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https://issues.apache.org/jira/browse/CALCITE-3318?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16952394#comment-16952394
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Julian Hyde commented on CALCITE-3318:
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Minor quibble: string is not a SQL type, so why is STRING capitalized in the
summary? Also, the summary does not make it clear what you regard as the
desired behavior.
> Preserving CAST of STRING operands in comparison operator
> ---------------------------------------------------------
>
> Key: CALCITE-3318
> URL: https://issues.apache.org/jira/browse/CALCITE-3318
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.20.0
> Reporter: Soma Mondal
> Priority: Major
> Labels: pull-request-available
> Time Spent: 2h 40m
> Remaining Estimate: 0h
>
> We have a REL which has this information
> select * from employee where employee_id = cast('12' as float);
> but Calcite removes the CAST from the STRING literal('12' in our case).
> select * from employee where employee_id = '12';
> There are dialects which needs explicit casting in the above case and we need
> to maintain the CAST in our dialect.
> Calcite removes the cast in SqlImplementor's stripCastFromString() method.
> I'm thinking of having the dialect intercept this and decide whether or not
> to remove the cast.
>
> I have created a PR [https://github.com/apache/calcite/pull/1437]
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