Github user habren commented on the issue:
https://github.com/apache/spark/pull/21868
@maropu Thanks for your comments. ORC can also benefit from this change
since ORC is also columnar file format. Do you think I should add ORC support
by change the below line
` if(fsRelation.fileFormat.isInstanceOf[ParquetSource]`
to
`if(fsRelation.fileFormat.isInstanceOf[ParquetSource] ||
if(fsRelation.fileFormat.isInstanceOf[OrcFileFormat]`
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