Github user bersprockets commented on the issue: https://github.com/apache/spark/pull/21073 @ueshin Hopefully I have addressed all of your review comments. Also, I have a question about what it means to dedup across maps when Spark allows duplicates in maps [here.](https://issues.apache.org/jira/browse/SPARK-23936?focusedCommentId=16464245&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-16464245)
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