text: -- @author prabhd 
  -- @created 2012-12-05 12:00:00 
  -- @modified 2012-12-05 12:00:00 
  -- @tags dml 
  -- @db_name dmldb
  -- @description union_update_test14: Update partition key to NULL values when default partition present
  \echo --start_ignore
  set gp_enable_column_oriented_table=on;
  \echo --end_ignore
  
  SELECT COUNT(DISTINCT(d)) FROM dml_union_s; 
  UPDATE dml_union_s SET d = (SELECT NULL INTERSECT ALL SELECT NULL)::numeric;
  SELECT COUNT(DISTINCT(d)) FROM dml_union_s; 
  
  