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Implement outer-level aggregates to conform to the SQL spec, with

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extensions to support our historical behavior.  An aggregate belongs
to the closest query level of any of the variables in its argument,
or the current query level if there are no variables (e.g., COUNT(*)).
The implementation involves adding an agglevelsup field to Aggref,
and treating outer aggregates like outer variables at planning time.
This commit is contained in:
Tom Lane
2003-06-06 15:04:03 +00:00
parent 2c93861f7c
commit e649796f12
26 changed files with 607 additions and 229 deletions
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5
src/backend/executor/nodeAgg.c
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@ -45,7 +45,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/executor/nodeAgg.c,v 1.105 2003/05/30 20:23:10 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/executor/nodeAgg.c,v 1.106 2003/06/06 15:04:01 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -1179,6 +1179,9 @@ ExecInitAgg(Agg *node, EState *estate)
Datum textInitVal;
int i;
/* Planner should have assigned aggregate to correct level */
Assert(aggref->agglevelsup == 0);
/* Look for a previous duplicate aggregate */
for (i = 0; i <= aggno; i++)
{