diff options
Diffstat (limited to 'src/backend/executor/nodeSubplan.c')
| -rw-r--r-- | src/backend/executor/nodeSubplan.c | 18 |
1 files changed, 15 insertions, 3 deletions
diff --git a/src/backend/executor/nodeSubplan.c b/src/backend/executor/nodeSubplan.c index 80679d9f63f..fd74cdc618b 100644 --- a/src/backend/executor/nodeSubplan.c +++ b/src/backend/executor/nodeSubplan.c @@ -7,7 +7,7 @@ * Portions Copyright (c) 1994, Regents of the University of California * * IDENTIFICATION - * $PostgreSQL: pgsql/src/backend/executor/nodeSubplan.c,v 1.72 2005/12/28 01:29:59 tgl Exp $ + * $PostgreSQL: pgsql/src/backend/executor/nodeSubplan.c,v 1.73 2006/02/28 04:10:28 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -625,10 +625,14 @@ slotNoNulls(TupleTableSlot *slot) /* ---------------------------------------------------------------- * ExecInitSubPlan + * + * Note: the eflags are those passed to the parent plan node of this + * subplan; they don't directly describe the execution conditions the + * subplan will face. * ---------------------------------------------------------------- */ void -ExecInitSubPlan(SubPlanState *node, EState *estate) +ExecInitSubPlan(SubPlanState *node, EState *estate, int eflags) { SubPlan *subplan = (SubPlan *) node->xprstate.expr; EState *sp_estate; @@ -678,8 +682,16 @@ ExecInitSubPlan(SubPlanState *node, EState *estate) /* * Start up the subplan (this is a very cut-down form of InitPlan()) + * + * The subplan will never need to do BACKWARD scan or MARK/RESTORE. + * If it is a parameterless subplan (not initplan), we suggest that it + * be prepared to handle REWIND efficiently; otherwise there is no need. */ - node->planstate = ExecInitNode(subplan->plan, sp_estate); + eflags &= EXEC_FLAG_EXPLAIN_ONLY; + if (subplan->parParam == NIL && subplan->setParam == NIL) + eflags |= EXEC_FLAG_REWIND; + + node->planstate = ExecInitNode(subplan->plan, sp_estate, eflags); node->needShutdown = true; /* now we need to shutdown the subplan */ |