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https://issues.apache.org/jira/browse/CALCITE-2970?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17077470#comment-17077470
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Julian Hyde commented on CALCITE-2970:
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What if the {{Foo}} convention has an implementation of {{Aggregate}} that is
able to compute expressions on its input, so that you could compute, say,
'sum(x + y)' in one step. You would have a physical rule that converts a
{{FooAggregate}} on top of a {{FooProject}} into a {{FooAggregate}}.
That's a physical rule that does more than just copy {{LogicalAggregate}} to
{{Foo}} convention.
> 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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