Restore upstream test query on UPDATE on a view.

It was removed years ago, presumably because GPDB didn't support updates
on views. But it seems to work fine now, so put it back.

src/test/regress/expected/subselect.out

@@ -418,10 +418,14 @@ select * from shipped_view;
 create rule shipped_view_update as on update to shipped_view do instead
     update shipped set partnum = new.partnum, value = new.value
         where ttype = new.ttype and ordnum = new.ordnum;
+update shipped_view set value = 11
+    from int4_tbl a join int4_tbl b
+      on (a.f1 = (select f1 from int4_tbl c where c.f1=b.f1))
+    where ordnum = a.f1;
 select * from shipped_view;
- ttype | ordnum | partnum |  value  
--------+--------+---------+---------
- wt    |      0 | 1       | 1234.56
+ ttype | ordnum | partnum | value 
+-------+--------+---------+-------
+ wt    |      0 | 1       |    11
 (1 row)
 
 select f1, ss1 as relabel from

src/test/regress/expected/subselect_optimizer.out

@@ -418,10 +418,14 @@ select * from shipped_view;
 create rule shipped_view_update as on update to shipped_view do instead
     update shipped set partnum = new.partnum, value = new.value
         where ttype = new.ttype and ordnum = new.ordnum;
+update shipped_view set value = 11
+    from int4_tbl a join int4_tbl b
+      on (a.f1 = (select f1 from int4_tbl c where c.f1=b.f1))
+    where ordnum = a.f1;
 select * from shipped_view;
- ttype | ordnum | partnum |  value  
--------+--------+---------+---------
- wt    |      0 | 1       | 1234.56
+ ttype | ordnum | partnum | value 
+-------+--------+---------+-------
+ wt    |      0 | 1       |    11
 (1 row)
 
 select f1, ss1 as relabel from

src/test/regress/sql/subselect.sql

@@ -241,6 +241,11 @@ create rule shipped_view_update as on update to shipped_view do instead
     update shipped set partnum = new.partnum, value = new.value
         where ttype = new.ttype and ordnum = new.ordnum;
 
+update shipped_view set value = 11
+    from int4_tbl a join int4_tbl b
+      on (a.f1 = (select f1 from int4_tbl c where c.f1=b.f1))
+    where ordnum = a.f1;
+
 select * from shipped_view;
 
 select f1, ss1 as relabel from