@Override
  public Object deserialize(Writable blob) throws SerDeException {
    return ((BytesWritable) blob).getBytes();
  }
Return the bytes from this writable blob.
Eventually the client of this method will interpret the byte using the Thrift Protocol
serde/src/java/org/apache/hadoop/hive/serde2/thrift/ThriftJDBCBinarySerDe.java