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Change the planner to allow indexscan qualification clauses to use

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nonconsecutive columns of a multicolumn index, as per discussion around
mid-May (pghackers thread "Best way to scan on-disk bitmaps").  This
turns out to require only minimal changes in btree, and so far as I can
see none at all in GiST.  btcostestimate did need some work, but its
original assumption that index selectivity == heap selectivity was
quite bogus even before this.
This commit is contained in:
Tom Lane
2005-06-13 23:14:49 +00:00
parent 077811605e
commit c186c93148
12 changed files with 208 additions and 114 deletions
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5
src/backend/optimizer/util/plancat.c
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@@ -9,7 +9,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/optimizer/util/plancat.c,v 1.111 2005/06/05 22:32:56 tgl Exp $
* $PostgreSQL: pgsql/src/backend/optimizer/util/plancat.c,v 1.112 2005/06/13 23:14:48 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -161,7 +161,8 @@ get_relation_info(Oid relationObjectId, RelOptInfo *rel)
}
info->relam = indexRelation->rd_rel->relam;
info->amcostestimate = index_cost_estimator(indexRelation);
info->amcostestimate = indexRelation->rd_am->amcostestimate;
info->amoptionalkey = indexRelation->rd_am->amoptionalkey;
/*
* Fetch the ordering operators associated with the index, if