Defend against null input in analyze_requires_snapshot(), per report

from Rushabh Lathia.

Back-patch of patch of 2009-01-08.  This is necessary in 8.3, as reported
by Bjorn Munch.  It's not currently necessary in 8.2, AFAICS, but seems
best to include it there too.

diff --git a/src/backend/parser/analyze.c b/src/backend/parser/analyze.c
index 226f7c763398a0e6a9d1134bb8ecf15762f0e43b..65de8610179765488304fa56e8c8dc5bb942a8c6 100644 (file)
--- a/src/backend/parser/analyze.c
+++ b/src/backend/parser/analyze.c
@@ -6,7 +6,7 @@
  * Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- *     $PostgreSQL: pgsql/src/backend/parser/analyze.c,v 1.353.2.2 2008/12/13 02:00:52 tgl Exp $
+ *     $PostgreSQL: pgsql/src/backend/parser/analyze.c,v 1.353.2.3 2009/01/30 16:59:16 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -437,13 +437,17 @@ transformStmt(ParseState *pstate, Node *parseTree,
  *             Returns true if a snapshot must be set before doing parse analysis
  *             on the given raw parse tree.
  *
- * Classification here should match transformStmt().
+ * Classification here should match transformStmt(); but we also have to
+ * allow a NULL input (for Parse/Bind of an empty query string).
  */
 bool
 analyze_requires_snapshot(Node *parseTree)
 {
        bool            result;
 
+       if (parseTree == NULL)
+               return false;
+
        switch (nodeTag(parseTree))
        {
                        /*