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Improve planner's estimation of the space needed for HashAgg plans:

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look at the actual aggregate transition datatypes and the actual overhead
needed by nodeAgg.c, instead of using pessimistic round numbers.
Per a discussion with Michael Tiemann.
This commit is contained in:
Tom Lane
2005-01-28 19:34:28 +00:00
parent c3a4e22e82
commit 0bf2587df4
5 changed files with 141 additions and 71 deletions
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4
src/include/executor/nodeAgg.h
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@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/executor/nodeAgg.h,v 1.23 2004/12/31 22:03:29 pgsql Exp $
* $PostgreSQL: pgsql/src/include/executor/nodeAgg.h,v 1.24 2005/01/28 19:34:18 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -23,6 +23,8 @@ extern TupleTableSlot *ExecAgg(AggState *node);
extern void ExecEndAgg(AggState *node);
extern void ExecReScanAgg(AggState *node, ExprContext *exprCtxt);
extern Size hash_agg_entry_size(int numAggs);
extern Datum aggregate_dummy(PG_FUNCTION_ARGS);
#endif /* NODEAGG_H */