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https://issues.apache.org/jira/browse/CALCITE-1638?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15869106#comment-15869106
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Julian Hyde commented on CALCITE-1638:
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As it happens I've already done this, as part of
https://github.com/julianhyde/calcite/commit/c8e266521328a115e2075aea335ae655c099f8a8.
The correct rewrite IMHO is "$x = $x" → "$x is not null". (And the latter
will get simplified to true if x is not null.) I'll commit it as part of the
fix for CALCITE-1494.
> 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
>
> {{=}} is reflexive and we can simplify it to true if the operands are equal
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