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authorRobert Haas <rhaas@postgresql.org>2014-11-07 17:26:02 -0500
committerRobert Haas <rhaas@postgresql.org>2014-11-07 17:34:36 -0500
commit0b03e5951bf0a1a8868db13f02049cf686a82165 (patch)
tree3495ca06369ec694e68ac84ed19c296a74521f26 /src/backend/optimizer/plan/subselect.c
parent7250d8535b11d6443a9b27299e586c3df0654302 (diff)
Introduce custom path and scan providers.
This allows extension modules to define their own methods for scanning a relation, and get the core code to use them. It's unclear as yet how much use this capability will find, but we won't find out if we never commit it. KaiGai Kohei, reviewed at various times and in various levels of detail by Shigeru Hanada, Tom Lane, Andres Freund, Álvaro Herrera, and myself.
Diffstat (limited to 'src/backend/optimizer/plan/subselect.c')
-rw-r--r--src/backend/optimizer/plan/subselect.c21
1 files changed, 21 insertions, 0 deletions
diff --git a/src/backend/optimizer/plan/subselect.c b/src/backend/optimizer/plan/subselect.c
index 3e7dc851579..4200ec0a5a7 100644
--- a/src/backend/optimizer/plan/subselect.c
+++ b/src/backend/optimizer/plan/subselect.c
@@ -2283,6 +2283,27 @@ finalize_plan(PlannerInfo *root, Plan *plan, Bitmapset *valid_params,
context.paramids = bms_add_members(context.paramids, scan_params);
break;
+ case T_CustomScan:
+ {
+ CustomScan *custom_scan = (CustomScan *) plan;
+
+ context.paramids = bms_add_members(context.paramids,
+ scan_params);
+ /*
+ * custom-scan provider is responsible to apply
+ * finalize_primnode() on the expression node of
+ * its private fields, but no need to apply it
+ * on the tlist and qual of Plan node because it
+ * is already done above.
+ */
+ if (custom_scan->methods->FinalizeCustomScan)
+ custom_scan->methods->FinalizeCustomScan(root,
+ custom_scan,
+ finalize_primnode,
+ (void *)&context);
+ }
+ break;
+
case T_ModifyTable:
{
ModifyTable *mtplan = (ModifyTable *) plan;