docs: public <K> SortPartitionOperator<T> sortPartition(KeySelector<T, K> keyExtractor, Order order) {
  		final TypeInformation<K> keyType = TypeExtractor.getKeySelectorTypes(keyExtractor, getType());
  		return new SortPartitionOperator<>(this, new Keys.SelectorFunctionKeys<>(clean(keyExtractor), getType(), keyType), order, Utils.getCallLocationName());
  	}