Github user maropu commented on a diff in the pull request: https://github.com/apache/spark/pull/21857#discussion_r204758133 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/Dataset.scala --- @@ -1919,6 +1919,21 @@ class Dataset[T] private[sql]( Except(planWithBarrier, other.planWithBarrier) } + /** + * Returns a new Dataset containing rows in this Dataset but not in another Dataset while + * preserving the duplicates. + * This is equivalent to `EXCEPT ALL` in SQL. + * + * @note Equality checking is performed directly on the encoded representation of the data + * and thus is not affected by a custom `equals` function defined on `T`. + * + * @group typedrel + * @since 2.4.0 --- End diff -- The feature freeze will come soon, so I'm not sure this will appear in v2.4. cc: @gatorsmile @rxin
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