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https://issues.apache.org/jira/browse/BEAM-1772?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15942408#comment-15942408
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Jingsong Lee commented on BEAM-1772:
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Consider the performance, I retained the combining with sorted data, and
extended a combining based on HashMap State for Non-IntervalWindow merging.
> Support merging WindowFn other than IntervalWindow on Flink Runner
> ------------------------------------------------------------------
>
> Key: BEAM-1772
> URL: https://issues.apache.org/jira/browse/BEAM-1772
> Project: Beam
> Issue Type: Bug
> Components: runner-flink
> Reporter: Ismaël Mejía
> Assignee: Jingsong Lee
>
> Flink currently supports merging IntervalWindows, however if you have a
> WindowFn who extends IntervalWindow the execution breaks.
> I found this while executing a Pipeline in Flink's batch mode.
> This will involve probably changing the window merging logic in
> `FlinkMergingReduceFunction.mergeWindows()` and other similar parts to really
> use the merging logic of the `WindowFn`.
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