gatorsmile commented on issue #24286: [SPARK-27351][SQL] Wrong outputRows estimation after AggregateEstimation with only null value column URL: https://github.com/apache/spark/pull/24286#issuecomment-485349060 Thanks for your reviews! A general comment about the code review. We should try our best to improve the test coverage for the unit tests. This PR basically exposes one of the scenarios we missed before. Thus, we should try to ask the contributors to improve the other similar cases too.
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