srowen 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-474654550 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.
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