Aljoscha Krettek created FLINK-20764:
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Summary: BatchGroupedReduceOperator does not emit results for
singleton inputs
Key: FLINK-20764
URL: https://issues.apache.org/jira/browse/FLINK-20764
Project: Flink
Issue Type: Improvement
Components: API / DataStream
Reporter: Aljoscha Krettek
Assignee: Aljoscha Krettek
Fix For: 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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