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https://issues.apache.org/jira/browse/BEAM-4240?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Thomas Groh resolved BEAM-4240.
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Resolution: Fixed
Fix Version/s: Not applicable
> Implement the limited set of portable primitives in the Java DirectRunner
> -------------------------------------------------------------------------
>
> Key: BEAM-4240
> URL: https://issues.apache.org/jira/browse/BEAM-4240
> Project: Beam
> Issue Type: New Feature
> Components: runner-direct
> Reporter: Thomas Groh
> Assignee: Thomas Groh
> Priority: Major
> Fix For: Not applicable
>
>
> This is Flatten, Impulse, GroupByKeyOnly, GroupAlsoByWindow (for the
> implementation of the DirectRunner), and {{ExecutableStage}}
>
> {{Flatten}} and {{Impulse}} are straightforwards. {{GroupByKeyOnly}} requires
> extracting the runner-implementation of the PCollection's {{KeyCoder}}, and
> {{GroupAlsoByWindow}} and {{ExecutableStage}} both have specific concerns and
> are tracked independently
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