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https://issues.apache.org/jira/browse/CALCITE-6310?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17851344#comment-17851344
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Julian Hyde commented on CALCITE-6310:
--------------------------------------

Calcites overload resolution could or should be good enough to choose between 
the two forms. Maybe it should be less eager to convert types. 

Postgres manages with a single operator and Calcite should be able to do the 
same. 

I suggest that you look into fixing the overload resolution logic. 

> Add REGEXP_REPLACE function (enabled in PostgreSQL library)
> -----------------------------------------------------------
>
>                 Key: CALCITE-6310
>                 URL: https://issues.apache.org/jira/browse/CALCITE-6310
>             Project: Calcite
>          Issue Type: Sub-task
>            Reporter: James Duong
>            Assignee: James Duong
>            Priority: Minor
>              Labels: pull-request-available
>
> * There is an existing implementation.
>  * PostgreSQL requires supporting an optional extra flags argument



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