/** Deserialize an unknown InferredType from the given input stream */
 public static InferredType readType(DataInput in) throws IOException {
   InferredType it = null;
   byte b = in.readByte();
   String name = in.readUTF();
   if (b == BASE_TYPE) {
     it = new BaseType(name);
   } else if (b == STRUCT_TYPE) {
     it = new StructType(name);
   } else if (b == ARRAY_TYPE) {
     it = new ArrayType(name);
   } else if (b == UNION_TYPE) {
     it = new UnionType(name);
   } else {
     throw new IOException("No type found: " + b);
   }
   it.readFields(in);
   return it;
 }
 public void readFields(DataInput in) throws IOException {
   leftBigram = new Text(in.readUTF());
   rightBigram = new Text(in.readUTF());
 }