code: private static List<IndexExpression> indexExpressionsFromString(String ie) throws IOException
      {
          assert ie != null;
          TDeserializer deserializer = new TDeserializer(new TBinaryProtocol.Factory());
          IndexClause indexClause = new IndexClause();
          try
          {
              deserializer.deserialize(indexClause, Hex.hexToBytes(ie));
          }
          catch (TException e)
          {
              throw new IOException(e);
          }
          return indexClause.getExpressions();
      }
docs: convert string to a list of index expression