database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-11-21 00:42:43 +03:00
Code Activity

Planner failed to be smart about binary-compatible expressions in pathkeys

Browse Source 
and hash bucket-size estimation.  Issue has been there awhile but is more
critical in 7.4 because it affects varchar columns.  Per report from
Greg Stark.
This commit is contained in:
Tom Lane
2003-12-03 17:45:10 +00:00
parent 32580efafb
commit 7f8f7665fc
4 changed files with 64 additions and 13 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
src/backend/optimizer/path/costsize.c
View File

@@ -49,7 +49,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/optimizer/path/costsize.c,v 1.116 2003/11/29 19:51:50 pgsql Exp $
* $PostgreSQL: pgsql/src/backend/optimizer/path/costsize.c,v 1.117 2003/12/03 17:45:07 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -1322,6 +1322,10 @@ estimate_hash_bucketsize(Query *root, Var *var, int nbuckets)
float4 *numbers;
int nnumbers;
/* Ignore any binary-compatible relabeling */
if (var && IsA(var, RelabelType))
var = (Var *) ((RelabelType *) var)->arg;
/*
* Lookup info about var's relation and attribute; if none available,
* return default estimate.