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From "Owen O'Malley (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HIVE-11808) In ORC removing the dynamic dispatch for StringTreeReader improves read by 10%
Date Sun, 13 Sep 2015 16:25:46 GMT
Owen O'Malley created HIVE-11808:
------------------------------------

             Summary: In ORC removing the dynamic dispatch for StringTreeReader improves read
by 10%
                 Key: HIVE-11808
                 URL: https://issues.apache.org/jira/browse/HIVE-11808
             Project: Hive
          Issue Type: Bug
            Reporter: Owen O'Malley
            Assignee: Owen O'Malley


When we introduced the dictionary/direct encodings for ORC, we made subclasses of StringTreeReader
named StringDirectTreeReader and StringDictionaryTreeReader and introduce an additional dynamic
dispatch in the inner loop. For tables with a lot of string columns, removing that extra dispatch
improves performance 10%.



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