From a933ee38bbb8dffbc48a3363a94ff6f2a9f7964d Mon Sep 17 00:00:00 2001
From: Tom Lane <tgl@sss.pgh.pa.us>
Date: Thu, 16 Nov 2000 22:30:52 +0000
Subject: Change SearchSysCache coding conventions so that a reference count is
 maintained for each cache entry.  A cache entry will not be freed until the
 matching ReleaseSysCache call has been executed.  This eliminates worries
 about cache entries getting dropped while still in use.  See my posting to
 pg-hackers of even date for more info.

---
 src/backend/nodes/makefuncs.c | 25 ++++++++++++++++++++++++-
 1 file changed, 24 insertions(+), 1 deletion(-)

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

diff --git a/src/backend/nodes/makefuncs.c b/src/backend/nodes/makefuncs.c
index 45e1c03738c..95bf730963f 100644
--- a/src/backend/nodes/makefuncs.c
+++ b/src/backend/nodes/makefuncs.c
@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/nodes/makefuncs.c,v 1.22 2000/08/08 15:41:24 tgl Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/nodes/makefuncs.c,v 1.23 2000/11/16 22:30:23 tgl Exp $
  *
  * NOTES
  *	  Creator functions in POSTGRES 4.2 are generated automatically. Most of
@@ -20,7 +20,10 @@
  *	  Andrew Yu			Oct 20, 1994	file creation
  */
 #include "postgres.h"
+
 #include "nodes/makefuncs.h"
+#include "utils/lsyscache.h"
+
 
 /*
  * makeOper -
@@ -143,6 +146,26 @@ makeConst(Oid consttype,
 	return cnst;
 }
 
+/*
+ * makeNullConst -
+ *	  creates a Const node representing a NULL of the specified type
+ */
+Const *
+makeNullConst(Oid consttype)
+{
+	int16		typLen;
+	bool		typByVal;
+
+	get_typlenbyval(consttype, &typLen, &typByVal);
+	return makeConst(consttype,
+					 (int) typLen,
+					 (Datum) 0,
+					 true,
+					 typByVal,
+					 false,
+					 false);
+}
+
 /*
  * makeAttr -
  *	  creates an Attr node
-- 
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