AIP-84 | Add multisort to dags list request

[bbovenzi]

In the UI, we default the dags list to show dags with the latest dag run first , which we pass as -last_dag_run_start_date. Problem is that the minus symbol seems to make the default sorts also reverse so any dags without a dag run will be in reverse alphabetical order which is counterintuitive for users.
If you reverse the dag run start date order, it will also change the alphabetical order.

[pierrejeambrun]

Nice. For now the dag_id (name) is always used as the secondary sort criteria to ensure stability in the result set returned. (In case the primary criteria has identical values).

When we use a descending sort, the secondary filter (which is the primary key of the table, here the dag_id is also .desc()).

In the following code column is the primary sort criteria, the one specified by the user. primary_key_column is the secondary sort criteria always used and retrieved from the models.

airflow/airflow/api_fastapi/common/parameters.py

Lines 202 to 205 in ee6bd7e

	if self.value[0] == "-":
	return select.order_by(nullscheck, column.desc(), primary_key_column.desc())
	else:
	return select.order_by(nullscheck, column.asc(), primary_key_column.asc())

I think we need to support multisort to be able to handle this case. Users would be able to specify that they want to sort on the primary criteria in asc(), but on a secondary criteria in desc() order for intance. (Or any other arbitrary combination).

[Vishnu-sai-teja]

Hey can work on this.

[pierrejeambrun]

Great, assigned !

[prasad-madine]

Hello @pierrejeambrun, Are both front-end and back-end changes being done by the assignee?

[pierrejeambrun]

Hello @prasad-madine, I assume so.

We need the backend contribution to start working on the front-end anyway.

@Vishnu-sai-teja any progress ? Do you have plan on following up with the front-end changes as well ?

[Vishnu-sai-teja]

Hey out of town, haven't started on it yet, Sorry I should have informed earlier