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A few changes to the external data source thrift types: * Change RowBatch to return entire columns. Adds Data.TColumnData to represent an entire column. * Makes all fields in ExternalDataSource (except for status fields on the result structures) optional in case fields become deprecated in the future. * Adds a limit parameter to the TOpenParams structure in case the data source needs to apply the limit itself. Change-Id: I62db68bfb64d2190dfdd0c84be5925ad5db031ef Reviewed-on: http://gerrit.ent.cloudera.com:8080/2345 Reviewed-by: Nong Li <nong@cloudera.com> Tested-by: jenkins (cherry picked from commit faf220d628359be1368f898493900fc2e2913c53) Reviewed-on: http://gerrit.ent.cloudera.com:8080/2385 Reviewed-by: Matthew Jacobs <mj@cloudera.com>