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https://issues.apache.org/jira/browse/CALCITE-1116?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15196387#comment-15196387
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Julian Hyde commented on CALCITE-1116:
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No it won't. If {{a}} is null then {{a > 5 AND a <= 5}} evaluates to UNKNOWN.
> Extend simplify for reducing expressions
> ----------------------------------------
>
> Key: CALCITE-1116
> URL: https://issues.apache.org/jira/browse/CALCITE-1116
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Reporter: Jesus Camacho Rodriguez
> Assignee: Jesus Camacho Rodriguez
> Fix For: 1.7.0
>
>
> We would like to cover more cases in expression simplification, such as:
> x>5 and x is not null => x>5
> x>5 and x is null => not satisfiable
> x>5 and x<=5 => not satisfiable
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