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https://issues.apache.org/jira/browse/CALCITE-2970?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16962538#comment-16962538
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Julian Hyde commented on CALCITE-2970:
--------------------------------------

bq. In order to achieve that, the framework would need to provide a way to 
create a physical node with given convention not through user rules. I don't 
have a clear solution in my mind. I think this will be an important enhancement 
to the calcite framework.

I agree this is needed. It has come up before, and we haven't solved it yet. 
One idea is CALCITE-2064.

> 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: 1h 20m
>  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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