code: public static StringExpression lpad(Expression<String> in, int length, char c) {
          return Expressions.stringOperation(Ops.StringOps.LPAD2, in, ConstantImpl.create(length), ConstantImpl.create(c));
      }
docs: Create a {@code lpad(in, length, c)} expression
  
  <p>Returns in left-padded to length characters with c</p>
  
  @param in string to be padded
  @param length target length
  @param c padding char
  @return lpad(in, length, c)