1 files changed, 20 insertions, 0 deletions
diff --git a/test/select7.test b/test/select7.test
index 6816b9fcb..9ed535774 100644
--- a/test/select7.test
+++ b/test/select7.test
@@ -15,6 +15,7 @@
 
 set testdir [file dirname $argv0]
 source $testdir/tester.tcl
+set testprefix select7
 
 ifcapable compound {
 
@@ -201,4 +202,23 @@ do_test select7-7.7 {
   }
 } {text 123}
 
+do_execsql_test 8.0 { 
+  CREATE TABLE t01(x, y);
+  CREATE TABLE t02(x, y);
+}
+
+do_catchsql_test 8.1 {
+  SELECT * FROM (
+    SELECT * FROM t01 UNION SELECT x FROM t02
+  ) WHERE y=1
+} {1 {SELECTs to the left and right of UNION do not have the same number of result columns}}
+
+do_catchsql_test 8.2 {
+  CREATE VIEW v0 as SELECT x, y FROM t01 UNION SELECT x FROM t02;
+  EXPLAIN QUERY PLAN SELECT * FROM v0 WHERE x='0' OR y;
+} {1 {SELECTs to the left and right of UNION do not have the same number of result columns}}
+
+
 finish_test
+
+