cloud-fan commented on issue #26809: [SPARK-30185][SQL] Implement Dataset.tail API URL: https://github.com/apache/spark/pull/26809#issuecomment-564023159 I think it makes sense to support top-level tail which doesn't need shuffle, like limit (see `CollectLimitExec.executeCollect`). But I agree with @HeartSaVioR that once this is in the middle and you need a shuffle, then tail and limit has no difference.
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