[SPARK-27351][SQL] Wrong outputRows estimation after AggregateEstimation with only null value column#24286

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pengbo wants to merge 4 commits intoapache:masterfrom

Commits on Apr 3, 2019

SPARK-27351 Wrong outputRows estimation after AggregateEstimation with only null value column
mingbo_pb
committed

Commits on Apr 11, 2019

merge upstream/master
mingbo_pb
committed

Commits on Apr 12, 2019

check null value count for only null value column
pengbo
committed

Commits on Apr 14, 2019

refine code to make columnStat.distinctCount.get called only once
pengbo
committed