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https://issues.apache.org/jira/browse/FLINK-3469?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15232466#comment-15232466
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ASF GitHub Bot commented on FLINK-3469:
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Github user fhueske commented on the pull request:
https://github.com/apache/flink/pull/1858#issuecomment-207507759
+1 to merge
> Improve documentation for grouping keys
> ---------------------------------------
>
> Key: FLINK-3469
> URL: https://issues.apache.org/jira/browse/FLINK-3469
> Project: Flink
> Issue Type: Improvement
> Components: Documentation
> Affects Versions: 1.0.0
> Reporter: Greg Hogan
> Assignee: Greg Hogan
> Fix For: 1.1.0
>
>
> The transformation documentation for "Reduce on DataSet Grouped by
> KeySelector Function" uses a field expression in the Java example.
> There are four ways to specify keys and only two have named examples in the
> documentation. Expand the documentation to cover all cases.
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