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Posted to dev@hive.apache.org by "Owen O'Malley (JIRA)" <ji...@apache.org> on 2013/10/16 19:11:43 UTC

[jira] [Created] (HIVE-5563) Skip reading columns in ORC for count(*)

Owen O'Malley created HIVE-5563:
-----------------------------------

             Summary: Skip reading columns in ORC for count(*)
                 Key: HIVE-5563
                 URL: https://issues.apache.org/jira/browse/HIVE-5563
             Project: Hive
          Issue Type: Bug
          Components: File Formats
            Reporter: Owen O'Malley


With HIVE-4113, the semantics of ColumnProjectionUtils.getReadColumnIds was fixed so that an empty list means no columns instead of all columns. (Except the caveat of the override of ColumnProjectionUtils.isReadAllColumns.)

However, ORC's reader wasn't updated so it still reads all columns.



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