Property changes affecting ordered or sorted subqueries and views
Order by/sort by without limit in subqueries is not supported in Hive 3.
Hive 1 and 2
You can use order by/sort by functionality in subqueries.
For example, the optimizer orders a subquery of the following table:
   
  +--------------------+---------------------+
| test_groupby.col1  | test_groupby.col2   |
+--------------------+---------------------+
| test               | 2                   |
| test               | 3                   |
| test1              | 5                   |
+--------------------+---------------------+
select * from (select * from test_groupby order by col2 desc) t2;
+----------+-----------+
| t2.col1  | t2.col1   |
+----------+-----------+
| test1    | 5         |
| test     | 3         |
| test     | 2         |
+----------+-----------+
  Hive 3
The optimizer removes order by/sort by without limit in subqueries and views. For example:
   
  select * from (select * from test_groupby order by col2 desc) t2;
+----------+-----------+
| t2.col1  | t2.col1   |
+----------+-----------+
| test     | 2         |
| test     | 3         |
| test1    | 5         |
+----------+-----------+Action Required
If the outer query has to perform some functional logic based on order of a subquery,
   the following query in Hive 2 returns a different result from Hive 3:
   
 select col1 from (select * from test_groupby order by col2t desc ) t2 limit 1; You must rewrite the query or set the following property to restore previous behavior:
  
  set hive.remove.orderby.in.subquery=FalseDistribution Affected
CDH5, CDH6
