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Revise hash join code so that we can increase the number of batches

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on-the-fly, and thereby avoid blowing out memory when the planner has
underestimated the hash table size.  Hash join will now obey the
work_mem limit with some faithfulness.  Per my recent proposal
(hash aggregate part isn't done yet though).
This commit is contained in:
Tom Lane
2005-03-06 22:15:05 +00:00
parent 31b6d840f6
commit 849074f9ae
9 changed files with 654 additions and 450 deletions
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src/include/utils/selfuncs.h
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@@ -8,7 +8,7 @@
* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/utils/selfuncs.h,v 1.21 2004/12/31 22:03:46 pgsql Exp $
* $PostgreSQL: pgsql/src/include/utils/selfuncs.h,v 1.22 2005/03/06 22:15:05 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -121,7 +121,7 @@ extern double estimate_num_groups(Query *root, List *groupExprs,
double input_rows);
extern Selectivity estimate_hash_bucketsize(Query *root, Node *hashkey,
int nbuckets);
double nbuckets);
extern Datum btcostestimate(PG_FUNCTION_ARGS);
extern Datum rtcostestimate(PG_FUNCTION_ARGS);