code: public final B addMapping(String column, int index, final ColumnDefinition<K, ?> columnDefinition) {
          return addMapping(key(column, index), columnDefinition);
      }
docs: add a new mapping to the specified property with the specified index, specified property definition and an undefined type.
  
  @param column           the property name
  @param index            the property index
  @param columnDefinition the property definition
  @return the current builder