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From "Rahul Challapalli (JIRA)" <j...@apache.org>
Subject [jira] [Created] (DRILL-3101) Setting "slice_target" to 1 changes the order of the columns in a "select *" query with order by
Date Fri, 15 May 2015 17:35:59 GMT
Rahul Challapalli created DRILL-3101:
----------------------------------------

             Summary: Setting "slice_target" to 1 changes the order of the columns in a "select
*" query with order by
                 Key: DRILL-3101
                 URL: https://issues.apache.org/jira/browse/DRILL-3101
             Project: Apache Drill
          Issue Type: Bug
          Components: Execution - Flow
            Reporter: Rahul Challapalli
            Assignee: Chris Westin


git.commit.id.abbrev=d8b1975

With Default Settings :
{code}
select * from region order by length(r_name);
+-------------+--------+-----------+
| r_regionkey | r_name | r_comment |
+-------------+--------+-----------+
| 2 | ASIA | ges. thinly even pinto beans ca |
| 0 | AFRICA | lar deposits. blithely final packages cajole. regular waters are final requests.
regular accounts are according to  |
| 3 | EUROPE | ly final courts cajole furiously final excuse |
| 1 | AMERICA | hs use ironic, even requests. s |
| 4 | MIDDLE EAST | uickly special accounts cajole carefully blithely close requests. carefully
final asymptotes haggle furiousl |
{code}

Now after setting the slice target to 1, the order of the columns changed
{code}
0: jdbc:drill:schema=dfs_eea> alter session set `planner.slice_target` = 1;
+-------+--------------------------------+
|  ok   |            summary             |
+-------+--------------------------------+
| true  | planner.slice_target updated.  |
+-------+--------------------------------+
1 row selected (0.11 seconds)
0: jdbc:drill:schema=dfs_eea> select * from region order by length(r_name);
+-----------+--------+-------------+
| r_comment | r_name | r_regionkey |
+-----------+--------+-------------+
| ges. thinly even pinto beans ca | ASIA | 2 |
| lar deposits. blithely final packages cajole. regular waters are final requests. regular
accounts are according to  | AFRICA | 0 |
| ly final courts cajole furiously final excuse | EUROPE | 3 |
| hs use ironic, even requests. s | AMERICA | 1 |
| uickly special accounts cajole carefully blithely close requests. carefully final asymptotes
haggle furiousl | MIDDLE EAST | 4 |
+-----------+--------+-------------+
5 rows selected (0.796 seconds)
{code}

This does not happen when we do not use an "order by" in query




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