zhztheplayer commented on issue #1087: [CALCITE-1172] Add rule to flatten two Aggregate operators into one URL: https://github.com/apache/calcite/pull/1087#issuecomment-480122659 Thank you for the explanation! I think It is indeed hacky to transform the COUNT to something nullable. So I'm with you in general. Maybe there is possibility to apply optimization to `SUM0(empty group)-COUNT(empty group)` relation, but the algebras seems to be rarely produced by SQL so it is likely not a very important case.
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