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https://issues.apache.org/jira/browse/CALCITE-2438?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Zoltan Haindrich reopened CALCITE-2438:
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      Assignee: Zoltan Haindrich  (was: Julian Hyde)

> RexCall#isAlwaysTrue  return incorrect result
> ---------------------------------------------
>
>                 Key: CALCITE-2438
>                 URL: https://issues.apache.org/jira/browse/CALCITE-2438
>             Project: Calcite
>          Issue Type: Bug
>          Components: core
>    Affects Versions: 1.17.0
>            Reporter: pengzhiwei
>            Assignee: Zoltan Haindrich
>            Priority: Critical
>         Attachments: 屏幕快照 2018-08-02 下午7.26.20.png, 屏幕快照 2018-08-02 
> 下午7.34.26.png
>
>
> In the expression as followed:
> {code:java}
> ((sal IS NULL) IS NOT NULL) IS FALSE
> {code}
> The RexCall#isAlwaysTrue return true,however the correct answer is false.
> I find the reason is that there is a wrong logic in the  isAlwaysTrue,when 
> getKind() is IS_NOT_FALSE、IS_FALSE and IS_NOT_FALSE :
> !屏幕快照 2018-08-02 下午7.34.26.png!
> Can you have a check for me,thanks!



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