@Override
  public Writable serialize(Object realRow, ObjectInspector inspector) {
    row.realRow = realRow;
    row.inspector = inspector;
    return row;
  }
NOTE: if {@link serdeConstants#LIST_COLUMN_TYPES} is missing, all columns will be of String type.
ql/src/java/org/apache/hadoop/hive/ql/io/orc/OrcSerde.java