code: public int isNullable(final int column) throws SQLException {
      if ((getColumnInformation(column).getFlags() & ColumnFlags.NOT_NULL) == 0) {
        return ResultSetMetaData.columnNullable;
      } else {
        return ResultSetMetaData.columnNoNulls;
      }
    }
docs: Indicates the nullability of values in the designated column.
  
  @param column the first column is 1, the second is 2, ...
  @return the nullability status of the given column; one of <code>columnNoNulls</code>,
  <code>columnNullable</code> or <code>columnNullableUnknown</code>
  @throws SQLException if a database access error occurs