From bb742407947ad1cbf19355d24282380d576e7654 Mon Sep 17 00:00:00 2001
From: Tom Lane <tgl@sss.pgh.pa.us>
Date: Sun, 20 Feb 2011 00:17:18 -0500
Subject: Implement an API to let foreign-data wrappers actually be functional.

This commit provides the core code and documentation needed.  A contrib
module test case will follow shortly.

Shigeru Hanada, Jan Urbanski, Heikki Linnakangas
---
 src/backend/nodes/copyfuncs.c | 44 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)

(limited to 'src/backend/nodes/copyfuncs.c')

diff --git a/src/backend/nodes/copyfuncs.c b/src/backend/nodes/copyfuncs.c
index 9a8a97c4bec..1ba746bb4d8 100644
--- a/src/backend/nodes/copyfuncs.c
+++ b/src/backend/nodes/copyfuncs.c
@@ -23,6 +23,7 @@
 #include "postgres.h"
 
 #include "miscadmin.h"
+#include "foreign/fdwapi.h"
 #include "nodes/plannodes.h"
 #include "nodes/relation.h"
 #include "utils/datum.h"
@@ -549,6 +550,43 @@ _copyWorkTableScan(WorkTableScan *from)
 	return newnode;
 }
 
+/*
+ * _copyForeignScan
+ */
+static ForeignScan *
+_copyForeignScan(ForeignScan *from)
+{
+	ForeignScan *newnode = makeNode(ForeignScan);
+
+	/*
+	 * copy node superclass fields
+	 */
+	CopyScanFields((Scan *) from, (Scan *) newnode);
+
+	/*
+	 * copy remainder of node
+	 */
+	COPY_SCALAR_FIELD(fsSystemCol);
+	COPY_NODE_FIELD(fdwplan);
+
+	return newnode;
+}
+
+/*
+ * _copyFdwPlan
+ */
+static FdwPlan *
+_copyFdwPlan(FdwPlan *from)
+{
+	FdwPlan *newnode = makeNode(FdwPlan);
+
+	COPY_SCALAR_FIELD(startup_cost);
+	COPY_SCALAR_FIELD(total_cost);
+	COPY_NODE_FIELD(fdw_private);
+
+	return newnode;
+}
+
 /*
  * CopyJoinFields
  *
@@ -3839,6 +3877,12 @@ copyObject(void *from)
 		case T_WorkTableScan:
 			retval = _copyWorkTableScan(from);
 			break;
+		case T_ForeignScan:
+			retval = _copyForeignScan(from);
+			break;
+		case T_FdwPlan:
+			retval = _copyFdwPlan(from);
+			break;
 		case T_Join:
 			retval = _copyJoin(from);
 			break;
-- 
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