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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