Github user nsyca commented on the issue:
https://github.com/apache/spark/pull/14719
@sarutak, my apologies if this will upset you. I'd like to propose an
alternative solution to the problems documented in SPARK-13801, 14040, 17337
and, here, 17154. The solution borrows the idea from the dedupRight code but
generalize it. I will post an attachment in the JIRA for you and all interest
parties including reviewers to read through.
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