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https://issues.apache.org/jira/browse/CALCITE-1638?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15869120#comment-15869120
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Julian Hyde commented on CALCITE-1638:
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Correction: The correct rewrite is "$x = $x" → "case when $x is not null
then true else unknown end". But in most cases unknown and false have the same
effect.
By the way. I don't have a firm ETA when that commit will be pushed to master.
If you want to extract just the parts related to the "$x = $x" rewrite
(including the tests I added) and commit separately, be my guest.
> 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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