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https://issues.apache.org/jira/browse/CALCITE-2862?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16775937#comment-16775937
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Rong Rong commented on CALCITE-2862:
------------------------------------
Thanks for the quick reply [~kgyrtkirk] :-). as you mentioned in the JIRA yeah
this doesn't seem to be limited to just to UDFs I will try some test and will
close as duplicate if our problem is resolved by your patch.
> Deprecated ExprSimplifier causes some operands not being simplified
> -------------------------------------------------------------------
>
> Key: CALCITE-2862
> URL: https://issues.apache.org/jira/browse/CALCITE-2862
> Project: Calcite
> Issue Type: Bug
> Components: core
> Reporter: Rong Rong
> Priority: Major
>
> This might not be a bug or the original intention of CALCITE-2726 since it is
> not part of the [PR|https://github.com/apache/calcite/pull/956/files].
> The reduction of ExprSimplifier (RexShuttle) actually causes some of the
> chained operations not being simplified. For example:
> {code:java}
> AS(
> +(
> someAggFunc($2, $0),
> CAST(1):BIGINT NOT NULL
> ),
> someName'
> )
> {code}
> Somehow did not get simplified (e.g. the CAST(1) still remains instead of
> being simplified as a Literal.
> My initial feeling is that {{AS}} is not one of the kinds in the case-switch
> code in RexSimplify.
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