cloud-fan commented on issue #23057: [SPARK-26078][SQL] Dedup self-join attributes on IN subqueries URL: https://github.com/apache/spark/pull/23057#issuecomment-451217862 also cc @dongjoon-hyun @HyukjinKwon IIRC there were some refactorings about subquery rewrite, not sure how hard it is to backport to 2.2.
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