code: @SuppressWarnings("unchecked")
      public NumberExpression<T> max() {
          if (max == null) {
              max = Expressions.numberOperation(getType(), Ops.AggOps.MAX_AGG, mixin);
          }
          return max;
      }
docs: Create a {@code max(this)} expression
  
  <p>Get the maximum value of this expression (aggregation)</p>
  
  @return max(this)