diff options
Diffstat (limited to 'src/backend/optimizer/path/allpaths.c')
| -rw-r--r-- | src/backend/optimizer/path/allpaths.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/src/backend/optimizer/path/allpaths.c b/src/backend/optimizer/path/allpaths.c index fc618f72d1c..794c14fbbab 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 1.151 2006/08/10 02:36:28 tgl Exp $ + * $PostgreSQL: pgsql/src/backend/optimizer/path/allpaths.c,v 1.152 2006/08/19 02:48:53 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -871,6 +871,10 @@ compare_tlist_datatypes(List *tlist, List *colTypes, * 5. We must not push down any quals that refer to subselect outputs that * return sets, else we'd introduce functions-returning-sets into the * subquery's WHERE/HAVING quals. + * + * 6. We must not push down any quals that refer to subselect outputs that + * contain volatile functions, for fear of introducing strange results due + * to multiple evaluation of a volatile function. */ static bool qual_is_pushdown_safe(Query *subquery, Index rti, Node *qual, @@ -940,6 +944,13 @@ qual_is_pushdown_safe(Query *subquery, Index rti, Node *qual, safe = false; break; } + + /* Refuse volatile functions (point 6) */ + if (contain_volatile_functions((Node *) tle->expr)) + { + safe = false; + break; + } } list_free(vars); |