Github user YuhuWang2002 commented on the issue:
https://github.com/apache/spark/pull/15297
@tgravescs : In join case,some like : select count(*) from A join B. if
the parameter spark.sql.shuffle.partitions=200 ,then we get 200 tasks output
about 'count num', the output is not in HDFS but cache in spark . Calculate the
sum of 200 tasks. we got the correct value. If skewed. wo get 210 tasks
output about 'count num'. it's some processing about next step.
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