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https://issues.apache.org/jira/browse/CALCITE-2970?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17085312#comment-17085312
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Julian Hyde commented on CALCITE-2970:
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Rather than {{RelBuilder getRelBuilder(RelOptCluster)}} how about
{{UnaryOperator<RelBuilder> getRelBuilderTransform()}}? The transform would
take an existing {{RelBuilder}} and switch it to use the convention.
Rationale:
* Conventions are static - i.e. created before queries - and therefore they
probably don't have the resources to create a RelBuilder.
* And Conventions they work by creating a RelBuilder, that won't compose with
some other component that works by creating a RelBuilder.
> 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: 13h 10m
> 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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