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https://issues.apache.org/jira/browse/CALCITE-2970?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17062341#comment-17062341
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Stamatis Zampetakis commented on CALCITE-2970:
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Nice idea [~hyuan]!! I didn't thoroughly thought about all use-cases but high
level I really like the approach that you took in
[PR#1860|https://github.com/apache/calcite/pull/1860]. For a long time, I was
debating with my self to understand if RelSubset should model "derived" or
"required" traits but I didn't think that it could do both :)
> 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: 3h 40m
> 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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