Index: src/select.c
==================================================================
--- src/select.c
+++ src/select.c
@@ -744,11 +744,11 @@
   ** part of the result.
   */
   if( hasDistinct ){
     switch( pDistinct->eTnctType ){
       case WHERE_DISTINCT_ORDERED: {
-#if 0
+#if 1
         VdbeOp *pOp;            /* No longer required OpenEphemeral instr. */
         int iJump;              /* Jump destination */
         int regPrev;            /* Previous row content */
 
         /* Allocate space for the previous row */

Index: test/distinct2.test
==================================================================
--- test/distinct2.test
+++ test/distinct2.test
@@ -75,7 +75,14 @@
   INSERT INTO t5(a,b) VALUES(0,0),(1,0),(1,1),(0,3);
   CREATE TEMP TABLE out AS SELECT DISTINCT a+b FROM t5;
   SELECT * FROM out ORDER BY 1;
 } {0 1 2 3}
 
+do_execsql_test 600 {
+  CREATE TABLE t6a(x INTEGER PRIMARY KEY);
+  INSERT INTO t6a VALUES(1);
+  CREATE TABLE t6b(y INTEGER PRIMARY KEY);
+  INSERT INTO t6b VALUES(2),(3);
+  SELECT DISTINCT x, x FROM t6a, t6b;
+} {1 1}
 
 finish_test