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https://issues.apache.org/jira/browse/CALCITE-2970?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17077497#comment-17077497
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Julian Hyde commented on CALCITE-2970:
--------------------------------------

[~hyuan], That logical transformation is not possible, because LogicalAggregate 
does not have slots to represent the input RexNodes. This physical operator -- 
a hybrid of Project and Aggregate -- does not exist in Logical-land. So the 
rewrite has to happen in Foo-land.

> Performance issue when enabling abstract converter for EnumerableConvention
> ---------------------------------------------------------------------------
>
>                 Key: CALCITE-2970
>                 URL: https://issues.apache.org/jira/browse/CALCITE-2970
>             Project: Calcite
>          Issue Type: Bug
>          Components: core
>            Reporter: Haisheng Yuan
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 12h
>  Remaining Estimate: 0h
>
> If we enable the use of abstract converter for {{EnumerableConvention}}, by 
> making {{useAbstractConvertersForConversion}} return true, 
> {{JDBCTest.testJoinManyWay}} will not complete.



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