Github user HyukjinKwon commented on the issue: https://github.com/apache/spark/pull/19651 @dongjoon-hyun, btw, if I understood correctly, > Note that this PR intentionally removes old ORCFileFormat to demonstrate a complete replacement. We will bring back the old ORCFileFormat and make them switchable in SPARK-20728 we don't necessarily remove the old `sql/hive/src/main/scala/org/apache/spark/sql/hive/orc/OrcFileFormat.scala` itself when it's ready for merging?
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