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https://issues.apache.org/jira/browse/CALCITE-6025?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17768875#comment-17768875
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Julian Hyde commented on CALCITE-6025:
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I don't think we should simplify DECODE. Why? I think of DECODE as syntactic
sugar for CASE. As such, simplify should work on the CASE expression that has
been created from DECODE. If generating SQL for a dialect that supports DECODE,
we could convert CASE back to DECODE.
> Simplify DECODE function
> ------------------------
>
> Key: CALCITE-6025
> URL: https://issues.apache.org/jira/browse/CALCITE-6025
> Project: Calcite
> Issue Type: Improvement
> Reporter: Wenzhuang Zhu
> Assignee: Wenzhuang Zhu
> Priority: Minor
>
> RexSimplify.simplify supports COALESCE and CASE, but DECODE is not supported.
>
> DECODE function: decode(<expression>, <search>, <result>[, <search>,
> <result>]...[, <default>])
>
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