public byte getSeparator() {
    return separator;
  }
LazyUnionObjectInspector works on union data that is stored in LazyUnion.

Always use the {@link LazyObjectInspectorFactory} to create new
ObjectInspector objects, instead of directly creating an instance of this
class.
serde/src/java/org/apache/hadoop/hive/serde2/lazy/objectinspector/LazyUnionObjectInspector.java