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https://issues.apache.org/jira/browse/FLINK-20764?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xintong Song closed FLINK-20764.
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Resolution: Fixed
Fixed via:
* master (1.13): b474d2872f4a82d838ac23252254253df4ca2309
* release-1.12: bdbbb3907865342a7da5be899313422f23d386ee
> BatchGroupedReduceOperator does not emit results for singleton inputs
> ---------------------------------------------------------------------
>
> Key: FLINK-20764
> URL: https://issues.apache.org/jira/browse/FLINK-20764
> Project: Flink
> Issue Type: Bug
> Components: API / DataStream
> Affects Versions: 1.12.0
> Reporter: Aljoscha Krettek
> Assignee: Aljoscha Krettek
> Priority: Blocker
> Labels: pull-request-available
> Fix For: 1.13.0, 1.12.1
>
>
> This was reported on the ML:
> https://lists.apache.org/thread.html/rf24ff56408d3f07a02a3726336229a5919e62c4179c9eb8361a5b76b%40%3Cuser.flink.apache.org%3E.
> The problem is that the logic for setting up the "final" timer does not kick
> in when there is only on input.
> I'll cut a PR for that and also add tests for the operator.
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