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https://issues.apache.org/jira/browse/FLINK-21553?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17294390#comment-17294390
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Andy commented on FLINK-21553:
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[~dwysakowicz] [~maguowei], FLINK-21482 is not the root cause, it does only
fix a minor bug about WindowProperties inference about `Expand` node and add
more test cases to cover groupsets/cube/rollup syntax in wtf. The unstable
ITCase may reflect something went wrong in the physical operator. If the issue
is a blocker, reverting the change is OK for me. I would continue to find root
cause to prevent a deep bug in the Operator.
> WindowDistinctAggregateITCase#testHopWindow_Cube is unstable
> ------------------------------------------------------------
>
> Key: FLINK-21553
> URL: https://issues.apache.org/jira/browse/FLINK-21553
> Project: Flink
> Issue Type: Bug
> Components: Table SQL / Planner
> Reporter: Jark Wu
> Assignee: Andy
> Priority: Blocker
> Labels: test-stability
> Fix For: 1.13.0
>
> Attachments: screenshot-1.png
>
>
> See
> https://dev.azure.com/imjark/Flink/_build/results?buildId=422&view=logs&j=d1352042-8a7d-50b6-3946-a85d176b7981&t=b2322052-d503-5552-81e2-b3a532a1d7e8
> !screenshot-1.png!
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