JkSelf commented on issue #25295: [SPARK-28560][SQL] Optimize shuffle reader to local shuffle reader when smj converted to bhj in adaptive execution URL: https://github.com/apache/spark/pull/25295#issuecomment-530640464 @cloud-fan The specific `ShuffleRDD` is implemented by reading the whole data from one mapper output locally to ensure there is no data transferred from the network.
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