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https://issues.apache.org/jira/browse/BEAM-11637?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kenneth Knowles updated BEAM-11637:
-----------------------------------
    Status: Open  (was: Triage Needed)

> BitAnd unsafely mutates an instance field.
> ------------------------------------------
>
>                 Key: BEAM-11637
>                 URL: https://issues.apache.org/jira/browse/BEAM-11637
>             Project: Beam
>          Issue Type: Bug
>          Components: dsl-sql
>            Reporter: Kyle Weaver
>            Assignee: Kyle Weaver
>            Priority: P2
>
> BitAnd uses isEmpty, an instance field, to track if inputs seen thus far are 
> null. This is an unsafe usage of CombineFn, since all mutable state is 
> expected to be stored in the Accumulator.



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