private String convertPrimitiveType(TypeDescription fieldType) {
    if (fieldType.getCategory().getName().equals(serdeConstants.TIMESTAMPLOCALTZ_TYPE_NAME)) {
      throw new IllegalArgumentException("Unhandled ORC type " + fieldType.getCategory().getName());
    }
    return fieldType.toString();
  }
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