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https://issues.apache.org/jira/browse/FLINK-23758?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18109029#comment-18109029
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Dian Fu commented on FLINK-23758:
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[~beetleyibo] Thanks. Looking forward to the fix!
> PyFlink __invert__ has wrong semantics
> --------------------------------------
>
> Key: FLINK-23758
> URL: https://issues.apache.org/jira/browse/FLINK-23758
> Project: Flink
> Issue Type: Bug
> Components: API / Python
> Affects Versions: 1.13.2
> Reporter: Ingo Bürk
> Assignee: Bettle
> Priority: Minor
>
> PyFlink currently implements __invert__ using IS NOT TRUE. However, IS NOT
> TRUE and NOT behave differently for NULL values.
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