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https://issues.apache.org/jira/browse/BEAM-10517?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kenneth Knowles resolved BEAM-10517.
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Fix Version/s: 2.24.0
Resolution: Fixed
> DirectRunner multi step combine has questionable null / Map treatment
> ---------------------------------------------------------------------
>
> Key: BEAM-10517
> URL: https://issues.apache.org/jira/browse/BEAM-10517
> Project: Beam
> Issue Type: Bug
> Components: runner-direct
> Reporter: Kenneth Knowles
> Assignee: Kenneth Knowles
> Priority: P1
> Fix For: 2.24.0
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> When outputting accumulators in pre-combine, the direct runner iterates over
> a map of accumulators. However, since an accumulator can be null (such as in
> zetasketch) these accumulators will not be output.
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