code: private static Object stringTypeToPig(Object value) {
      if (value instanceof String) {
        return value;
      }
      if (value instanceof byte[]) {
        byte[] buf = (byte[])value;
        return new DataByteArray(Arrays.copyOf(buf, buf.length));
      }
      if (value instanceof ByteBuffer) {
        ByteBuffer bin = (ByteBuffer)value;
        byte[] buf = new byte[bin.remaining()];
        bin.mark();
        bin.get(buf);
        bin.reset();
        return new DataByteArray(buf);
      }
      return null;
    }
docs: TType.STRING is a mess in Thrift. It could be byte[], ByteBuffer,
  or even a String!.