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https://issues.apache.org/jira/browse/BEAM-6513?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16752950#comment-16752950
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Rui Wang commented on BEAM-6513:
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It is due to ConcurrentLinkedQueue does not permit NULL. Actually I didn't find
concurrent queue/array data structure that accept NULL.
> BeamEnumerableConverter doest not handle Null during collecting values
> ----------------------------------------------------------------------
>
> Key: BEAM-6513
> URL: https://issues.apache.org/jira/browse/BEAM-6513
> Project: Beam
> Issue Type: Bug
> Components: dsl-sql
> Reporter: Rui Wang
> Assignee: Rui Wang
> Priority: Major
>
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