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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DRILL-5165) wrong results - LIMIT ALL and OFFSET clause in same query
Date Wed, 08 Mar 2017 18:56:38 GMT

    [ https://issues.apache.org/jira/browse/DRILL-5165?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15901777#comment-15901777
] 

ASF GitHub Bot commented on DRILL-5165:
---------------------------------------

Github user jinfengni commented on a diff in the pull request:

    https://github.com/apache/drill/pull/776#discussion_r104993761
  
    --- Diff: exec/java-exec/src/test/java/org/apache/drill/exec/physical/impl/limit/TestLimitWithExchanges.java
---
    @@ -125,6 +125,15 @@ public void testLimitImpactExchange() throws Exception {
         }
       }
     
    +  @Test
    +  public void TestLimitAllOnParquet() throws Exception {
    --- End diff --
    
    Have you tried this new testcase without the change above? Will it successful or fail?



> 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
>            Assignee: Chunhui Shi
>            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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