@Override
  public Category getCategory() {
    return Category.STRUCT;
  }
The ArrayWritableObjectInspector will inspect an ArrayWritable, considering it as a Hive struct.<br>
It can also inspect a List if Hive decides to inspect the result of an inspection.
ql/src/java/org/apache/hadoop/hive/ql/io/parquet/serde/ArrayWritableObjectInspector.java