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https://issues.apache.org/jira/browse/SPARK-22206?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hyukjin Kwon resolved SPARK-22206.
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Resolution: Fixed
Fix Version/s: 2.1.3
2.3.0
2.2.1
Issue resolved by pull request 19436
[https://github.com/apache/spark/pull/19436]
> gapply in R can't work on empty grouping columns
> ------------------------------------------------
>
> Key: SPARK-22206
> URL: https://issues.apache.org/jira/browse/SPARK-22206
> Project: Spark
> Issue Type: Bug
> Components: SparkR, SQL
> Affects Versions: 2.2.0
> Reporter: Liang-Chi Hsieh
> Fix For: 2.2.1, 2.3.0, 2.1.3
>
>
> {{gapply}} in R invokes {{FlatMapGroupsInRExec}} in runtime, but
> {{FlatMapGroupsInRExec.requiredChildDistribution}} didn't consider empty
> grouping attributes. So {{gapply}} can't work on empty grouping columns.
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