(v, iDb,
         sqlite4MPrintf(db, "name='%q' AND type='index'", pIndex->zName));
      sqlite4VdbeAddOp1(v, OP_Expire, 0);
    }
  }

................................................................................
static void reindexTable(Parse *pParse, Table *pTab, char const *zColl){
  Index *pIndex;              /* An index associated with pTab */

  for(pIndex=pTab->pIndex; pIndex; pIndex=pIndex->pNext){
    if( zColl==0 || collationMatch(zColl, pIndex) ){
      int iDb = sqlite4SchemaToIndex(pParse->db, pTab->pSchema);
      sqlite4BeginWriteOperation(pParse, 0, iDb);
      sqlite4RefillIndex(pParse, pIndex, -1);
    }
  }
}
#endif

/*
** Recompute all indices of all tables in all databases where the
................................................................................
    sqlite4DbFree(db, z);
    return;
  }
  pIndex = sqlite4FindIndex(db, z, zDb);
  sqlite4DbFree(db, z);
  if( pIndex ){
    sqlite4BeginWriteOperation(pParse, 0, iDb);
    sqlite4RefillIndex(pParse, pIndex, -1);
    return;
  }
  sqlite4ErrorMsg(pParse, "unable to identify the object to be reindexed");
}
#endif

/*

  pParse->nTab = 0;
  pParse->nMem = 0;
  pParse->nSet = 0;
  pParse->nVar = 0;
  pParse->cookieMask = 0;
  pParse->cookieGoto = 0;
}

/*
** Find an available table number for database iDb
*/
static int firstAvailableTableNumber(sqlite4 *db, int iDb){
  HashElem *i;
  int maxTab = 1;
  for(i=sqliteHashFirst(&db->aDb[iDb].pSchema->tblHash); i;i=sqliteHashNext(i)){
    Table *pTab = (Table*)sqliteHashData(i);
    if( pTab->tnum > maxTab ) maxTab = pTab->tnum;
  }
  for(i=sqliteHashFirst(&db->aDb[iDb].pSchema->idxHash); i;i=sqliteHashNext(i)){
    Index *pIdx = (Index*)sqliteHashData(i);
    if( pIdx->tnum > maxTab ) maxTab = pIdx->tnum;
  }
  return maxTab+1;
}

/*
** Run the parser and code generator recursively in order to generate
** code for the SQL statement given onto the end of the pParse context
** currently under construction.  When the parser is run recursively
** this way, the final OP_Halt is not appended and other initialization
** and finalization steps are omitted because those are handling by the
................................................................................

#ifndef SQLITE_OMIT_VIRTUALTABLE
    if( isVirtual ){
      sqlite4VdbeAddOp0(v, OP_VBegin);
    }
#endif


    /* This just creates a place-holder record in the sqlite_master table.
    ** The record created does not contain anything yet.  It will be replaced
    ** by the real entry in code generated at sqlite4EndTable().
    **
    ** The rowid for the new entry is left in register pParse->regRowid.
    ** The root page number of the new table is left in reg pParse->regRoot.
    ** The rowid and root page number values are needed by the code that
................................................................................
    reg3 = ++pParse->nMem;
#if !defined(SQLITE_OMIT_VIEW) || !defined(SQLITE_OMIT_VIRTUALTABLE)
    if( isView || isVirtual ){
      sqlite4VdbeAddOp2(v, OP_Integer, 0, reg2);
    }else
#endif
    {
      int tnum = firstAvailableTableNumber(db, iDb);
      sqlite4VdbeAddOp2(v, OP_Integer, tnum, reg2);
    }
    sqlite4OpenMasterTable(pParse, iDb);
    sqlite4VdbeAddOp2(v, OP_NewRowid, 0, reg1);
    sqlite4VdbeAddOp2(v, OP_Null, 0, reg3);
    sqlite4VdbeAddOp3(v, OP_Insert, 0, reg3, reg1);
    sqlite4VdbeChangeP5(v, OPFLAG_APPEND);
    sqlite4VdbeAddOp0(v, OP_Close);
................................................................................
#endif
}

/*
** Generate code that will erase and refill index *pIdx.  This is
** used to initialize a newly created index or to recompute the
** content of an index in response to a REINDEX command.






*/
static void sqlite4RefillIndex(Parse *pParse, Index *pIndex){
  Table *pTab = pIndex->pTable;  /* The table that is indexed */
  int iTab = pParse->nTab++;     /* Cursor used for pTab */
  int iIdx = pParse->nTab++;     /* Cursor used for pIndex */
  int iSorter;                   /* Cursor opened by OpenSorter (if in use) */
  int addr1;                     /* Address of top of loop */
  int addr2;                     /* Address to jump to for next iteration */
  int tnum;                      /* Root page of index */
................................................................................
#endif

  /* Require a write-lock on the table to perform this operation */
  sqlite4TableLock(pParse, iDb, pTab->tnum, 1, pTab->zName);

  v = sqlite4GetVdbe(pParse);
  if( v==0 ) return;



  tnum = pIndex->tnum;
  sqlite4VdbeAddOp2(v, OP_Clear, tnum, iDb);

  pKey = sqlite4IndexKeyinfo(pParse, pIndex);
  sqlite4VdbeAddOp4(v, OP_OpenWrite, iIdx, tnum, iDb, 
                    (char *)pKey, P4_KEYINFO_HANDOFF);




