code: public static DefaultValueFunction defaultValue(Field field, Object defaultValue) {
  
  		Assert.notNull(field, "Field must not be 'null' for default value operation.");
  
  		return new DefaultValueFunction(field, defaultValue);
  	}
docs: Creates new {@link DefaultValueFunction} representing {@code def(field.getName(), defaultValue))}
  
  @param field must not be null
  @param defaultValue must not be null
  @return