cloud-fan commented on issue #23387: [SPARK-26447][SQL]Allow OrcColumnarBatchReader to return less partition columns URL: https://github.com/apache/spark/pull/23387#issuecomment-450144530 LGTM. How would you add test? IIUC this is just a code refactor now, nothing will be changed. It will become a real optimization when migrating orc to v2 API.
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