Github user maropu commented on a diff in the pull request: https://github.com/apache/spark/pull/20800#discussion_r175039379 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/Dataset.scala --- @@ -511,6 +511,14 @@ class Dataset[T] private[sql]( */ def isLocal: Boolean = logicalPlan.isInstanceOf[LocalRelation] + /** + * Returns true if the `Dataset` is empty. + * + * @group basic + * @since 2.4.0 + */ + def isEmpty: Boolean = rdd.isEmpty() --- End diff -- How about this? ``` def isEmpty: Boolean = withAction("isEmpty", groupBy().count().queryExecution) { plan => plan.executeCollect().head.getLong(0) == 0 } ```
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