HyukjinKwon 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-495373741 I am sorry @dongjoon-hyun. It's my big mistake I apolosise that I rushed. Let me open a PR to revert next time. Can you revert my revert right away or open a PR to revert mine? It shouldn't say the row count is 0 cuz null can be grouped as well.
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