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https://issues.apache.org/jira/browse/CALCITE-3008?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16844975#comment-16844975
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Rong Rong commented on CALCITE-3008:
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[~julianhyde] I followed most of your suggestions and tried to create a
{{Rex2RexConverter}} and a {{Rex2RexConvertletTable}}. Please see the details
in https://github.com/apache/calcite/pull/1219. I think the public interface
for the convertlet is something I am still a bit confuse on whether it fits
your description of "add a user-defined function and the ability to convert
it."
Please kindly take a look when you have time.
> Making AuxiliaryConverter Pluggable
> -----------------------------------
>
> Key: CALCITE-3008
> URL: https://issues.apache.org/jira/browse/CALCITE-3008
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Reporter: Rong Rong
> Priority: Major
> Labels: pull-request-available
> Time Spent: 1h
> Remaining Estimate: 0h
>
> Currently the {{AuxiliaryConverter}} in calcite core is set to be static with
> only one basic implementation. It would be nice to have it pluggable so that
> other systems can implement its own.
> Was wondering if this would be a good feature to add?
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