[jira] [Assigned] (BEAM-2499) Fail to merge Custom Windows in Spark runner

["Etienne Chauchot (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/BEAM-2499?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Etienne Chauchot reassigned BEAM-2499:
--------------------------------------

    Assignee: Etienne Chauchot  (was: Amit Sela)

> Fail to merge Custom Windows in Spark runner
> --------------------------------------------
>
>                 Key: BEAM-2499
>                 URL: https://issues.apache.org/jira/browse/BEAM-2499
>             Project: Beam
>          Issue Type: Bug
>          Components: runner-spark
>            Reporter: Etienne Chauchot
>            Assignee: Etienne Chauchot
>
> If we extend {{IntervalWindow}} and we try to merge these custom windows like in this PR:
> https://github.com/apache/beam/pull/3286
> Then spark runner fails with 
> {{org.apache.beam.sdk.Pipeline$PipelineExecutionException: java.lang.ClassCastException: org.apache.beam.sdk.transforms.windowing.IntervalWindow cannot be cast to org.apache.beam.sdk.transforms.windowing.MergingCustomWindowsTest$CustomWindow}}
> It seems to be because of the cast to {{IntervalWindow}} there: https://github.com/apache/beam/blob/master/runners/spark/src/main/java/org/apache/beam/runners/spark/translation/SparkGlobalCombineFn.java#L111



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