static String getColumnNamesProperty() {
      return "myint,mylong,mytext,myfloat,mydouble,ROW__ID";
    }
Test the OrcRecordUpdater with the OrcRawRecordMerger when there is
a base and a delta.
@throws Exception
ql/src/test/org/apache/hadoop/hive/ql/io/orc/TestOrcRawRecordMerger.java