srowen commented on issue #24286: [SPARK-27351][SQL] Wrong outputRows estimation after AggregateEstimation wit… URL: https://github.com/apache/spark/pull/24286#issuecomment-482079923 To paraphrase for someone who doesn't know this code well: normally there's no way to have >0 rows but 0 distinct rows... except when the column is all null? distinct would return 0 rows? then a groupBy on that column still returns 1 grouping for that column?
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