transformColumnDefinition failed to complain about

	create table foo (bar int default null default 3);
due to not thinking about the special-case handling of DEFAULT NULL.
Problem noticed while investigating bug #3396.

diff --git a/src/backend/parser/analyze.c b/src/backend/parser/analyze.c
index 0df3bec1694722312612e85d6eca35adf2a07f40..e1be8a89467290d1cf8cc9cfe8845d37379f2c88 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 2006/10/11 16:42:59 tgl Exp $
+ * $PostgreSQL: pgsql/src/backend/parser/analyze.c,v 1.353.2.1 2007/06/20 18:21:08 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -1033,6 +1033,7 @@ transformColumnDefinition(ParseState *pstate, CreateStmtContext *cxt,
 {
    bool        is_serial;
    bool        saw_nullable;
+   bool        saw_default;
    Constraint *constraint;
    ListCell   *clist;
 
@@ -1163,6 +1164,7 @@ transformColumnDefinition(ParseState *pstate, CreateStmtContext *cxt,
    transformConstraintAttrs(column->constraints);
 
    saw_nullable = false;
+   saw_default = false;
 
    foreach(clist, column->constraints)
    {
@@ -1207,13 +1209,15 @@ transformColumnDefinition(ParseState *pstate, CreateStmtContext *cxt,
                break;
 
            case CONSTR_DEFAULT:
-               if (column->raw_default != NULL)
+               if (saw_default)
                    ereport(ERROR,
                            (errcode(ERRCODE_SYNTAX_ERROR),
                             errmsg("multiple default values specified for column \"%s\" of table \"%s\"",
                                  column->colname, cxt->relation->relname)));
+               /* Note: DEFAULT NULL maps to constraint->raw_expr == NULL */
                column->raw_default = constraint->raw_expr;
                Assert(constraint->cooked_expr == NULL);
+               saw_default = true;
                break;
 
            case CONSTR_PRIMARY: