if( pList ) pParse->iPkSortOrder = pList->a[0].sortOrder;
  }else if( autoInc ){
#ifndef SQLITE_OMIT_AUTOINCREMENT
    sqlite3ErrorMsg(pParse, "AUTOINCREMENT is only allowed on an "
       "INTEGER PRIMARY KEY");
#endif
  }else{
    Vdbe *v = pParse->pVdbe;
    Index *p;
    if( v ) pParse->addrSkipPK = sqlite3VdbeAddOp0(v, OP_Noop);
    p = sqlite3CreateIndex(pParse, 0, 0, 0, pList, onError, 0,
                           0, sortOrder, 0);
    if( p ){
      p->idxType = SQLITE_IDXTYPE_PRIMARYKEY;
      if( v ) sqlite3VdbeJumpHere(v, pParse->addrSkipPK);
    }
    pList = 0;
  }

primary_key_exit:
  sqlite3ExprListDelete(pParse->db, pList);
  return;
................................................................................
  ** created will become the PRIMARY KEY index.
  */
  if( pParse->addrCrTab ){
    assert( v );
    sqlite3VdbeGetOp(v, pParse->addrCrTab)->opcode = OP_CreateIndex;
  }

  /* Bypass the creation of the PRIMARY KEY btree and the sqlite_master
  ** table entry.
  */
  if( pParse->addrSkipPK ){
    assert( v );
    sqlite3VdbeGetOp(v, pParse->addrSkipPK)->opcode = OP_Goto;
  }

  /* Locate the PRIMARY KEY index.  Or, if this table was originally
  ** an INTEGER PRIMARY KEY table, create a new PRIMARY KEY index. 
  */
  if( pTab->iPKey>=0 ){
    ExprList *pList;
    pList = sqlite3ExprListAppend(pParse, 0, 0);
    if( pList==0 ) return;
................................................................................
    assert( pParse->pNewTable==pTab );
    pPk = sqlite3CreateIndex(pParse, 0, 0, 0, pList, pTab->keyConf, 0, 0, 0, 0);
    if( pPk==0 ) return;
    pPk->idxType = SQLITE_IDXTYPE_PRIMARYKEY;
    pTab->iPKey = -1;
  }else{
    pPk = sqlite3PrimaryKeyIndex(pTab);










    /*
    ** Remove all redundant columns from the PRIMARY KEY.  For example, change
    ** "PRIMARY KEY(a,b,a,b,c,b,c,d)" into just "PRIMARY KEY(a,b,c,d)".  Later
    ** code assumes the PRIMARY KEY contains no repeated columns.
    */
    for(i=j=1; i<pPk->nKeyCol; i++){
      if( hasColumn(pPk->aiColumn, j, pPk->aiColumn[i]) ){
................................................................................
    Vdbe *v;
    char *zStmt;
    int iMem = ++pParse->nMem;

    v = sqlite3GetVdbe(pParse);
    if( v==0 ) goto exit_create_index;



    /* Create the rootpage for the index
    */
    sqlite3BeginWriteOperation(pParse, 1, iDb);





    sqlite3VdbeAddOp2(v, OP_CreateIndex, iDb, iMem);

    /* Gather the complete text of the CREATE INDEX statement into
    ** the zStmt variable
    */
    if( pStart ){
      int n = (int)(pParse->sLastToken.z - pName->z) + pParse->sLastToken.n;
................................................................................
    if( pTblName ){
      sqlite3RefillIndex(pParse, pIndex, iMem);
      sqlite3ChangeCookie(pParse, iDb);
      sqlite3VdbeAddParseSchemaOp(v, iDb,
         sqlite3MPrintf(db, "name='%q' AND type='index'", pIndex->zName));
      sqlite3VdbeAddOp1(v, OP_Expire, 0);
    }


  }

  /* When adding an index to the list of indices for a table, make
  ** sure all indices labeled OE_Replace come after all those labeled
  ** OE_Ignore.  This is necessary for the correct constraint check
  ** processing (in sqlite3GenerateConstraintChecks()) as part of
  ** UPDATE and INSERT statements.  

    if( pList ) pParse->iPkSortOrder = pList->a[0].sortOrder;
  }else if( autoInc ){
#ifndef SQLITE_OMIT_AUTOINCREMENT
    sqlite3ErrorMsg(pParse, "AUTOINCREMENT is only allowed on an "
       "INTEGER PRIMARY KEY");
#endif
  }else{

    Index *p;

    p = sqlite3CreateIndex(pParse, 0, 0, 0, pList, onError, 0,
                           0, sortOrder, 0);
    if( p ){
      p->idxType = SQLITE_IDXTYPE_PRIMARYKEY;

