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[SPARK-12978][SQL] Skip unnecessary final group-by when input data already clustered with group-by keys#10896

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maropu wants to merge 21 commits intoapache:masterfrom
maropu:SkipGroupbySpike
Closed

[SPARK-12978][SQL] Skip unnecessary final group-by when input data already clustered with group-by keys#10896
maropu wants to merge 21 commits intoapache:masterfrom
maropu:SkipGroupbySpike

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