revans2 commented on issue #25499: [SPARK-28774] [SQL] Fix exchange reuse for columnar data URL: https://github.com/apache/spark/pull/25499#issuecomment-523026985 @kiszk @cloud-fan @HyukjinKwon I added in a simple unit test that fails without the changes and passes with them. I didn't go the route of creating a full columnar exchange because that is a lot of code and instead I just verified that the correct code path is being executed.
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