Github user viirya commented on a diff in the pull request: https://github.com/apache/spark/pull/21857#discussion_r205560454 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/Dataset.scala --- @@ -1947,6 +1947,21 @@ 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. --- End diff -- I think it is good to mention `resolves columns by position (not by name)` here too.
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