diff options
Diffstat (limited to 'src/backend/optimizer/plan/subselect.c')
| -rw-r--r-- | src/backend/optimizer/plan/subselect.c | 46 |
1 files changed, 24 insertions, 22 deletions
diff --git a/src/backend/optimizer/plan/subselect.c b/src/backend/optimizer/plan/subselect.c index 0a7d4926b76..9d47b60430a 100644 --- a/src/backend/optimizer/plan/subselect.c +++ b/src/backend/optimizer/plan/subselect.c @@ -7,7 +7,7 @@ * Portions Copyright (c) 1994, Regents of the University of California * * IDENTIFICATION - * $Header: /cvsroot/pgsql/src/backend/optimizer/plan/subselect.c,v 1.48 2001/01/24 19:42:59 momjian Exp $ + * $Header: /cvsroot/pgsql/src/backend/optimizer/plan/subselect.c,v 1.49 2001/03/22 03:59:37 momjian Exp $ * *------------------------------------------------------------------------- */ @@ -82,12 +82,12 @@ replace_var(Var *var) /* * If there's already a PlannerParamVar entry for this same Var, just - * use it. NOTE: in sufficiently complex querytrees, it is - * possible for the same varno/varlevel to refer to different RTEs in - * different parts of the parsetree, so that different fields might - * end up sharing the same Param number. As long as we check the - * vartype as well, I believe that this sort of aliasing will cause no - * trouble. The correct field should get stored into the Param slot at + * use it. NOTE: in sufficiently complex querytrees, it is possible + * for the same varno/varlevel to refer to different RTEs in different + * parts of the parsetree, so that different fields might end up + * sharing the same Param number. As long as we check the vartype as + * well, I believe that this sort of aliasing will cause no trouble. + * The correct field should get stored into the Param slot at * execution in each part of the tree. */ i = 0; @@ -142,10 +142,10 @@ make_subplan(SubLink *slink) elog(ERROR, "make_subplan: invalid expression structure (subquery already processed?)"); /* - * Copy the source Query node. This is a quick and dirty kluge to resolve - * the fact that the parser can generate trees with multiple links to the - * same sub-Query node, but the planner wants to scribble on the Query. - * Try to clean this up when we do querytree redesign... + * Copy the source Query node. This is a quick and dirty kluge to + * resolve the fact that the parser can generate trees with multiple + * links to the same sub-Query node, but the planner wants to scribble + * on the Query. Try to clean this up when we do querytree redesign... */ subquery = (Query *) copyObject(subquery); @@ -183,7 +183,8 @@ make_subplan(SubLink *slink) */ node->plan = plan = subquery_planner(subquery, tuple_fraction); - node->plan_id = PlannerPlanId++; /* Assign unique ID to this SubPlan */ + node->plan_id = PlannerPlanId++; /* Assign unique ID to this + * SubPlan */ node->rtable = subquery->rtable; node->sublink = slink; @@ -191,8 +192,8 @@ make_subplan(SubLink *slink) slink->subselect = NULL; /* cool ?! see error check above! */ /* - * Make parParam list of params that current query level will pass - * to this child plan. + * Make parParam list of params that current query level will pass to + * this child plan. */ foreach(lst, plan->extParam) { @@ -275,7 +276,7 @@ make_subplan(SubLink *slink) tup = SearchSysCache(OPEROID, ObjectIdGetDatum(oper->opno), 0, 0, 0); - if (! HeapTupleIsValid(tup)) + if (!HeapTupleIsValid(tup)) elog(ERROR, "cache lookup failed for operator %u", oper->opno); opform = (Form_pg_operator) GETSTRUCT(tup); @@ -413,7 +414,7 @@ make_subplan(SubLink *slink) tup = SearchSysCache(OPEROID, ObjectIdGetDatum(oper->opno), 0, 0, 0); - if (! HeapTupleIsValid(tup)) + if (!HeapTupleIsValid(tup)) elog(ERROR, "cache lookup failed for operator %u", oper->opno); opform = (Form_pg_operator) GETSTRUCT(tup); @@ -614,15 +615,16 @@ SS_finalize_plan(Plan *plan) break; case T_SubqueryScan: + /* - * In a SubqueryScan, SS_finalize_plan has already been run - * on the subplan by the inner invocation of subquery_planner, - * so there's no need to do it again. Instead, just pull out - * the subplan's extParams list, which represents the params - * it needs from my level and higher levels. + * In a SubqueryScan, SS_finalize_plan has already been run on + * the subplan by the inner invocation of subquery_planner, so + * there's no need to do it again. Instead, just pull out the + * subplan's extParams list, which represents the params it + * needs from my level and higher levels. */ results.paramids = set_unioni(results.paramids, - ((SubqueryScan *) plan)->subplan->extParam); + ((SubqueryScan *) plan)->subplan->extParam); break; case T_IndexScan: |