Change weight priority type from Integer to Float

[Taragolis]

Change task_instance.priority_weight type from int to float

Alternatives:

• Hard limit priority weight total by int32 value #38125
• Validate tasks total priority weight in DagBag #37990

---

^ Add meaningful description above
Read the Pull Request Guidelines for more information.
In case of fundamental code changes, an Airflow Improvement Proposal (AIP) is needed.
In case of a new dependency, check compliance with the ASF 3rd Party License Policy.
In case of backwards incompatible changes please leave a note in a newsfragment file, named {pr_number}.significant.rst or {issue_number}.significant.rst, in newsfragments.

[Taragolis]

In case of overflow int32 (MySQL/Postgres) and presumably int64 in SQLite it will raise an error

Example of Postgres error

 File "/usr/local/lib/python3.8/site-packages/sqlalchemy/engine/default.py", line 736, in do_execute cursor.execute(statement, parameters)sqlalchemy.exc.DataError: (psycopg2.errors.NumericValueOutOfRange) integer out of range[SQL: ALTER TABLE task_instance ALTER COLUMN priority_weight TYPE INTEGER ](Background on this error at: https://sqlalche.me/e/14/9h9h)

[potiuk]

I don't think we can prevent that easily - and I'd say it's an edge case of an edge-case

[Taragolis]

Check on backend before save it into the DB 🤣

[potiuk]

That indeed looks much simpler :)

[Taragolis]

That indeed looks much simpler :)

I have an opposite opinion about it

[Taragolis]

Closed it should be implemented in top of the #38222
In addition changing type of weighted sum affects different parts, include executors.