Etienne Chauchot created BEAM-2499:
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Summary: 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: Amit Sela
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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