Github user dongjoon-hyun commented on the issue: https://github.com/apache/spark/pull/19470 Ya, that was my question, too. - What kind of difference does Spark support, especially in ORC? Apache Spark only supports HiveFileFormat so far, not old OrcFileFormat. - In addition, there is no Schema Merging. Randomly (usually the bigging ORC file?), the first correct ORC file schema is used now. For old ORC cases, those are meaningless like `_colX`. For me, HiveMetastore schema is the only valid one in Apache Spark.
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