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Do not flatten subqueries where the subquery has a LIMIT and the outer

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query has a WHERE clause.  Ticket #3334. (CVS 5613)

FossilOrigin-Name: 4995a1d1c9530be9ce647d338169620cd95a72eb
This commit is contained in:
drh
2008-08-26 12:56:14 +00:00
parent c178ba88a4
commit 229cf702f0
4 changed files with 97 additions and 8 deletions
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6
src/select.c
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@@ -12,7 +12,7 @@
** This file contains C code routines that are called by the parser
** to handle SELECT statements in SQLite.
**
** $Id: select.c,v 1.470 2008/08/25 17:23:29 drh Exp $
** $Id: select.c,v 1.471 2008/08/26 12:56:14 drh Exp $
*/
#include "sqliteInt.h"
@@ -2525,6 +2525,9 @@ static void substSelect(
** ORDER by clause of the parent must be simple references to
** columns of the sub-query.
**
** (19) The subquery does not use LIMIT or the outer query does not
** have a WHERE clause.
**
** In this routine, the "p" parameter is a pointer to the outer query.
** The subquery is p->pSrc->a[iFrom]. isAgg is true if the outer query
** uses aggregates and subqueryIsAgg is true if the subquery uses aggregates.
@@ -2590,6 +2593,7 @@ static int flattenSubquery(
return 0; /* Restriction (11) */
}
if( isAgg && pSub->pOrderBy ) return 0; /* Restriction (16) */
if( pSub->pLimit && p->pWhere ) return 0; /* Restriction (19) */
/* OBSOLETE COMMENT 1:
** Restriction 3: If the subquery is a join, make sure the subquery is