pengbo commented on issue #24286: [SPARK-27351][SQL] Wrong outputRows estimation after AggregateEstimation wit… URL: https://github.com/apache/spark/pull/24286#issuecomment-482092917 > > except when the column is all null? distinct would return 0 rows? > > Seems like so. Can we check the null count to make sure it's an all-null column? You mean define "all null value" is not only the distinct value equals to 0 but also with null count is greater than 0?
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