diff options
Diffstat (limited to 'src/backend/executor/nodeNestloop.c')
| -rw-r--r-- | src/backend/executor/nodeNestloop.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/src/backend/executor/nodeNestloop.c b/src/backend/executor/nodeNestloop.c index 917a7011cbf..1bae9805898 100644 --- a/src/backend/executor/nodeNestloop.c +++ b/src/backend/executor/nodeNestloop.c @@ -8,7 +8,7 @@ * * * IDENTIFICATION - * $Header: /cvsroot/pgsql/src/backend/executor/nodeNestloop.c,v 1.29 2002/12/15 16:17:46 tgl Exp $ + * $Header: /cvsroot/pgsql/src/backend/executor/nodeNestloop.c,v 1.30 2003/01/20 18:54:46 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -102,6 +102,15 @@ ExecNestLoop(NestLoopState *node) } /* + * If we're doing an IN join, we want to return at most one row per + * outer tuple; so we can stop scanning the inner scan if we matched on + * the previous try. + */ + if (node->js.jointype == JOIN_IN && + node->nl_MatchedOuter) + node->nl_NeedNewOuter = true; + + /* * Reset per-tuple memory context to free any expression evaluation * storage allocated in the previous tuple cycle. Note this can't * happen until we're done projecting out tuples from a join tuple. @@ -312,6 +321,7 @@ ExecInitNestLoop(NestLoop *node, EState *estate) switch (node->join.jointype) { case JOIN_INNER: + case JOIN_IN: break; case JOIN_LEFT: nlstate->nl_NullInnerTupleSlot = |