From 9b46abb7c47de8aa408a8c83666fd67c5447eb85 Mon Sep 17 00:00:00 2001
From: Tom Lane
Date: Fri, 31 Oct 2008 19:37:56 +0000
Subject: Allow SQL-language functions to return the output of an
 INSERT/UPDATE/DELETE RETURNING clause, not just a SELECT as formerly.

A side effect of this patch is that when a set-returning SQL function is used
in a FROM clause, performance is improved because the output is collected into
a tuplestore within the function, rather than using the less efficient
value-per-call mechanism.
---
 src/backend/tcop/dest.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

(limited to 'src/backend/tcop/dest.c')

diff --git a/src/backend/tcop/dest.c b/src/backend/tcop/dest.c
index d5b420b1c86..e687c52f803 100644
--- a/src/backend/tcop/dest.c
+++ b/src/backend/tcop/dest.c
@@ -8,7 +8,7 @@
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/tcop/dest.c,v 1.72 2008/01/01 19:45:52 momjian Exp $
+ *	  $PostgreSQL: pgsql/src/backend/tcop/dest.c,v 1.73 2008/10/31 19:37:56 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -32,6 +32,7 @@
 #include "access/xact.h"
 #include "commands/copy.h"
 #include "executor/executor.h"
+#include "executor/functions.h"
 #include "executor/tstoreReceiver.h"
 #include "libpq/libpq.h"
 #include "libpq/pqformat.h"
@@ -132,6 +133,9 @@ CreateDestReceiver(CommandDest dest, Portal portal)
 
 		case DestCopyOut:
 			return CreateCopyDestReceiver();
+
+		case DestSQLFunction:
+			return CreateSQLFunctionDestReceiver();
 	}
 
 	/* should never get here */
@@ -158,6 +162,7 @@ EndCommand(const char *commandTag, CommandDest dest)
 		case DestTuplestore:
 		case DestIntoRel:
 		case DestCopyOut:
+		case DestSQLFunction:
 			break;
 	}
 }
@@ -198,6 +203,7 @@ NullCommand(CommandDest dest)
 		case DestTuplestore:
 		case DestIntoRel:
 		case DestCopyOut:
+		case DestSQLFunction:
 			break;
 	}
 }
@@ -240,6 +246,7 @@ ReadyForQuery(CommandDest dest)
 		case DestTuplestore:
 		case DestIntoRel:
 		case DestCopyOut:
+		case DestSQLFunction:
 			break;
 	}
 }
-- 
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