daniel-westerfeld opened a new issue, #45032:
URL: https://github.com/apache/airflow/issues/45032
### Apache Airflow version
Other Airflow 2 version (please specify below)
### If "Other Airflow 2 version" selected, which one?
2.8.2
### What happened?
I am trying to pass a parameter to a DAG using `Param`. I need to pass an
optional list of integers, hence, I tried using `type=['array', 'null'],
items={'type': 'integer'}` with None as default value. However, when I try to
trigger the DAG and add a non-None array of numbers, the JSON config does not
get updated and `null` is passed.
### What you think should happen instead?
The non-empty array of integers should get passed to the DAG.
### How to reproduce
Create a DAG with the mentioned Param, e.g.
```python
from airflow import DAG
from airflow.models.param import Param
default_args = {
'owner': '[email protected]',
'start_date': datetime(2023, 12, 13),
'retries': 1,
'retry_delay': timedelta(minutes=5),
}
with DAG(
'example_dag',
default_args=default_args,
schedule='0 1 * * *',
tags=['news-dags'],
params={
'ids': Param(None, type=['array', 'null'], items={'type': 'number'}),
},
) as example_dag:
...
```
Now try to trigger it with config and add a list of integer IDs. I noted,
that it works when I specify `type='array'` but the default should be `None`.
The behaviour of my DAG differs when `ids` are `None` or an empty list, so
passing `[]` as a default and removing `null` is not an option.
### Operating System
Debian bookworm
### Versions of Apache Airflow Providers
apache-airflow-providers-amazon==8.18.0
apache-airflow-providers-celery==3.6.0
apache-airflow-providers-common-io==1.3.0
apache-airflow-providers-common-sql==1.11.0
apache-airflow-providers-docker==3.9.1
apache-airflow-providers-ftp==3.7.0
apache-airflow-providers-http==4.9.1
apache-airflow-providers-imap==3.5.0
apache-airflow-providers-postgres==5.10.1
apache-airflow-providers-redis==3.6.0
apache-airflow-providers-sqlite==3.7.1
### Deployment
Other Docker-based deployment
### Deployment details
_No response_
### Anything else?
Always when trying to use Param with the mentioned combination.
### Are you willing to submit PR?
- [ ] Yes I am willing to submit a PR!
### Code of Conduct
- [X] I agree to follow this project's [Code of
Conduct](https://github.com/apache/airflow/blob/main/CODE_OF_CONDUCT.md)
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