code: public static <T> ListAppendFunction list_append(String path,
              List<? extends T> value) {
          return new ListAppendFunction(L(path), new ListLiteralOperand(new LinkedList<T>(
                  value)));
      }
docs: Returns a <code>ListAppend</code> object which represents a <a href=
  "http://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Expressions.Modifying.html"
  >list_append(operand, operand)</a> function call; used for building
  expression.
  
  <pre>
  "list_append(operand, operand) – This function evaluates to a list with a
  new element added to it. You can append the new element to the start or
  the end of the list by reversing the order of the operands."
  </pre>
  
  @param path
  document path to a list attribute
  @param value
  list of values to be appended to the list attribute