#ifndef SQLITE_OMIT_MERGE_SORT
  /* Open the sorter cursor if we are to use one. */
  iSorter = pParse->nTab++;
  sqlite4VdbeAddOp4(v, OP_SorterOpen, iSorter, 0, 0, (char*)pKey, P4_KEYINFO);
#else
  iSorter = iTab;
................................................................................
  ** or UNIQUE constraint of a CREATE TABLE statement.  Since the table
  ** has just been created, it contains no data and the index initialization
  ** step can be skipped.
  */
  else{ /* if( db->init.busy==0 ) */
    Vdbe *v;
    char *zStmt;


    v = sqlite4GetVdbe(pParse);
    if( v==0 ) goto exit_create_index;


    /* Create the rootpage for the index
    */
    sqlite4BeginWriteOperation(pParse, 1, iDb);
    pIndex->tnum = firstAvailableTableNumber(db, iDb);

    /* Gather the complete text of the CREATE INDEX statement into
    ** the zStmt variable
    */
    if( pStart ){
      assert( pEnd!=0 );
      /* A named index with an explicit CREATE INDEX statement */
................................................................................
      /* zStmt = sqlite4MPrintf(""); */
      zStmt = 0;
    }

    /* Add an entry in sqlite_master for this index
    */
    sqlite4NestedParse(pParse, 
        "INSERT INTO %Q.%s VALUES('index',%Q,%Q,%d,%Q);",
        db->aDb[iDb].zName, SCHEMA_TABLE(iDb),
        pIndex->zName,
        pTab->zName,
        pIndex->tnum,
        zStmt
    );
    sqlite4DbFree(db, zStmt);

    /* Fill the index with data and reparse the schema. Code an OP_Expire
    ** to invalidate all pre-compiled statements.
    */
    if( pTblName ){
      sqlite4RefillIndex(pParse, pIndex);
      sqlite4ChangeCookie(pParse, iDb);
      sqlite4VdbeAddParseSchemaOp(v, iDb,
         sqlite4MPrintf(db, "name='%q' AND type='index'", pIndex->zName));
      sqlite4VdbeAddOp1(v, OP_Expire, 0);
    }
  }

................................................................................
static void reindexTable(Parse *pParse, Table *pTab, char const *zColl){
  Index *pIndex;              /* An index associated with pTab */

  for(pIndex=pTab->pIndex; pIndex; pIndex=pIndex->pNext){
    if( zColl==0 || collationMatch(zColl, pIndex) ){
      int iDb = sqlite4SchemaToIndex(pParse->db, pTab->pSchema);
      sqlite4BeginWriteOperation(pParse, 0, iDb);
      sqlite4RefillIndex(pParse, pIndex);
    }
  }
}
#endif

/*
** Recompute all indices of all tables in all databases where the
................................................................................
    sqlite4DbFree(db, z);
    return;
  }
  pIndex = sqlite4FindIndex(db, z, zDb);
  sqlite4DbFree(db, z);
  if( pIndex ){
    sqlite4BeginWriteOperation(pParse, 0, iDb);
    sqlite4RefillIndex(pParse, pIndex);
    return;
  }
  sqlite4ErrorMsg(pParse, "unable to identify the object to be reindexed");
}
#endif

/*

** See also: Destroy
*/
case OP_Clear: {
  assert( 0 );
  break;
}

/* Opcode: CreateTable P1 P2 * * *
**
** Allocate a new table in the main database file if P1==0 or in the
** auxiliary database file if P1==1 or in an attached database if
** P1>1.  Write the root page number of the new table into
** register P2
**
** The difference between a table and an index is this:  A table must
** have a 4-byte integer key and can have arbitrary data.  An index
** has an arbitrary key but no data.
**
** See also: CreateIndex
*/
/* Opcode: CreateIndex P1 P2 * * *
**
** Allocate a new index in the main database file if P1==0 or in the
** auxiliary database file if P1==1 or in an attached database if
** P1>1.  Write the root page number of the new table into
** register P2.
**
** See documentation on OP_CreateTable for additional information.
*/
case OP_CreateIndex:            /* out2-prerelease */
case OP_CreateTable: {          /* out2-prerelease */
  sqlite4_uint64 iTabno;
  Db *pDb;
  KVCursor *pCur;
  const KVByteArray *aKey;
  KVSize nKey;
  int n;
  KVByteArray aProbe[12];

  iTabno = 0;
  assert( pOp->p1>=0 && pOp->p1<db->nDb );
  pDb = &db->aDb[pOp->p1];
  memset(aProbe, 0xff, 9);
  rc = sqlite4KVStoreOpenCursor(pDb->pKV, &pCur);
  if( rc ) break;
  rc = sqlite4KVCursorSeek(pCur, aProbe, 9, -1);
  if( rc==SQLITE_OK ){
    sqlite4KVCursorClose(pCur);
    rc = SQLITE_CORRUPT;
    break;
  }
  if( rc==SQLITE_NOTFOUND ){
    iTabno = 2;
    n = 1;
    rc = SQLITE_OK;
  }else if( rc==SQLITE_INEXACT ){
    rc = sqlite4KVCursorKey(pCur, &aKey, &nKey);
    n = sqlite4GetVarint64(aKey, nKey, &iTabno);
  }else{
    break;
  }
  sqlite4KVCursorClose(pCur);
  if( n==0 ){
    rc = SQLITE_CORRUPT;
  }
  pOut->u.i = iTabno;
  break;
}

/* Opcode: ParseSchema P1 * * P4 *
**
** Read and parse all entries from the SQLITE_MASTER table of database P1
** that match the WHERE clause P4. 
**
** This opcode invokes the parser to create a new virtual machine,

** See also: Destroy
*/
case OP_Clear: {
  assert( 0 );
  break;
}































































/* Opcode: ParseSchema P1 * * P4 *
**
** Read and parse all entries from the SQLITE_MASTER table of database P1
** that match the WHERE clause P4. 
**
** This opcode invokes the parser to create a new virtual machine,