code: @Override
  	public CaseFormat getDefaultMapKeyCaseFormat() {
  		return CaseFormat.valueOf(getDefaultProps().getOrDefault(PROPS_KEY_DEFAULT_MAP_KEY_CASE_FORMAT,
  				CaseFormat.UPPER_SNAKE_CASE.toString()));
  	}
docs: {@inheritDoc}
  
  @see jp.co.future.uroborosql.SqlAgentFactory#getDefaultMapKeyCaseFormat()