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Fix an oversight I made in a cleanup patch over a year ago:

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eval_const_expressions needs to be passed the PlannerInfo ("root") structure,
because in some cases we want it to substitute values for Param nodes.
(So "constant" is not so constant as all that ...)  This mistake partially
disabled optimization of unnamed extended-Query statements in 8.3: in
particular the LIKE-to-indexscan optimization would never be applied if the
LIKE pattern was passed as a parameter, and constraint exclusion depending
on a parameter value didn't work either.
This commit is contained in:
Tom Lane
2008-04-01 00:48:33 +00:00
parent d344115519
commit 6b73d7e567
8 changed files with 33 additions and 24 deletions
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6
src/backend/optimizer/path/allpaths.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/optimizer/path/allpaths.c,v 1.169 2008/03/24 21:53:03 tgl Exp $
* $PostgreSQL: pgsql/src/backend/optimizer/path/allpaths.c,v 1.170 2008/04/01 00:48:33 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -205,7 +205,7 @@ set_plain_rel_pathlist(PlannerInfo *root, RelOptInfo *rel, RangeTblEntry *rte)
* set_append_rel_pathlist().
*/
if (rel->reloptkind == RELOPT_BASEREL &&
relation_excluded_by_constraints(rel, rte))
relation_excluded_by_constraints(root, rel, rte))
{
set_dummy_rel_pathlist(rel);
return;
@ -321,7 +321,7 @@ set_append_rel_pathlist(PlannerInfo *root, RelOptInfo *rel,
adjust_appendrel_attrs((Node *) rel->baserestrictinfo,
appinfo);
if (relation_excluded_by_constraints(childrel, childRTE))
if (relation_excluded_by_constraints(root, childrel, childRTE))
{
/*
* This child need not be scanned, so we can omit it from the