Github user koertkuipers commented on the issue:
https://github.com/apache/spark/pull/21345
we are testing spark 2.4 internally and had some unit tests break because
of this change i believe.
i am not suggesting this should be changed or undone, just wanted to point
out that it might have minor implications for people upgrading. so this is just
an FYI.
it seems that our unit tests for logic that uses flatMapGroupsWithState
with GroupStateTimeout.ProcessingTimeTimeout now will hang if
query.processAllAvailable() is called. so i am looking for an alternative way
to test now that does not involve usage of processAllAvailable.
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