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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