docs: public java.io.InputStream getAsciiStream(
              int columnIndex) throws SQLException {
  
          String s = getString(columnIndex);
  
          if (s == null) {
              return null;
          }
  
          try {
              return new ByteArrayInputStream(s.getBytes("US-ASCII"));
          } catch (IOException e) {
              return null;
          }
      }