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https://issues.apache.org/jira/browse/FLINK-22719?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17348087#comment-17348087
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Andy commented on FLINK-22719:
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Now there is no possible to do a regular join directly after two window
operations because of the above exception. Is there any need to remove thrown
exception in `WindowJoinUtil` to let those cases fall back to regular join?
> WindowJoinUtil.containsWindowStartEqualityAndEndEquality should not throw
> exception
> -----------------------------------------------------------------------------------
>
> Key: FLINK-22719
> URL: https://issues.apache.org/jira/browse/FLINK-22719
> Project: Flink
> Issue Type: Bug
> Components: Table SQL / Planner
> Reporter: Jingsong Lee
> Priority: Major
> Fix For: 1.14.0
>
>
> This will broke regular join sql.
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