database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-07-07 00:36:50 +03:00
Code Activity

Add the ability to extract OR indexscan conditions from OR-of-AND

Browse Source 
join conditions in which each OR subclause includes a constraint on
the same relation.  This implements the other useful side-effect of
conversion to CNF format, without its unpleasant side-effects.  As
per pghackers discussion of a few weeks ago.
This commit is contained in:
Tom Lane
2004-01-05 05:07:36 +00:00
parent bf488a6842
commit 9091e8d1b2
16 changed files with 438 additions and 295 deletions
Download Patch File Download Diff File Expand all files Collapse all files

15
src/backend/optimizer/path/allpaths.c
View File

@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/optimizer/path/allpaths.c,v 1.110 2003/12/17 17:07:48 tgl Exp $
* $PostgreSQL: pgsql/src/backend/optimizer/path/allpaths.c,v 1.111 2004/01/05 05:07:35 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -151,6 +151,17 @@ set_plain_rel_pathlist(Query *root, RelOptInfo *rel, RangeTblEntry *rte)
/* Mark rel with estimated output rows, width, etc */
set_baserel_size_estimates(root, rel);
/* Test any partial indexes of rel for applicability */
check_partial_indexes(root, rel);
/*
* Check to see if we can extract any restriction conditions from
* join quals that are OR-of-AND structures. If so, add them to the
* rel's restriction list, and recompute the size estimates.
*/
if (create_or_index_quals(root, rel))
set_baserel_size_estimates(root, rel);
/*
* Generate paths and add them to the rel's pathlist.
*
@ -167,8 +178,6 @@ set_plain_rel_pathlist(Query *root, RelOptInfo *rel, RangeTblEntry *rte)
/* Consider index paths for both simple and OR index clauses */
create_index_paths(root, rel);
/* create_index_paths must be done before create_or_index_paths */
create_or_index_paths(root, rel);
/* Now find the cheapest of the paths for this rel */