AngersZhuuuu commented on issue #24124: [SPARK-27186][SQL] mapPartition to replace map to speedUp Dataset's toLocalIterator process URL: https://github.com/apache/spark/pull/24124#issuecomment-474680663 > That isn't what happens though. toLocalIterator evaluates partitions one by one. Unless you have more info or benchmarks to verify this, this should be closed. But this method will act before other's call Result one partition bay one partition. Decode action is just dong at the same time when call result ?, not prepare data to wait call result?
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