text: -- Copyright 2018 Tanel Poder. All rights reserved. More info at http://tanelpoder.com
  -- Licensed under the Apache License, Version 2.0. See LICENSE.txt for terms & conditions.
  
  -- TODO: not working yet
  -- LEADING hint sets the order properly but not the ORDERED hint
  
  drop table t1;
  drop table t2;
  
  create table t1 as select * from all_objects;
  create table t2 as select * from all_objects;
  
  create index i1 on t2(object_id);
  
  exec dbms_stats.gather_table_stats(user,'T1');
  exec dbms_stats.gather_table_stats(user,'T2');
  
  -- ordered hint "ignored" starting from 11.2.0.1 thanks to distinct aggregation transformation
  
  select /*+ ORDERED */ t1.owner, count(distinct t2.object_type) from t2, t1 where t1.object_id = t2.object_id group by t1.owner;
  @x
  
  select /*+ ORDERED NO_TRANSFORM_DISTINCT_AGG */ t1.owner, count(distinct t2.object_type) from t2, t1 where t1.object_id = t2.object_id group by t1.owner;
  @x
  
  