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https://issues.apache.org/jira/browse/BEAM-794?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15597537#comment-15597537
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ASF GitHub Bot commented on BEAM-794:
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Github user asfgit closed the pull request at:
https://github.com/apache/incubator-beam/pull/1153
> Defer combining in case of merging windows with sideInputs
> -----------------------------------------------------------
>
> Key: BEAM-794
> URL: https://issues.apache.org/jira/browse/BEAM-794
> Project: Beam
> Issue Type: Bug
> Components: runner-spark
> Reporter: Amit Sela
> Assignee: Amit Sela
>
> For background, see BEAM-696.
> If a Combine transformation is applied to a PCollection with merging windows
> and sideInput, the runner should differ the execution of Combine.
> For the SparkRunner this means that it should use groupByKey instead of
> combinePerKey/Globally.
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