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https://issues.apache.org/jira/browse/CALCITE-1220?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15454520#comment-15454520
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Jesus Camacho Rodriguez commented on CALCITE-1220:
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You are right, I did not even realize, I should have used _set_.
> Further extend simplify for reducing expressions
> ------------------------------------------------
>
> Key: CALCITE-1220
> URL: https://issues.apache.org/jira/browse/CALCITE-1220
> Project: Calcite
> Issue Type: Bug
> Components: core
> Reporter: Jesus Camacho Rodriguez
> Assignee: Jesus Camacho Rodriguez
> Fix For: 1.9.0
>
>
> We would extend expression simplification, e.g.:
> - add walker to perform recursive simplification of expressions for Filter
> operators, and
> - extends simplification for CASE expressions to cover more cases e.g. if all
> return values are equal (including ELSE), CASE can be removed
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