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https://issues.apache.org/jira/browse/DRILL-5165?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15900967#comment-15900967
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ASF GitHub Bot commented on DRILL-5165:
---------------------------------------
GitHub user chunhui-shi opened a pull request:
https://github.com/apache/drill/pull/776
DRILL-5165: limitRel to return correct rows for limit all case
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/chunhui-shi/drill DRILL-5165
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/drill/pull/776.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #776
----
commit cd10342fbcf4b3779b006515fb940137d9035157
Author: chunhui-shi <[email protected]>
Date: 2017-03-08T07:39:32Z
DRILL-5165: limitRel to return correct rows for limit all case
----
> 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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