yang

Fix wrong use of $ref and nullable

1

### Composed schemas `$ref` and `nullable` are not supported. And inline composed schemas has bug using tooling. > Per the openapi spec, properties adjacent to refs are ignored: https://github.com/OAI/OpenAPI-Specification/blob/main/versions/3.1.0.md#reference-object This...

[openapi] wrong use of $ref and nullable

1

**[description]** file: [airflow/airflow/api_connexion/openapi/v1.yaml](https://github.com/apache/airflow/blob/main/airflow/api_connexion/openapi/v1.yaml) As seen in the file above, the following usages are used in many places: ``` # line 2661 dag_run_timeout: nullable: true $ref: '#/components/schemas/TimeDelta' # line 2498 sla_miss:...