I timed the third line and here are stage timings, collect at SparkPlan.scala:52 ----- 0.5 s mapPartitions at Exchange.scala:58 ----- 0.7 s RangePartitioner at Exchange.Scala:62 ----- 0.7 s RangePartitioner at Exchange.Scala:62 ----- 0.5 s mapPartitions at Exchange.scala:44 ----- 13 s
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