diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/backend/optimizer/path/clausesel.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/src/backend/optimizer/path/clausesel.c b/src/backend/optimizer/path/clausesel.c index f5ee929c56e..dd4a27b96cc 100644 --- a/src/backend/optimizer/path/clausesel.c +++ b/src/backend/optimizer/path/clausesel.c @@ -8,7 +8,7 @@ * * * IDENTIFICATION - * $PostgreSQL: pgsql/src/backend/optimizer/path/clausesel.c,v 1.87 2007/08/31 23:35:22 tgl Exp $ + * $PostgreSQL: pgsql/src/backend/optimizer/path/clausesel.c,v 1.88 2007/11/24 19:08:51 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -101,6 +101,14 @@ clauselist_selectivity(PlannerInfo *root, ListCell *l; /* + * If there's exactly one clause, then no use in trying to match up + * pairs, so just go directly to clause_selectivity(). + */ + if (list_length(clauses) == 1) + return clause_selectivity(root, (Node *) linitial(clauses), + varRelid, jointype); + + /* * Initial scan over clauses. Anything that doesn't look like a potential * rangequery clause gets multiplied into s1 and forgotten. Anything that * does gets inserted into an rqlist entry. |