Fix pg_get_serial_sequence(), which could incorrectly return the name

of an index on a serial column, rather than the name of the associated
sequence.  Fallout from recent changes in dependency setup for serials.
Per bug #2732 from Basil Evseenko.

src/backend/utils/adt/ruleutils.c

@@ -2,7 +2,7 @@
  * ruleutils.c	- Functions to convert stored expressions/querytrees
  *				back to source text
  *
- *	  $PostgreSQL: pgsql/src/backend/utils/adt/ruleutils.c,v 1.234 2006/10/04 00:29:59 momjian Exp $
+ *	  $PostgreSQL: pgsql/src/backend/utils/adt/ruleutils.c,v 1.235 2006/11/10 22:59:29 tgl Exp $
  **********************************************************************/
 
 #include "postgres.h"
@@ -1288,12 +1288,14 @@ pg_get_serial_sequence(PG_FUNCTION_ARGS)
 		Form_pg_depend deprec = (Form_pg_depend) GETSTRUCT(tup);
 
 		/*
-		 * We assume any auto dependency of a relation on a column must be
-		 * what we are looking for.
+		 * We assume any auto dependency of a sequence on a column must be
+		 * what we are looking for.  (We need the relkind test because indexes
+		 * can also have auto dependencies on columns.)
 		 */
 		if (deprec->classid == RelationRelationId &&
 			deprec->objsubid == 0 &&
-			deprec->deptype == DEPENDENCY_AUTO)
+			deprec->deptype == DEPENDENCY_AUTO &&
+			get_rel_relkind(deprec->objid) == RELKIND_SEQUENCE)
 		{
 			sequenceId = deprec->objid;
 			break;