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From "Mark Wagner (JIRA)" <j...@apache.org>
Subject [jira] [Created] (ORC-54) Evolve schemas based on field name rather than index
Date Fri, 20 May 2016 22:44:12 GMT
Mark Wagner created ORC-54:
------------------------------

             Summary: Evolve schemas based on field name rather than index
                 Key: ORC-54
                 URL: https://issues.apache.org/jira/browse/ORC-54
             Project: Orc
          Issue Type: Improvement
            Reporter: Mark Wagner


Schema evolution as it stands today allows adding fields to the end of schemas or removing
them from the end. However, because it is based on the index of the column, you can only ever
add or remove -- not both.

ORC files have the full schema information of their contents, so there's actually enough metadata
to support changing columns anywhere in the schema.



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