diff options
Diffstat (limited to 'src/backend/executor/execAmi.c')
| -rw-r--r-- | src/backend/executor/execAmi.c | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/src/backend/executor/execAmi.c b/src/backend/executor/execAmi.c index 3565a2fb12a..b637b5a08f2 100644 --- a/src/backend/executor/execAmi.c +++ b/src/backend/executor/execAmi.c @@ -6,7 +6,7 @@ * Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * - * $PostgreSQL: pgsql/src/backend/executor/execAmi.c,v 1.94 2008/01/01 19:45:49 momjian Exp $ + * $PostgreSQL: pgsql/src/backend/executor/execAmi.c,v 1.95 2008/07/10 01:17:29 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -63,7 +63,19 @@ ExecReScan(PlanState *node, ExprContext *exprCtxt) if (node->instrument) InstrEndLoop(node->instrument); - /* If we have changed parameters, propagate that info */ + /* + * If we have changed parameters, propagate that info. + * + * Note: ExecReScanSetParamPlan() can add bits to node->chgParam, + * corresponding to the output param(s) that the InitPlan will update. + * Since we make only one pass over the list, that means that an InitPlan + * can depend on the output param(s) of a sibling InitPlan only if that + * sibling appears earlier in the list. This is workable for now given + * the limited ways in which one InitPlan could depend on another, but + * eventually we might need to work harder (or else make the planner + * enlarge the extParam/allParam sets to include the params of depended-on + * InitPlans). + */ if (node->chgParam != NULL) { ListCell *l; |