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Overview
Comment:Fix a faulty assert() in the merge implementation of the UNION operator. Ticket #3467. (CVS 5852)
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SHA1: cd1662e964d9c071a41038676c5a6ef2c990f1ac
User & Date: drh 2008-10-30 22:13:23
Context
2008-10-31
10:53
Change the way sqlite3VdbeSetColName() is called so as to remove a few lines of code. This also fixes #3470. (CVS 5853) check-in: bfce9142 user: danielk1977 tags: trunk
2008-10-30
22:13
Fix a faulty assert() in the merge implementation of the UNION operator. Ticket #3467. (CVS 5852) check-in: cd1662e9 user: drh tags: trunk
17:21
Fix a crash that can follow a malloc failure in sqlite3ValueFromExpr(). Ticket #3468. (CVS 5851) check-in: 0996783b user: danielk1977 tags: trunk
Changes
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Changes to src/select.c.

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**    May you find forgiveness for yourself and forgive others.
**    May you share freely, never taking more than you give.
**
*************************************************************************
** This file contains C code routines that are called by the parser
** to handle SELECT statements in SQLite.
**
** $Id: select.c,v 1.480 2008/10/07 19:53:14 drh Exp $
*/
#include "sqliteInt.h"


/*
** Delete all the content of a Select structure but do not deallocate
** the select structure itself.
................................................................................
  ** for the logic that removes duplicate result rows when the
  ** operator is UNION, EXCEPT, or INTERSECT (but not UNION ALL).
  */
  if( op==TK_ALL ){
    regPrev = 0;
  }else{
    int nExpr = p->pEList->nExpr;
    assert( nOrderBy>=nExpr );
    regPrev = sqlite3GetTempRange(pParse, nExpr+1);
    sqlite3VdbeAddOp2(v, OP_Integer, 0, regPrev);
    pKeyDup = sqlite3DbMallocZero(db,
                  sizeof(*pKeyDup) + nExpr*(sizeof(CollSeq*)+1) );
    if( pKeyDup ){
      pKeyDup->aSortOrder = (u8*)&pKeyDup->aColl[nExpr];
      pKeyDup->nField = nExpr;







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**    May you find forgiveness for yourself and forgive others.
**    May you share freely, never taking more than you give.
**
*************************************************************************
** This file contains C code routines that are called by the parser
** to handle SELECT statements in SQLite.
**
** $Id: select.c,v 1.481 2008/10/30 22:13:23 drh Exp $
*/
#include "sqliteInt.h"


/*
** Delete all the content of a Select structure but do not deallocate
** the select structure itself.
................................................................................
  ** for the logic that removes duplicate result rows when the
  ** operator is UNION, EXCEPT, or INTERSECT (but not UNION ALL).
  */
  if( op==TK_ALL ){
    regPrev = 0;
  }else{
    int nExpr = p->pEList->nExpr;
    assert( nOrderBy>=nExpr || db->mallocFailed );
    regPrev = sqlite3GetTempRange(pParse, nExpr+1);
    sqlite3VdbeAddOp2(v, OP_Integer, 0, regPrev);
    pKeyDup = sqlite3DbMallocZero(db,
                  sizeof(*pKeyDup) + nExpr*(sizeof(CollSeq*)+1) );
    if( pKeyDup ){
      pKeyDup->aSortOrder = (u8*)&pKeyDup->aColl[nExpr];
      pKeyDup->nField = nExpr;

Changes to test/mallocJ.test.

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#    May you share freely, never taking more than you give.
#
#***********************************************************************
#
# This test script checks malloc failures in LIMIT operations for 
# UPDATE/DELETE statements.
# 
# $Id: mallocJ.test,v 1.1 2008/10/10 13:34:30 shane Exp $

set testdir [file dirname $argv0]
source $testdir/tester.tcl
source $testdir/malloc_common.tcl

ifcapable {update_delete_limit} {

  do_malloc_test mallocJ-4 -sqlprep {
    DROP TABLE IF EXISTS t1;
    CREATE TABLE t1(x int, y int);
    INSERT INTO t1 VALUES(1,1);
    INSERT INTO t1 VALUES(1,2);
    INSERT INTO t1 VALUES(1,2);
    INSERT INTO t1 VALUES(2,1);
    INSERT INTO t1 VALUES(2,2);
................................................................................
    UPDATE t1 SET x=1 ORDER BY y LIMIT 2 OFFSET 2;
    UPDATE t1 SET x=2 WHERE y=1 ORDER BY y LIMIT 2 OFFSET 2;
    DELETE FROM t1 WHERE x=1 ORDER BY y LIMIT 2 OFFSET 2;
    DELETE FROM t1 ORDER BY y LIMIT 2 OFFSET 2;
  }

}












finish_test







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#    May you share freely, never taking more than you give.
#
#***********************************************************************
#
# This test script checks malloc failures in LIMIT operations for 
# UPDATE/DELETE statements.
# 
# $Id: mallocJ.test,v 1.2 2008/10/30 22:13:23 drh Exp $

set testdir [file dirname $argv0]
source $testdir/tester.tcl
source $testdir/malloc_common.tcl

ifcapable {update_delete_limit} {

  do_malloc_test mallocJ-1 -sqlprep {
    DROP TABLE IF EXISTS t1;
    CREATE TABLE t1(x int, y int);
    INSERT INTO t1 VALUES(1,1);
    INSERT INTO t1 VALUES(1,2);
    INSERT INTO t1 VALUES(1,2);
    INSERT INTO t1 VALUES(2,1);
    INSERT INTO t1 VALUES(2,2);
................................................................................
    UPDATE t1 SET x=1 ORDER BY y LIMIT 2 OFFSET 2;
    UPDATE t1 SET x=2 WHERE y=1 ORDER BY y LIMIT 2 OFFSET 2;
    DELETE FROM t1 WHERE x=1 ORDER BY y LIMIT 2 OFFSET 2;
    DELETE FROM t1 ORDER BY y LIMIT 2 OFFSET 2;
  }

}

# ticket #3467
do_malloc_test mallocJ-2 -sqlprep {
  CREATE TABLE t1(a,b);
  INSERT INTO t1 VALUES(1,2);
} -sqlbody {
  SELECT a, b, 'abc' FROM t1
    UNION
    SELECT b, a, 'xyz' FROM t1
    ORDER BY 2, 3;
}

finish_test