diff options
| author | Tom Lane <tgl@sss.pgh.pa.us> | 2009-04-19 19:46:33 +0000 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2009-04-19 19:46:33 +0000 |
| commit | 1d97c19a0f748e94b9582dcbaec33ad74be062f9 (patch) | |
| tree | dc701c3e1de608b76284d5ac34e7566c4b7a8b56 /src/backend/optimizer/path | |
| parent | 3a624e9200bbd8b88d7724e1448fe530f32e2c3c (diff) | |
| download | postgresql-1d97c19a0f748e94b9582dcbaec33ad74be062f9.tar.gz | |
Fix estimate_num_groups() to not fail on PlaceHolderVars, per report from
Stefan Kaltenbrunner. The most reasonable behavior (at least for the near
term) seems to be to ignore the PlaceHolderVar and examine its argument
instead. In support of this, change the API of pull_var_clause() to allow
callers to request recursion into PlaceHolderVars. Currently
estimate_num_groups() is the only customer for that behavior, but where
there's one there may be others.
Diffstat (limited to 'src/backend/optimizer/path')
| -rw-r--r-- | src/backend/optimizer/path/allpaths.c | 4 | ||||
| -rw-r--r-- | src/backend/optimizer/path/equivclass.c | 5 |
2 files changed, 5 insertions, 4 deletions
diff --git a/src/backend/optimizer/path/allpaths.c b/src/backend/optimizer/path/allpaths.c index a172c5de7a..fee9b8fac8 100644 --- a/src/backend/optimizer/path/allpaths.c +++ b/src/backend/optimizer/path/allpaths.c @@ -8,7 +8,7 @@ * * * IDENTIFICATION - * $PostgreSQL: pgsql/src/backend/optimizer/path/allpaths.c,v 1.181 2009/03/10 20:58:26 tgl Exp $ + * $PostgreSQL: pgsql/src/backend/optimizer/path/allpaths.c,v 1.182 2009/04/19 19:46:33 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -1122,7 +1122,7 @@ qual_is_pushdown_safe(Query *subquery, Index rti, Node *qual, * Examine all Vars used in clause; since it's a restriction clause, all * such Vars must refer to subselect output columns. */ - vars = pull_var_clause(qual, true); + vars = pull_var_clause(qual, PVC_INCLUDE_PLACEHOLDERS); foreach(vl, vars) { Var *var = (Var *) lfirst(vl); diff --git a/src/backend/optimizer/path/equivclass.c b/src/backend/optimizer/path/equivclass.c index bc4544e5e0..17c9539679 100644 --- a/src/backend/optimizer/path/equivclass.c +++ b/src/backend/optimizer/path/equivclass.c @@ -10,7 +10,7 @@ * Portions Copyright (c) 1994, Regents of the University of California * * IDENTIFICATION - * $PostgreSQL: pgsql/src/backend/optimizer/path/equivclass.c,v 1.17 2009/02/06 23:43:23 tgl Exp $ + * $PostgreSQL: pgsql/src/backend/optimizer/path/equivclass.c,v 1.18 2009/04/19 19:46:33 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -689,7 +689,8 @@ generate_base_implied_equalities_no_const(PlannerInfo *root, foreach(lc, ec->ec_members) { EquivalenceMember *cur_em = (EquivalenceMember *) lfirst(lc); - List *vars = pull_var_clause((Node *) cur_em->em_expr, true); + List *vars = pull_var_clause((Node *) cur_em->em_expr, + PVC_INCLUDE_PLACEHOLDERS); add_vars_to_targetlist(root, vars, ec->ec_relids); list_free(vars); |