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https://issues.apache.org/jira/browse/BEAM-7123?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16822260#comment-16822260
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Rui Wang commented on BEAM-7123:
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This might be a bug of Beam core. Count.CountFn has a default value of 0. But
CountFn was not called when input PCollection is empty. Need further
investigation.
> COUNT(*) should return 0 when input is empty
> --------------------------------------------
>
> Key: BEAM-7123
> URL: https://issues.apache.org/jira/browse/BEAM-7123
> Project: Beam
> Issue Type: Bug
> Components: dsl-sql
> Reporter: Rui Wang
> Assignee: Rui Wang
> Priority: Major
>
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