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[SPARK-21410][CORE] Create less partitions for RangePartitioner if RDD.count() is less than partitions#18631

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apapi:fixRangePartitioner.numPartitions
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[SPARK-21410][CORE] Create less partitions for RangePartitioner if RDD.count() is less than partitions#18631
apapi wants to merge 1 commit intoapache:masterfrom
apapi:fixRangePartitioner.numPartitions