Add ColumnarSerDe to the list of native SerDes
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                 Key: HIVE-2322
                 URL: https://issues.apache.org/jira/browse/HIVE-2322
             Project: Hive
          Issue Type: Bug
          Components: Metastore, Serializers/Deserializers
            Reporter: Sohan Jain
            Assignee: Sohan Jain


We store metadata about ColumnarSerDes in the metastore, so it should be 
considered a native SerDe.  Then, column information can be retrieved from the 
metastore instead of from deserialization.

Currently, for non-native SerDes, column comments are only shown as "from 
deserializer".  Adding ColumnarSerDe to the list of native SerDes will persist 
column comments.  See HIVE-2171 for persisting the column comments of custom 
SerDes.

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