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Do not let the reverse_unordered_selects pragma force the use of an index that

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would not otherwise be used.  Ticket #3904.
Also: remove an test which is always true. (CVS 6745)

FossilOrigin-Name: 78a391dca05dbe3ad1d8124b80b31bc2ce75778f
This commit is contained in:
drh
2009-06-10 19:33:28 +00:00
parent 85119c32ad
commit 5901b571d4
4 changed files with 47 additions and 12 deletions
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6
src/where.c
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@@ -16,7 +16,7 @@
** so is applicable. Because this module is responsible for selecting
** indices, you might also think of this module as the "query optimizer".
**
** $Id: where.c,v 1.404 2009/06/08 19:44:37 drh Exp $
** $Id: where.c,v 1.405 2009/06/10 19:33:29 drh Exp $
*/
#include "sqliteInt.h"
@@ -1884,7 +1884,7 @@ static void bestVirtualIndex(
pCost->rCost = pIdxInfo->estimatedCost;
}
pCost->plan.u.pVtabIdx = pIdxInfo;
if( pIdxInfo && pIdxInfo->orderByConsumed ){
if( pIdxInfo->orderByConsumed ){
pCost->plan.wsFlags |= WHERE_ORDERBY;
}
pCost->plan.nEq = 0;
@@ -2170,7 +2170,7 @@ static void bestBtreeIndex(
cost += cost*estLog(cost);
WHERETRACE(("...... orderby increases cost to %.9g\n", cost));
}
}else if( pParse->db->flags & SQLITE_ReverseOrder ){
}else if( wsFlags!=0 && (pParse->db->flags & SQLITE_ReverseOrder)!=0 ){
/* For application testing, randomly reverse the output order for
** SELECT statements that omit the ORDER BY clause. This will help
** to find cases where