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https://issues.apache.org/jira/browse/FLINK-1364?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14267594#comment-14267594
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Gyula Fora commented on FLINK-1364:
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You are right, but still for example grouping a String or any basic type
DataSet/stream is a bit awkward.
> No simple way to group on the whole Tuple/element for DataSets/Streams
> ----------------------------------------------------------------------
>
> Key: FLINK-1364
> URL: https://issues.apache.org/jira/browse/FLINK-1364
> Project: Flink
> Issue Type: Improvement
> Components: Java API, Scala API, Streaming
> Affects Versions: 0.9
> Reporter: Gyula Fora
> Priority: Minor
>
> Currently there is no simple way of grouping on the whole tuple/element.
> Right now the user needs to specify a trivial keyselector which returns the
> element itself.
> I suggest to add a dedicated method for this functionality.
> For instance if no arguments are passed to the groupBy call it would group on
> the elements.
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