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Improve planning of OR indexscan plans: for quals like

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WHERE (a = 1 or a = 2) and b = 42
and an index on (a,b), include the clause b = 42 in the indexquals
generated for each arm of the OR clause.  Essentially this is an index-
driven conversion from CNF to DNF.  Implementation is a bit klugy, but
better than not exploiting the extra quals at all ...
This commit is contained in:
Tom Lane
2001-06-05 17:13:52 +00:00
parent 7c579fa12d
commit cdd230d628
4 changed files with 87 additions and 62 deletions
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4
src/backend/optimizer/path/allpaths.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/optimizer/path/allpaths.c,v 1.75 2001/06/05 05:26:04 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/optimizer/path/allpaths.c,v 1.76 2001/06/05 17:13:51 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -232,7 +232,7 @@ set_plain_rel_pathlist(Query *root, RelOptInfo *rel, RangeTblEntry *rte)
create_index_paths(root, rel);
/* create_index_paths must be done before create_or_index_paths */
create_or_index_paths(root, rel, rel->baserestrictinfo);
create_or_index_paths(root, rel);
/* Now find the cheapest of the paths for this rel */
set_cheapest(rel);