code: public static StringExpression rpad(Expression<String> in, Expression<Integer> length) {
          return Expressions.stringOperation(Ops.StringOps.RPAD, in, length);
      }
docs: Create a {@code rpad(in, length)} expression
  
  <p>Returns in right-padded to length characters</p>
  
  @param in string to be padded
  @param length target length
  @return rpad(in, length)