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Expand the 'special index operator' machinery to handle special cases

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for boolean indexes.  Previously we would only use such an index with
WHERE clauses like 'indexkey = true' or 'indexkey = false'.  The new
code transforms the cases 'indexkey', 'NOT indexkey', 'indexkey IS TRUE',
and 'indexkey IS FALSE' into one of these.  While this is only marginally
useful in itself, I intend soon to change constant-expression simplification
so that 'foo = true' and 'foo = false' are reduced to just 'foo' and
'NOT foo' ... which would lose the ability to use boolean indexes for
such queries at all, if the indexscan machinery couldn't make the
reverse transformation.
This commit is contained in:
Tom Lane
2005-03-26 23:29:20 +00:00
parent 9d388e1f39
commit febc9a613c
5 changed files with 192 additions and 26 deletions
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4
src/backend/optimizer/util/pathnode.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/optimizer/util/pathnode.c,v 1.112 2005/03/10 23:21:22 tgl Exp $
* $PostgreSQL: pgsql/src/backend/optimizer/util/pathnode.c,v 1.113 2005/03/26 23:29:18 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -444,7 +444,7 @@ create_index_path(Query *root,
pathnode->path.pathkeys = pathkeys;
/* Convert clauses to indexquals the executor can handle */
indexquals = expand_indexqual_conditions(index, restriction_clauses);
indexquals = expand_indexqual_conditions(rel, index, restriction_clauses);
/* Flatten the clause-groups list to produce indexclauses list */
restriction_clauses = flatten_clausegroups_list(restriction_clauses);