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From "Prasanth Jayachandran (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HIVE-14310) ORC schema evolution should not completely disable PPD
Date Thu, 21 Jul 2016 22:52:20 GMT
Prasanth Jayachandran created HIVE-14310:
--------------------------------------------

             Summary: ORC schema evolution should not completely disable PPD
                 Key: HIVE-14310
                 URL: https://issues.apache.org/jira/browse/HIVE-14310
             Project: Hive
          Issue Type: Bug
    Affects Versions: 2.2.0
            Reporter: Prasanth Jayachandran
            Assignee: Prasanth Jayachandran
            Priority: Critical


Follow up for HIVE-14214 which completely shuts off PPD when there is any schema evolution.
Some evolutions are safer for PPD like

byte -> short -> int -> long
float -> double
 conversions between char, varchar and strings

For all other conversions we can disable PPD for that specific column that has evolved by
returning TruthValue.YES_NO



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