Github user dongjoon-hyun commented on the pull request:
https://github.com/apache/tajo/pull/476#issuecomment-87411421
Rebased and added error handling cases according to the discussion
https://issues.apache.org/jira/browse/TAJO-29.
When selecting non-empty ORCFile table, return IOException instead of NPE.
I think this is more general error handling way rather than throwing
NotImplementedException for a new specific storage type.
By the way, I welcome any feedback for the way of error handling.
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