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https://issues.apache.org/jira/browse/CALCITE-7287?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18037649#comment-18037649
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Steve Carlin commented on CALCITE-7287:
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[~xuzifu666] I think you committed this code in 1.41?
I haven't figured out how to repro this for you because I don't know the
Calcite test environment that well, but hopefully my explanation of the problem
will help. If you make the original RexLiteral with a RelDataType of type
varchar, this is allowed. Then running it through the simplifier, this type
gets lost.
> In simplifyLike, the makeLiteral call does not preserve the RelDataType
> -----------------------------------------------------------------------
>
> Key: CALCITE-7287
> URL: https://issues.apache.org/jira/browse/CALCITE-7287
> Project: Calcite
> Issue Type: Bug
> Affects Versions: 1.41.0
> Reporter: Steve Carlin
> Priority: Major
>
> In my Calcite code, I have a RexLiteral that is of type RelDataType.VARCHAR
> (the SqlTypeName is always CHAR)
> However, this information is getting lost in the call here
> [https://github.com/apache/calcite/blob/main/core/src/main/java/org/apache/calcite/rex/RexSimplify.java#L527]
> The result of this simplification gives me a RelDataType.CHAR instead.
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