jscheffl commented on issue #36369:
URL: https://github.com/apache/airflow/issues/36369#issuecomment-1913326274
> @jscheffl sorry for the delay. That is a great question, at a high level,
the goal is to create an optional parameter so that code which the DAG calls
can define a default. Without the null option, the parameter must be specified
in the DAG parameters to be able to load the DAG (due to default validation).
Thanks for the detailed explanation @mblakely!
So in my words if I correctly understand you want to define a parameter as
you wrap a DAG around some existing function. That function receives a boolean
parameter but you want to have the option to call also without these parameters.
Is your requirement only "I want to call w/o need to define all parameters"
or is your wrapper required to "I need to distinguish three cases for
boolean=[True,False,None]"?
If you are using `type=["string, "null"]` and `type=["boolean", "null"]`
just to prevent that a caller need to pass all parameter values, then you could
assign just default values like:
```
with DAG(
"process_data"
params={
"image_directory": Param("/path/to/a/shared/directory", type="string"),
"should_parallelize": Param(True, type="boolean")
}
...
```
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