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From "Khurram Faraaz (JIRA)" <j...@apache.org>
Subject [jira] [Created] (DRILL-5165) wrong results - LIMIT ALL and OFFSET clause in same query
Date Tue, 27 Dec 2016 08:39:58 GMT
Khurram Faraaz created DRILL-5165:
-------------------------------------

             Summary: wrong results - LIMIT ALL and OFFSET clause in same query
                 Key: DRILL-5165
                 URL: https://issues.apache.org/jira/browse/DRILL-5165
             Project: Apache Drill
          Issue Type: Bug
          Components: Query Planning & Optimization
    Affects Versions: 1.10.0
            Reporter: Khurram Faraaz
            Priority: Critical


This issue was reported by a user on Drill's user list.
Drill 1.10.0 commit ID : bbcf4b76

I tried a similar query on apache Drill 1.10.0 and Drill returns wrong results when compared
to Postgres, for a query that uses LIMIT ALL and OFFSET clause in the same query. We need
to file a JIRA to track this issue.

{noformat}
0: jdbc:drill:schema=dfs.tmp> select col_int from typeall_l order by 1 limit all offset
10;
+----------+
| col_int  |
+----------+
+----------+
No rows selected (0.211 seconds)
0: jdbc:drill:schema=dfs.tmp> select col_int from typeall_l order by col_int limit all
offset 10;
+----------+
| col_int  |
+----------+
+----------+
No rows selected (0.24 seconds)
{noformat}

Query => select col_int from typeall_l limit all offset 10;
Drill 1.10.0 returns 85 rows

whereas for same query,
postgres=# select col_int from typeall_l limit all offset 10;
Postgres 9.3 returns 95 rows, which is the correct expected result.

Query plan for above query that returns wrong results

{noformat}
0: jdbc:drill:schema=dfs.tmp> explain plan for select col_int from typeall_l limit all
offset 10;
+------+------+
| text | json |
+------+------+
| 00-00    Screen
00-01      Project(col_int=[$0])
00-02        SelectionVectorRemover
00-03          Limit(offset=[10])
00-04            Scan(groupscan=[ParquetGroupScan [entries=[ReadEntryWithPath [path=maprfs:///tmp/typeall_l]],
selectionRoot=maprfs:/tmp/typeall_l, numFiles=1, usedMetadataFile=false, columns=[`col_int`]]])
{noformat} 



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