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Overview
Comment:Fix for compound EXCEPT queries.
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SHA1: 2dc7b223393f1b8a84d657dfc54f8aaede7a5e4a
User & Date: dan 2012-04-23 09:40:36.679
Context
2012-04-23
11:45
Fix a bug in CREATE INDEX where the number of columns in the index is fewer than the number of columns in the primary key. check-in: b0ac144cf5 user: drh tags: trunk
09:40
Fix for compound EXCEPT queries. check-in: 2dc7b22339 user: dan tags: trunk
2012-04-21
19:59
Additional comments on the key encoder. Remove an unused variable. check-in: fdaed18ddf user: drh tags: trunk
Changes
Unified Diff Ignore Whitespace Patch
Changes to src/select.c.
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      sqlite4VdbeAddOp3(v, OP_MakeRecord, regResult, nColumn, r1);
      sqlite4VdbeAddOp3(v, OP_IdxInsert, iParm, r1, r2);
      sqlite4ReleaseTempReg(pParse, r1);
      sqlite4ReleaseTempReg(pParse, r2);
      break;
    }

    /* Construct a record from the query result, but instead of
    ** saving that record, use it as a key to delete elements from
    ** the temporary table iParm.
    */



    case SRT_Except: {


      sqlite4VdbeAddOp3(v, OP_IdxDelete, iParm, regResult, nColumn);

      break;
    }
#endif

    /* Store the result as data using a unique key.
    */
    case SRT_Table:








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      sqlite4VdbeAddOp3(v, OP_MakeRecord, regResult, nColumn, r1);
      sqlite4VdbeAddOp3(v, OP_IdxInsert, iParm, r1, r2);
      sqlite4ReleaseTempReg(pParse, r1);
      sqlite4ReleaseTempReg(pParse, r2);
      break;
    }

    /* This is used for processing queries of the form:
    **
    **     <select-1> EXCEPT <select-2>
    **
    ** Temporary index iParm contains the results of <select-1>. This
    ** code is processing the results of <select-2>. For each row of
    ** <select-2>, remove any identical row from iParm.  */
    case SRT_Except: {
      int regKey = sqlite4GetTempReg(pParse);
      sqlite4VdbeAddOp4Int(v, OP_MakeIdxKey, iParm, regResult, regKey, 0);
      sqlite4VdbeAddOp3(v, OP_IdxDelete, iParm, 0, regKey);
      sqlite4ReleaseTempReg(pParse, regKey);
      break;
    }
#endif

    /* Store the result as data using a unique key.
    */
    case SRT_Table:
︙︙
Changes to src/vdbe.c.
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  break;
}

/* Opcode: IdxDelete P1 * P3 * *
**
** P1 is a cursor open on a database index. P3 contains a key suitable for
** the index. Delete P3 from P1.
*/
case OP_IdxDelete: {

















  break;
}

/* Opcode: IdxRowid P1 P2 * * *
**
** Write into register P2 an integer which is the last entry in the record at
** the end of the index key pointed to by cursor P1.  This integer should be








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  break;
}

/* Opcode: IdxDelete P1 * P3 * *
**
** P1 is a cursor open on a database index. P3 contains a key suitable for
** the index. Delete P3 from P1 if it is present.
*/
case OP_IdxDelete: {
  VdbeCursor *pC;
  Mem *pKey;

  pC = p->apCsr[pOp->p1];
  pKey = &aMem[pOp->p3];

  assert( pOp->p1>=0 && pOp->p1<p->nCursor );
  assert( pC && pC->pKVCur && pC->pKVCur->pStore );
  assert( pKey->flags & MEM_Blob );

  rc = sqlite4KVCursorSeek(pC->pKVCur, pKey->z, pKey->n, 0);
  if( rc==SQLITE_OK ){
    rc = sqlite4KVCursorDelete(pC->pKVCur);
  }else if( rc==SQLITE_NOTFOUND ){
    rc = SQLITE_OK;
  }

  break;
}

/* Opcode: IdxRowid P1 P2 * * *
**
** Write into register P2 an integer which is the last entry in the record at
** the end of the index key pointed to by cursor P1.  This integer should be
︙︙
Changes to test/simple.test.
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do_execsql_test 44.3 {
  SELECT y FROM t1 ORDER BY y;
} [lsort -real $lVal]
do_execsql_test 44.4 {
  SELECT count(*) FROM t1;
} {60}

























finish_test









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do_execsql_test 44.3 {
  SELECT y FROM t1 ORDER BY y;
} [lsort -real $lVal]
do_execsql_test 44.4 {
  SELECT count(*) FROM t1;
} {60}

#-------------------------------------------------------------------------
reset_db

do_execsql_test 45.1 {
  CREATE TABLE t1(a, b, c);
  CREATE TABLE t2(d, e, f);

  INSERT INTO t2 VALUES(3,   6,  9);
  INSERT INTO t2 VALUES(12, 15, 18);
  INSERT INTO t2 VALUES(21, 24, 27);
}

do_execsql_test 45.2 {
  SELECT d FROM t2 EXCEPT SELECT d FROM t2;
} {}

do_execsql_test 45.3 {
  SELECT d FROM t2 
  EXCEPT 
  SELECT a FROM (SELECT a FROM t1 UNION ALL SELECT d FROM t2)
} {}



finish_test