public String getFieldComment() {
      return fieldComment;
    }
ListStructObjectInspector works on struct data that is stored as a Java List
or Java Array object. Basically, the fields are stored sequentially in the
List object.

The names of the struct fields and the internal structure of the struct
fields are specified in the ctor of the StructObjectInspector.

Always use the ObjectInspectorFactory to create new ObjectInspector objects,
instead of directly creating an instance of this class.
serde/src/java/org/apache/hadoop/hive/serde2/objectinspector/StandardStructObjectInspector.java