code: public Criteria size(int size) {
          this.criteriaType = RelationalOperator.SIZE;
          this.right = ValueNode.toValueNode(size);
          return this;
      }
docs: The <code>size</code> operator matches:
  <p/>
  <ol>
  <li>array with the specified number of elements.</li>
  <li>string with given length.</li>
  </ol>
  
  @param size
  @return the criteria