[jira] [Commented] (DRILL-4443) MIN/MAX on VARCHAR throw a NullPointerException

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/DRILL-4443?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15182816#comment-15182816 ] 

ASF GitHub Bot commented on DRILL-4443:
---------------------------------------

GitHub user adeneche opened a pull request:

    https://github.com/apache/drill/pull/409

    DRILL-4443: MIN/MAX on VARCHAR throw a NullPointerException

    

You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/adeneche/incubator-drill DRILL-4443

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/drill/pull/409.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 #409
    
----
commit 0c66812a782a46a64781e4561ca6f607a2a64fde
Author: adeneche <ad...@gmail.com>
Date:   2016-02-26T21:41:36Z

    DRILL-4443: MIN/MAX on VARCHAR throw a NullPointerException

----


> MIN/MAX on VARCHAR throw a NullPointerException
> -----------------------------------------------
>
>                 Key: DRILL-4443
>                 URL: https://issues.apache.org/jira/browse/DRILL-4443
>             Project: Apache Drill
>          Issue Type: Bug
>          Components: Execution - Flow
>    Affects Versions: 1.6.0
>         Environment: 4 node cluster CentOS
>            Reporter: Khurram Faraaz
>            Assignee: Deneche A. Hakim
>            Priority: Critical
>             Fix For: 1.6.0
>
>         Attachments: DRILL_4443.parquet, test4443.csv
>
>
> Using a simple csv file that contains at least 2 groups of rows:
> {noformat}
> a,
> a,
> a,
> b,
> {noformat}
> Running a query with min/max throws a NullPointerException:
> {noformat}
> SELECT MIN(columns[1]) FROM `test4443.csv` GROUP BY columns[0];
> Error: SYSTEM ERROR: NullPointerException
> ...
> {noformat}
> {noformat}
> SELECT MAX(columns[1]) FROM `test4443.csv` GROUP BY columns[0];
> Error: SYSTEM ERROR: NullPointerException
> ...
> {noformat}
> The problem is caused by {{VarCharAggrFunctions.java}} that is not reseting it's internal buffer properly.



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