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https://issues.apache.org/jira/browse/DRILL-4443?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15183988#comment-15183988
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ASF GitHub Bot commented on DRILL-4443:
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Github user hnfgns commented on the pull request:
https://github.com/apache/drill/pull/409#issuecomment-193500314
+1
> 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: Hanifi Gunes
> 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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