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Instead of rechecking lossy index operators by putting them into the

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regular qpqual ('filter condition'), add special-purpose code to
nodeIndexscan.c to recheck them.  This ends being almost no net addition
of code, because the removal of planner code balances out the extra
executor code, but it is significantly more efficient when a lossy
operator is involved in an OR indexscan.  The old implementation had
to recheck the entire indexqual in such cases.
This commit is contained in:
Tom Lane
2004-01-06 04:31:01 +00:00
parent fa559a86ee
commit b0c4a50bbb
8 changed files with 134 additions and 114 deletions
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6
src/backend/optimizer/plan/setrefs.c
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@ -9,7 +9,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/optimizer/plan/setrefs.c,v 1.99 2003/11/29 19:51:50 pgsql Exp $
* $PostgreSQL: pgsql/src/backend/optimizer/plan/setrefs.c,v 1.100 2004/01/06 04:31:01 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -362,8 +362,8 @@ set_join_references(Join *join, List *rtable)
/*
* We must fix the inner qpqual too, if it has join
* clauses (this could happen if the index is lossy: some
* indxquals may get rechecked as qpquals).
* clauses (this could happen if special operators are
* involved: some indxquals may get rechecked as qpquals).
*/
if (NumRelids((Node *) inner_plan->qual) > 1)
inner_plan->qual = join_references(inner_plan->qual,