text: -- @author prabhd 
  -- @created 2012-12-05 12:00:00 
  -- @modified 2012-12-05 12:00:00 
  -- @tags dml 
  -- @db_name dmldb
  -- @description union_delete_test10:  With UNION/INTERSECT/EXCEPT in the predicate condition
  \echo --start_ignore
  set gp_enable_column_oriented_table=on;
  \echo --end_ignore
  
  SELECT COUNT(*) FROM dml_union_r;
  DELETE FROM dml_union_r WHERE a = (SELECT a FROM dml_union_r UNION SELECT a FROM dml_union_s ORDER BY a LIMIT 1);
  SELECT COUNT(*) FROM dml_union_r;
  
  