Github user yhuai commented on the pull request:
https://github.com/apache/spark/pull/1390#issuecomment-48860018
@chenghao-intel I am not sure I understand your comment on column pruning.
I think for a Hive table, we should use `ColumnProjectionUtils` to set needed
columns. So, RCFile and ORC can just read needed columns from HDFS.
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