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Aggregate functions now support multiple input arguments. I also took

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the opportunity to treat COUNT(*) as a zero-argument aggregate instead
of the old hack that equated it to COUNT(1); this is materially cleaner
(no more weird ANYOID cases) and ought to be at least a tiny bit faster.
Original patch by Sergey Koposov; review, documentation, simple regression
tests, pg_dump and psql support by moi.
This commit is contained in:
Tom Lane
2006-07-27 19:52:07 +00:00
parent c2d1138351
commit 108fe47301
39 changed files with 702 additions and 484 deletions
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7
src/backend/executor/execQual.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/executor/execQual.c,v 1.192 2006/07/14 14:52:19 momjian Exp $
* $PostgreSQL: pgsql/src/backend/executor/execQual.c,v 1.193 2006/07/27 19:52:05 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -3174,10 +3174,11 @@ ExecInitExpr(Expr *node, PlanState *parent)
aggstate->aggs = lcons(astate, aggstate->aggs);
naggs = ++aggstate->numaggs;
astate->target = ExecInitExpr(aggref->target, parent);
astate->args = (List *) ExecInitExpr((Expr *) aggref->args,
parent);
/*
* Complain if the aggregate's argument contains any
* Complain if the aggregate's arguments contain any
* aggregates; nested agg functions are semantically
* nonsensical. (This should have been caught earlier,
* but we defend against it here anyway.)