docs: public static Tuple<String, String> split(String strColumn, String pattern, String valueName) {
          String name = "split_" + random();
          if (valueName == null) {
              return new Tuple(name, "def " + name + " = doc['" + strColumn + "'].value.split('" + pattern + "')" );
          } else {
              return new Tuple(name, strColumn + "; def " + name + " = " + valueName + ".split('" + pattern + "')");
          }
  
      }