mgaido91 commented on issue #23696: [SPARK-26781][SQL]Avoid additional shuffle when the data is already partitioned on the same key in previous stage URL: https://github.com/apache/spark/pull/23696#issuecomment-459739860 I think this is a duplicate of https://github.com/apache/spark/pull/22957 (SPARK-25951). That patch has been reviewed multiple times and uses a more exhaustive approach than the one showed here. So I'd close this PR and the related JIRA as a duplicate and focus the discussion in the existing thread. Thanks.
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