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Adjust indexscan planning logic to keep RestrictInfo nodes associated

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with index qual clauses in the Path representation.  This saves a little
work during createplan and (probably more importantly) allows reuse of
cached selectivity estimates during indexscan planning.  Also fix latent
bug: wrong plan would have been generated for a 'special operator' used
in a nestloop-inner-indexscan join qual, because the special operator
would not have gotten into the list of quals to recheck.  This bug is
only latent because at present the special-operator code could never
trigger on a join qual, but sooner or later someone will want to do it.
This commit is contained in:
Tom Lane
2004-01-05 23:39:54 +00:00
parent 5d472f6464
commit fa559a86ee
11 changed files with 400 additions and 188 deletions
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14
src/backend/optimizer/util/pathnode.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/optimizer/util/pathnode.c,v 1.98 2004/01/05 18:04:39 tgl Exp $
* $PostgreSQL: pgsql/src/backend/optimizer/util/pathnode.c,v 1.99 2004/01/05 23:39:54 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -354,18 +354,22 @@ create_index_path(Query *root,
pathnode->path.parent = rel;
pathnode->path.pathkeys = pathkeys;
/* Convert RestrictInfo nodes to indexquals the executor can handle */
/* Convert clauses to indexquals the executor can handle */
indexquals = expand_indexqual_conditions(index, restriction_clauses);
/* Flatten the clause-groups list to produce indexclauses list */
restriction_clauses = flatten_clausegroups_list(restriction_clauses);
/*
* We are making a pathnode for a single-scan indexscan; therefore,
* both indexinfo and indexqual should be single-element lists.
* indexinfo etc should be single-element lists.
*/
pathnode->indexinfo = makeList1(index);
pathnode->indexqual = makeList1(indexquals);
pathnode->indexclauses = makeList1(restriction_clauses);
pathnode->indexquals = makeList1(indexquals);
/* It's not an innerjoin path. */
pathnode->indexjoinclauses = NIL;
pathnode->isjoininner = false;
pathnode->indexscandir = indexscandir;