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https://issues.apache.org/jira/browse/CALCITE-1638?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Julian Hyde resolved CALCITE-1638.
----------------------------------
       Resolution: Fixed
    Fix Version/s: 1.12.0

Fixed in http://git-wip-us.apache.org/repos/asf/calcite/commit/34997ad1.

The change also simplifies "x < x", "x <= x", "x > x", "x >= x", "x != x".

> Simplify $x=$x to true
> ----------------------
>
>                 Key: CALCITE-1638
>                 URL: https://issues.apache.org/jira/browse/CALCITE-1638
>             Project: Calcite
>          Issue Type: Improvement
>          Components: core
>            Reporter: Jess Balint
>            Assignee: Julian Hyde
>            Priority: Minor
>             Fix For: 1.12.0
>
>
> {{=}} is reflexive and we can simplify it to true if the operands are equal



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