*
*
* IDENTIFICATION
- * $PostgreSQL: pgsql/src/backend/optimizer/plan/planner.c,v 1.213 2007/02/19 07:03:29 tgl Exp $
+ * $PostgreSQL: pgsql/src/backend/optimizer/plan/planner.c,v 1.215 2007/02/22 22:00:24 tgl Exp $
*
*-------------------------------------------------------------------------
*/
* Query optimizer entry point
*
*****************************************************************************/
-Plan *
+PlannedStmt *
planner(Query *parse, bool isCursor, int cursorOptions,
ParamListInfo boundParams)
{
+ PlannedStmt *result;
PlannerGlobal *glob;
double tuple_fraction;
- Plan *result_plan;
+ PlannerInfo *root;
+ Plan *top_plan;
+ ListCell *lp,
+ *lr;
/*
* Set up global state for this planner invocation. This data is needed
glob->boundParams = boundParams;
glob->paramlist = NIL;
- glob->next_plan_id = 0;
+ glob->subplans = NIL;
+ glob->subrtables = NIL;
+ glob->finalrtable = NIL;
/* Determine what fraction of the plan is likely to be scanned */
if (isCursor)
}
/* primary planning entry point (may recurse for subqueries) */
- result_plan = subquery_planner(glob, parse, 1, tuple_fraction, NULL);
+ top_plan = subquery_planner(glob, parse, 1, tuple_fraction, &root);
/*
* If creating a plan for a scrollable cursor, make sure it can run
*/
if (isCursor && (cursorOptions & CURSOR_OPT_SCROLL))
{
- if (!ExecSupportsBackwardScan(result_plan))
- result_plan = materialize_finished_plan(result_plan);
+ if (!ExecSupportsBackwardScan(top_plan))
+ top_plan = materialize_finished_plan(top_plan);
}
/* final cleanup of the plan */
- result_plan = set_plan_references(result_plan, parse->rtable);
+ Assert(glob->finalrtable == NIL);
+ top_plan = set_plan_references(glob, top_plan, root->parse->rtable);
+ /* ... and the subplans (both regular subplans and initplans) */
+ Assert(list_length(glob->subplans) == list_length(glob->subrtables));
+ forboth(lp, glob->subplans, lr, glob->subrtables)
+ {
+ Plan *subplan = (Plan *) lfirst(lp);
+ List *subrtable = (List *) lfirst(lr);
- /* executor wants to know total number of Params used overall */
- result_plan->nParamExec = list_length(glob->paramlist);
+ lfirst(lp) = set_plan_references(glob, subplan, subrtable);
+ }
- return result_plan;
+ /* build the PlannedStmt result */
+ result = makeNode(PlannedStmt);
+
+ result->commandType = parse->commandType;
+ result->canSetTag = parse->canSetTag;
+ result->planTree = top_plan;
+ result->rtable = glob->finalrtable;
+ result->resultRelations = root->resultRelations;
+ result->into = parse->into;
+ result->subplans = glob->subplans;
+ result->returningLists = root->returningLists;
+ result->rowMarks = parse->rowMarks;
+ result->nParamExec = list_length(glob->paramlist);
+
+ return result;
}
* tuple_fraction is the fraction of tuples we expect will be retrieved.
* tuple_fraction is interpreted as explained for grouping_planner, below.
*
- * If subquery_pathkeys isn't NULL, it receives a list of pathkeys indicating
- * the output sort ordering of the completed plan.
+ * If subroot isn't NULL, we pass back the query's final PlannerInfo struct;
+ * among other things this tells the output sort ordering of the plan.
*
* Basically, this routine does the stuff that should only be done once
* per Query object. It then calls grouping_planner. At one time,
Plan *
subquery_planner(PlannerGlobal *glob, Query *parse,
Index level, double tuple_fraction,
- List **subquery_pathkeys)
+ PlannerInfo **subroot)
{
- int saved_plan_id = glob->next_plan_id;
+ int num_old_subplans = list_length(glob->subplans);
PlannerInfo *root;
Plan *plan;
List *newHaving;
* initPlan list and extParam/allParam sets for plan nodes, and attach the
* initPlans to the top plan node.
*/
- if (root->glob->next_plan_id != saved_plan_id || root->query_level > 1)
+ if (list_length(glob->subplans) != num_old_subplans ||
+ root->query_level > 1)
SS_finalize_plan(root, plan);
- /* Return sort ordering info if caller wants it */
- if (subquery_pathkeys)
- *subquery_pathkeys = root->query_pathkeys;
+ /* Return internal info if caller wants it */
+ if (subroot)
+ *subroot = root;
return plan;
}
/* Build list of per-relation RETURNING targetlists */
if (parse->returningList)
{
- Assert(list_length(subroot.parse->returningLists) == 1);
+ Assert(list_length(subroot.returningLists) == 1);
returningLists = list_concat(returningLists,
- subroot.parse->returningLists);
+ subroot.returningLists);
}
}
- parse->resultRelations = resultRelations;
- parse->returningLists = returningLists;
+ root->resultRelations = resultRelations;
+ root->returningLists = returningLists;
/* Mark result as unordered (probably unnecessary) */
root->query_pathkeys = NIL;
* If we managed to exclude every child rel, return a dummy plan
*/
if (subplans == NIL)
- return (Plan *) make_result(tlist,
+ return (Plan *) make_result(root,
+ tlist,
(Node *) list_make1(makeBoolConst(false,
false)),
NULL);
*/
parse->rtable = rtable;
+ /* Suppress Append if there's only one surviving child rel */
+ if (list_length(subplans) == 1)
+ return (Plan *) linitial(subplans);
+
return (Plan *) make_append(subplans, true, tlist);
}
*/
if (!is_projection_capable_plan(result_plan))
{
- result_plan = (Plan *) make_result(sub_tlist, NULL,
+ result_plan = (Plan *) make_result(root,
+ sub_tlist,
+ NULL,
result_plan);
}
else
* tuples) --- so make_agg() and make_group() are responsible
* for computing the added cost.
*/
- cost_qual_eval(&tlist_cost, sub_tlist);
+ cost_qual_eval(&tlist_cost, sub_tlist, root);
result_plan->startup_cost += tlist_cost.startup;
result_plan->total_cost += tlist_cost.startup +
tlist_cost.per_tuple * result_plan->plan_rows;
* this routine to avoid having to generate the plan in the
* first place.
*/
- result_plan = (Plan *) make_result(tlist,
+ result_plan = (Plan *) make_result(root,
+ tlist,
parse->havingQual,
NULL);
}
{
List *rlist;
+ Assert(parse->resultRelation);
rlist = set_returning_clause_references(parse->returningList,
result_plan,
parse->resultRelation);
- parse->returningLists = list_make1(rlist);
+ root->returningLists = list_make1(rlist);
}
+ else
+ root->returningLists = NIL;
+
+ /* Compute result-relations list if needed */
+ if (parse->resultRelation)
+ root->resultRelations = list_make1_int(parse->resultRelation);
+ else
+ root->resultRelations = NIL;
/*
* Return the actual output ordering in query_pathkeys for possible use by
* pass down only c,d,a+b, but it's not really worth the trouble to
* eliminate simple var references from the subplan. We will avoid doing
* the extra computation to recompute a+b at the outer level; see
- * replace_vars_with_subplan_refs() in setrefs.c.)
+ * fix_upper_expr() in setrefs.c.)
*
* If we are grouping or aggregating, *and* there are no non-Var grouping
* expressions, then the returned tlist is effectively dummy; we do not
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