Separate dag/task UI display name from dag / task id

[EricGao888]

Description

• Enable users to use their national characters, which are usually non-ASCIIs as the display name of their dags / tasks.

Use case/motivation

• At present, only ASCIIs are allowed for dag_id and task_id as shown in this comment.
• However, in many cases, users would like to use their national characters for their dag_ids and task_ids, which apparently leads to some existing issues, related: Fail to download task log if there are Chinese characters in dag_id #21127, Airflow scheduler with statsd enabled crashes when dag_id contains unexpected characters #18010
• Enabling non-ASCII dag_id / task_id would be a great idea to solve these issues as commented here
• For a quick fix, maybe we could add a new optional field display_name for both dag and task.
• Considering backward compatibility, dag_id or task_id will be used as UI display name if the field display_name is None.

UPDATE (by @potiuk):

• any solution to this one should also include possibility of specifying names for dynamically mapped tasks (individually - per mapped index id)

Related issues

related: #21127
related: #18010
related: #23020

Are you willing to submit a PR?

• Yes I am willing to submit a PR!

Code of Conduct

• I agree to follow this project's Code of Conduct

[potiuk]

I think it's a good feature to have. I hope someone would like to pick it up.

[potiuk]

IMHO it is much better (and simpler to implement) than allowing non-ASCII characters for IDs (which is an alternative way of implementing it).

[EricGao888]

I think it's a good feature to have. I hope someone would like to pick it up.

I'd like to take a look into this : )

[HugoCornu]

Separating task_id and task display name would allow to have several similar tasks showing the same name.
This would be extremly useful in the context of hyperparameter optimisation.

[potiuk]

Sure.Anyone is free to submit PR s imeplementing it @HugoCornu - yourself including.

[koroder]

@potiuk I am looking to make my first contribution to Airflow. Would it be okay if I work on this issue?

[EricGao888]

@potiuk I am looking to make my first contribution to Airflow. Would it be okay if I work on this issue?

@koroder It's totally fine from my perspective. As currently I'm busy with another project. Thx.

[EricGao888]

@potiuk I am looking to make my first contribution to Airflow. Would it be okay if I work on this issue?

@koroder BTW, you may directly start from this PR if you'd like to. #22118

[koroder]

Awesome! This is really helpful - I will take it from here.

[potiuk]

Following up from the discussion in #23020 - this feature should also include naming of mapped tasks.