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From "Owen O'Malley (JIRA)" <>
Subject [jira] [Created] (HIVE-5563) Skip reading columns in ORC for count(*)
Date Wed, 16 Oct 2013 17:11:43 GMT
Owen O'Malley created HIVE-5563:

             Summary: Skip reading columns in ORC for count(*)
                 Key: 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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