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https://issues.apache.org/jira/browse/BEAM-11063?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17294668#comment-17294668
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Beam JIRA Bot commented on BEAM-11063:
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This issue was marked "stale-P2" and has not received a public comment in 14
days. It is now automatically moved to P3. If you are still affected by it, you
can comment and move it back to P2.
> FlinkStateInternals assumes that null value for accumulator means that the
> accumulator was never created
> --------------------------------------------------------------------------------------------------------
>
> Key: BEAM-11063
> URL: https://issues.apache.org/jira/browse/BEAM-11063
> Project: Beam
> Issue Type: Bug
> Components: runner-flink
> Reporter: Luke Cwik
> Priority: P3
>
> FlinkStateInternals assumes that null value for accumulator means that the
> accumulator was never created. There are combiners which have non-null values
> returned by createAccumulator but null values after merging.
> It would be good to have a ValidatesRunner test that covers an accumulator
> with a null final value and non-null initial value.
> Code link:
> https://github.com/apache/beam/blob/v2.24.0/runners/flink/src/main/java/org/apache/beam/runners/flink/translation/wrappers/streaming/state/FlinkStateInternals.java#L507
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