    }
    pList = 0;
  }

primary_key_exit:
  sqlite3ExprListDelete(pParse->db, pList);
  return;
................................................................................
  ** created will become the PRIMARY KEY index.
  */
  if( pParse->addrCrTab ){
    assert( v );
    sqlite3VdbeGetOp(v, pParse->addrCrTab)->opcode = OP_CreateIndex;
  }









  /* Locate the PRIMARY KEY index.  Or, if this table was originally
  ** an INTEGER PRIMARY KEY table, create a new PRIMARY KEY index. 
  */
  if( pTab->iPKey>=0 ){
    ExprList *pList;
    pList = sqlite3ExprListAppend(pParse, 0, 0);
    if( pList==0 ) return;
................................................................................
    assert( pParse->pNewTable==pTab );
    pPk = sqlite3CreateIndex(pParse, 0, 0, 0, pList, pTab->keyConf, 0, 0, 0, 0);
    if( pPk==0 ) return;
    pPk->idxType = SQLITE_IDXTYPE_PRIMARYKEY;
    pTab->iPKey = -1;
  }else{
    pPk = sqlite3PrimaryKeyIndex(pTab);

    /* Bypass the creation of the PRIMARY KEY btree and the sqlite_master
    ** table entry. This is only required if currently generating VDBE
    ** code for a CREATE TABLE (not when parsing one as part of reading
    ** a database schema).  */
    if( v ){
      assert( db->init.busy==0 );
      sqlite3VdbeGetOp(v, pPk->tnum)->opcode = OP_Goto;
    }

    /*
    ** Remove all redundant columns from the PRIMARY KEY.  For example, change
    ** "PRIMARY KEY(a,b,a,b,c,b,c,d)" into just "PRIMARY KEY(a,b,c,d)".  Later
    ** code assumes the PRIMARY KEY contains no repeated columns.
    */
    for(i=j=1; i<pPk->nKeyCol; i++){
      if( hasColumn(pPk->aiColumn, j, pPk->aiColumn[i]) ){
................................................................................
    Vdbe *v;
    char *zStmt;
    int iMem = ++pParse->nMem;

    v = sqlite3GetVdbe(pParse);
    if( v==0 ) goto exit_create_index;

    sqlite3BeginWriteOperation(pParse, 1, iDb);

    /* Create the rootpage for the index using CreateIndex. But before

    ** doing so, code a Noop instruction and store its address in 
    ** Index.tnum. This is required in case this index is actually a 
    ** PRIMARY KEY and the table is actually a WITHOUT ROWID table. In 
    ** that case the convertToWithoutRowidTable() routine will replace
    ** the Noop with a Goto to jump over the VDBE code generated below. */
    pIndex->tnum = sqlite3VdbeAddOp0(v, OP_Noop);
    sqlite3VdbeAddOp2(v, OP_CreateIndex, iDb, iMem);

    /* Gather the complete text of the CREATE INDEX statement into
    ** the zStmt variable
    */
    if( pStart ){
      int n = (int)(pParse->sLastToken.z - pName->z) + pParse->sLastToken.n;
................................................................................
    if( pTblName ){
      sqlite3RefillIndex(pParse, pIndex, iMem);
      sqlite3ChangeCookie(pParse, iDb);
      sqlite3VdbeAddParseSchemaOp(v, iDb,
         sqlite3MPrintf(db, "name='%q' AND type='index'", pIndex->zName));
      sqlite3VdbeAddOp1(v, OP_Expire, 0);
    }

    sqlite3VdbeJumpHere(v, pIndex->tnum);
  }

  /* When adding an index to the list of indices for a table, make
  ** sure all indices labeled OE_Replace come after all those labeled
  ** OE_Ignore.  This is necessary for the correct constraint check
  ** processing (in sqlite3GenerateConstraintChecks()) as part of
  ** UPDATE and INSERT statements.  

**
** The Index.onError field determines whether or not the indexed columns
** must be unique and what to do if they are not.  When Index.onError=OE_None,
** it means this is not a unique index.  Otherwise it is a unique index
** and the value of Index.onError indicate the which conflict resolution 
** algorithm to employ whenever an attempt is made to insert a non-unique
** element.








