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Repair optimization bug I introduced in a moment of brain fade back in

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Nov 2002: when constant-expression simplification removes all the
aggregate function calls from a query, that doesn't mean we can act as
though there never were any aggregates.  Per bug report from Gabor Szucs.
This commit is contained in:
Tom Lane 2004-02-13 22:26:43 +00:00
parent 3d6dabfc70
commit 0d4c8f26ae
1 changed files with 6 additions and 7 deletions
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13
src/backend/optimizer/plan/planner.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/optimizer/plan/planner.c,v 1.161 2003/09/25 06:58:00 petere Exp $
* $Header: /cvsroot/pgsql/src/backend/optimizer/plan/planner.c,v 1.161.2.1 2004/02/13 22:26:43 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -701,19 +701,18 @@ grouping_planner(Query *parse, double tuple_fraction)
/*
* Will need actual number of aggregates for estimating costs.
* Also, it's possible that optimization has eliminated all
* aggregates, and we may as well check for that here.
*
* Note: we do not attempt to detect duplicate aggregates here; a
* somewhat-overestimated count is okay for our present purposes.
*
* Note: think not that we can turn off hasAggs if we find no aggs.
* It is possible for constant-expression simplification to remove
* all explicit references to aggs, but we still have to follow the
* aggregate semantics (eg, producing only one output row).
*/
if (parse->hasAggs)
{
numAggs = count_agg_clause((Node *) tlist) +
count_agg_clause(parse->havingQual);
if (numAggs == 0)
parse->hasAggs = false;
}
/*
* Figure out whether we need a sorted result from query_planner.