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https://issues.apache.org/jira/browse/CALCITE-2970?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16977209#comment-16977209
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Stamatis Zampetakis commented on CALCITE-2970:
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In my mind I was thinking that if you have multiple target traits then the each 
rule is going to his part. XSortRule will handle the collation trait and 
XExchangeRule the distribution trait. I agree with you that creating all the 
possible combinations of rules is not a good idea.

> 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 50m
>  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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