*/
struct Index {
  char *zName;             /* Name of this index */
  i16 *aiColumn;           /* Which columns are used by this index.  1st is 0 */
  LogEst *aiRowLogEst;     /* From ANALYZE: Est. rows selected by each column */
  Table *pTable;           /* The SQL table being indexed */
  char *zColAff;           /* String defining the affinity of each column */
................................................................................
#endif
  AutoincInfo *pAinc;  /* Information about AUTOINCREMENT counters */

  /* Information used while coding trigger programs. */
  Parse *pToplevel;    /* Parse structure for main program (or NULL) */
  Table *pTriggerTab;  /* Table triggers are being coded for */
  int addrCrTab;       /* Address of OP_CreateTable opcode on CREATE TABLE */
  int addrSkipPK;      /* Address of instruction to skip PRIMARY KEY index */
  u32 nQueryLoop;      /* Est number of iterations of a query (10*log2(N)) */
  u32 oldmask;         /* Mask of old.* columns referenced */
  u32 newmask;         /* Mask of new.* columns referenced */
  u8 eTriggerOp;       /* TK_UPDATE, TK_INSERT or TK_DELETE */
  u8 eOrconf;          /* Default ON CONFLICT policy for trigger steps */
  u8 disableTriggers;  /* True to disable triggers */

**
** The Index.onError field determines whether or not the indexed columns
** must be unique and what to do if they are not.  When Index.onError=OE_None,
** it means this is not a unique index.  Otherwise it is a unique index
** and the value of Index.onError indicate the which conflict resolution 
** algorithm to employ whenever an attempt is made to insert a non-unique
** element.
**
** While parsing a CREATE TABLE or CREATE INDEX statement in order to
** generate VDBE code (as opposed to parsing one read from an sqlite_master
** table as part of parsing an existing database schema), transient instances
** of this structure may be created. In this case the Index.tnum variable is
** used to store the address of a VDBE instruction, not a database page
** number (it cannot - the database page is not allocated until the VDBE
** program is executed). See convertToWithoutRowidTable() for details.
*/
struct Index {
  char *zName;             /* Name of this index */
  i16 *aiColumn;           /* Which columns are used by this index.  1st is 0 */
  LogEst *aiRowLogEst;     /* From ANALYZE: Est. rows selected by each column */
  Table *pTable;           /* The SQL table being indexed */
  char *zColAff;           /* String defining the affinity of each column */
................................................................................
#endif
  AutoincInfo *pAinc;  /* Information about AUTOINCREMENT counters */

  /* Information used while coding trigger programs. */
  Parse *pToplevel;    /* Parse structure for main program (or NULL) */
  Table *pTriggerTab;  /* Table triggers are being coded for */
  int addrCrTab;       /* Address of OP_CreateTable opcode on CREATE TABLE */

  u32 nQueryLoop;      /* Est number of iterations of a query (10*log2(N)) */
  u32 oldmask;         /* Mask of old.* columns referenced */
  u32 newmask;         /* Mask of new.* columns referenced */
  u8 eTriggerOp;       /* TK_UPDATE, TK_INSERT or TK_DELETE */
  u8 eOrconf;          /* Default ON CONFLICT policy for trigger steps */
  u8 disableTriggers;  /* True to disable triggers */

  CREATE INDEX i46 ON t46(c);
}

foreach {tn cnt where eqp} $queries {
  do_execsql_test 5.7.$tn.1 "SELECT count(*) FROM t46 WHERE $where" $cnt
  do_eqp_test 5.7.$tn.2  "SELECT count(*) FROM t46 WHERE $where" $eqp
}



  






























finish_test

  CREATE INDEX i46 ON t46(c);
}

foreach {tn cnt where eqp} $queries {
  do_execsql_test 5.7.$tn.1 "SELECT count(*) FROM t46 WHERE $where" $cnt
  do_eqp_test 5.7.$tn.2  "SELECT count(*) FROM t46 WHERE $where" $eqp
}

#-------------------------------------------------------------------------
# Check that redundant UNIQUE constraints do not cause a problem.
#
do_execsql_test 6.0 {
  CREATE TABLE t47(a, b UNIQUE PRIMARY KEY) WITHOUT ROWID;
  CREATE INDEX i47 ON t47(a);
  INSERT INTO t47 VALUES(1, 2);
  INSERT INTO t47 VALUES(2, 4);
  INSERT INTO t47 VALUES(3, 6);
  INSERT INTO t47 VALUES(4, 8);

  VACUUM;
  PRAGMA integrity_check;
  SELECT name FROM sqlite_master WHERE tbl_name = 't47';
} {ok t47 i47}

do_execsql_test 6.1 {
  CREATE TABLE t48(
    a UNIQUE UNIQUE, 
    b UNIQUE, 
    PRIMARY KEY(a), 
    UNIQUE(a)
  ) WITHOUT ROWID;
  INSERT INTO t48 VALUES('a', 'b'), ('c', 'd'), ('e', 'f');
  VACUUM;
  PRAGMA integrity_check;
  SELECT name FROM sqlite_master WHERE tbl_name = 't48';
} {
  ok  t48   sqlite_autoindex_t48_2
}


  
finish_test