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https://issues.apache.org/jira/browse/FLINK-10259?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16618355#comment-16618355
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ASF GitHub Bot commented on FLINK-10259:
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hequn8128 commented on issue #6641: [FLINK-10259] [table] Fix key extraction
for GroupWindows.
URL: https://github.com/apache/flink/pull/6641#issuecomment-422220796
Thanks for the update @fhueske . Looks good to me. +1 to merge
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> Key validation for GroupWindowAggregate is broken
> -------------------------------------------------
>
> Key: FLINK-10259
> URL: https://issues.apache.org/jira/browse/FLINK-10259
> Project: Flink
> Issue Type: Bug
> Components: Table API & SQL
> Reporter: Fabian Hueske
> Assignee: Fabian Hueske
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.7.0, 1.6.2, 1.5.5
>
>
> WindowGroups have multiple equivalent keys (start, end) that should be
> handled differently from other keys. The {{UpdatingPlanChecker}} uses
> equivalence groups to identify equivalent keys but the keys of WindowGroups
> are not correctly assigned to groups.
> This means that we cannot correctly extract keys from queries that use group
> windows.
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