rxin commented on issue #24795: [SPARK-27945][SQL] Minimal changes to support columnar processing URL: https://github.com/apache/spark/pull/24795#issuecomment-499938442 I'm suggesting breaking this into two changes: first change is columnar interface (this physical plan perhaps takes columns and generates columns); second change is create a converter operator. You shouldn't need the optimizer changes or the reference counting changes, or the expression changes...
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