* columns. (ie. tuples from the same group are consecutive)
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/executor/nodeGroup.c,v 1.11 1997/10/27 12:00:43 vadim Exp $
+ * $Header: /cvsroot/pgsql/src/backend/executor/nodeGroup.c,v 1.12 1998/01/26 00:21:02 scrappy Exp $
*
*-------------------------------------------------------------------------
*/
if (isNull1 == isNull2)
{
- if (isNull1) /* both are null, they are equal */
- continue;
+ /* both are null, they are _not_ equal since
+ * NULL is not equal to NULL (or anything).
+ * -- 25 Jan 1998 -- darrenk */
+ if (isNull1)
+ return FALSE;
val1 = fmgr(typoutput, attr1,
gettypelem(tupdesc->attrs[att - 1]->atttypid));