windpiger commented on issue #24215: [SPARK-27229][SQL] GroupBy Placement in Intersect Distinct URL: https://github.com/apache/spark/pull/24215#issuecomment-476931064 > Could this lead to performance regressions if the group by doesn't have reduction? Here provide a switch to turn it of/on ( default is false). It is better to do this by cost driven.
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