godfreyhe edited a comment on issue #10694: [FLINK-15381] [table-planner-blink] correct collation derive logic on RelSubset in RelMdCollation URL: https://github.com/apache/flink/pull/10694#issuecomment-570124600 > I'm agreed with you. > However it's unsafe to throw exception in the else branch. `FlinkRelMdUniqueKeys` and `FlinkRelMdUniqueGroups` also throw exception for this case and there are many test cases will fail once CALCITE_1048 is fixed
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