viirya commented on a change in pull request #26809: [SPARK-30185][SQL]
Implement Dataset.tail API
URL: https://github.com/apache/spark/pull/26809#discussion_r355740148
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File path: sql/core/src/main/scala/org/apache/spark/sql/Dataset.scala
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@@ -2770,6 +2770,18 @@ class Dataset[T] private[sql](
*/
def take(n: Int): Array[T] = head(n)
+ /**
+ * Returns the last `n` rows in the Dataset.
Review comment:
Is this `last` only making sense for ordered dataset?
Though `head` also refers to first rows, it can be seen as same as `limit`.
For `last` it seems to be more related to an ordered dataset?
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