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Improve handling of CustomPath/CustomPlan(State) children.

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Allow CustomPath to have a list of paths, CustomPlan a list of plans,
and CustomPlanState a list of planstates known to the core system, so
that custom path/plan providers can more reasonably use this
infrastructure for nodes with multiple children.

KaiGai Kohei, per a design suggestion from Tom Lane, with some
further kibitzing by me.
This commit is contained in:
Robert Haas
2015-06-26 09:40:47 -04:00
parent 4b8e24b9ad
commit 5ca611841b
8 changed files with 77 additions and 7 deletions
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13
src/backend/optimizer/plan/createplan.c
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@@ -2157,6 +2157,16 @@ create_customscan_plan(PlannerInfo *root, CustomPath *best_path,
{
CustomScan *cplan;
RelOptInfo *rel = best_path->path.parent;
List *custom_plans = NIL;
ListCell *lc;
/* Recursively transform child paths. */
foreach (lc, best_path->custom_paths)
{
Plan *plan = create_plan_recurse(root, (Path *) lfirst(lc));
custom_plans = lappend(custom_plans, plan);
}
/*
* Sort clauses into the best execution order, although custom-scan
@@ -2172,7 +2182,8 @@ create_customscan_plan(PlannerInfo *root, CustomPath *best_path,
rel,
best_path,
tlist,
scan_clauses);
scan_clauses,
custom_plans);
Assert(IsA(cplan, CustomScan));
/*