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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:
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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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