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https://issues.apache.org/jira/browse/CALCITE-7227?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18029937#comment-18029937
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Zhen Chen commented on CALCITE-7227:
------------------------------------

This scenario is similar to ours: we rely on Calcite and have overridden 
certain logic in the StandardConvertletTable through code modifications. 
However, implementing something like RexRule in a manner similar to RelRule 
would require significant effort. However, refactoring the 
StandardConvertletTable to make it flexible and configurable is a fantastic 
idea.

> There is no way to modify the StandardConvertletTable
> -----------------------------------------------------
>
>                 Key: CALCITE-7227
>                 URL: https://issues.apache.org/jira/browse/CALCITE-7227
>             Project: Calcite
>          Issue Type: Wish
>          Components: core
>    Affects Versions: 1.40.0
>            Reporter: Mihai Budiu
>            Priority: Minor
>
> The convertlet table has a lot of functionality, but there is no easy way to, 
> let's say, exclude one of the conversions that is undesirable. Copying and 
> modifying the whole class is a solution, but it is not great. Adding new 
> conversions seems possible, but excluding the existing ones seems impossible.



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