code: public <T> DiscriminatorJdbcBuilder<T> newDiscriminator(String column) {
          ignorePropertyNotFound();
          addColumnDefinition(column, FieldMapperColumnDefinition.<JdbcColumnKey>ignoreDefinition());
          return new DiscriminatorJdbcBuilder<T>(column, this);
      }
docs: Create a discriminator builder based on the specified property
  @param column the discriminator property
  @param <T> the root type of the jdbcMapper
  @return a builder to specify the type mapping