database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-07-15 19:21:59 +03:00
Code Activity

Improve planner estimates for size of tuple hash tables.

Browse Source
This commit is contained in:
Tom Lane
2006-06-28 20:04:38 +00:00
parent 485375a1c9
commit 1c1ecd5124
2 changed files with 8 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
src/backend/optimizer/plan/planner.c
View File

@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/optimizer/plan/planner.c,v 1.199 2006/03/05 15:58:29 momjian Exp $
* $PostgreSQL: pgsql/src/backend/optimizer/plan/planner.c,v 1.200 2006/06/28 20:04:38 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -1298,7 +1298,7 @@ choose_hashed_grouping(PlannerInfo *root, double tuple_fraction,
}
/* Estimate per-hash-entry space at tuple width... */
hashentrysize = cheapest_path_width;
hashentrysize = MAXALIGN(cheapest_path_width) + MAXALIGN(sizeof(MinimalTupleData));
/* plus space for pass-by-ref transition values... */
hashentrysize += agg_counts->transitionSpace;
/* plus the per-hash-entry overhead */