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https://issues.apache.org/jira/browse/CALCITE-4952?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17462510#comment-17462510
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Stamatis Zampetakis commented on CALCITE-4952:
----------------------------------------------

Thanks for the additional info [~jnadeau] it makes sense. I had a quick look in 
the PR and I do like the fact that you added also tests for the new 
implementation.

> Enable use of RelMetadataQuery using a simplistic & slow proxy path
> -------------------------------------------------------------------
>
>                 Key: CALCITE-4952
>                 URL: https://issues.apache.org/jira/browse/CALCITE-4952
>             Project: Calcite
>          Issue Type: Improvement
>          Components: core
>            Reporter: Jacques Nadeau
>            Assignee: Jacques Nadeau
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> As part of working on CALCITE-4882 and CALCITE-4928, it became clear that 
> there should be a simple, non-janino implementation of RelMetadataQuery 
> internals to help with debugging. I'm not sure when/how but as of right now 
> the Reflective handlers can't be used with RelMetadataQuery without also 
> using Janino.



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