hsyuan commented on issue #1884: [CALCITE-2970] Performance issue when enabling abstract converter for EnumerableConvention URL: https://github.com/apache/calcite/pull/1884#issuecomment-605374657 Generally, this approach try to utilize current infrastructure like RelBuilder and Factories as much as possible, I am good with the direction. One of my concern is how do we keep its compatibility, like changing an interface `RelBuilderFactory` to a concrete class.
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