[Bug]: [null & default] Restful setting json default to none when nullable is false should prompt an error

[qixuan0212]

Is there an existing issue for this?

• I have searched the existing issues

Environment

- Milvus version: master-20241119-484c6b5c-amd64
- Deployment mode(standalone or cluster): both
- MQ type(rocksmq, pulsar or kafka): pulsar   
- SDK version(e.g. pymilvus v2.0.0rc2): restful
- OS(Ubuntu or CentOS): 
- CPU/Memory: 
- GPU: 
- Others:

Current Behavior

If nullable is false and default is set to none, no error message is displayed

Expected Behavior

Restful setting default to none when nullable is false should prompt an error.
Report errors like pymilvus：
json_field = FieldSchema(name="json", dtype=DataType.JSON, nullable=False, default_value=None) File "/Users/zilliz/Library/Python/3.9/lib/python/site-packages/pymilvus/orm/schema.py", line 408, in __init__ raise ParamError(message=ExceptionsMessage.DefaultValueInvalid) pymilvus.exceptions.ParamError: <ParamError: (code=1, message=Default value cannot be None for a field that is defined as nullable == false.)>

Steps To Reproduce

    def test_create_collections_with_json_field_default(self):
        """
        json field not support default value
        """
        name = gen_collection_name()
        dim = 128
        client = self.collection_client
        payload = {
            "collectionName": name,
            "schema": {
                "fields": [
                    {"fieldName": "book_id", "dataType": "Int64", "isPrimary": True, "elementTypeParams": {}},
                    {"fieldName": "word_count", "dataType": "Int64", "elementTypeParams": {}},
                    {"fieldName": "book_describe", "dataType": "VarChar", "elementTypeParams": {"max_length": "256"}},
                    {"fieldName": "json", "dataType": "JSON", "elementTypeParams": {}, "nullable": False, "defaultValue": None},
                    {"fieldName": "book_intro", "dataType": "FloatVector", "elementTypeParams": {"dim": f"{dim}"}}
                ]
            }
        }
        logging.info(f"create collection {name} with payload: {payload}")
        rsp = client.collection_create(payload)
        assert rsp['code'] == 1100

Milvus Log

https://grafana-4am.zilliz.cc/explore?orgId=1&panes=%7B%22wIT%22:%7B%22datasource%22:%22vhI6Vw67k%22,%22queries%22:%5B%7B%22refId%22:%22A%22,%22expr%22:%22%7Bcluster%3D%5C%224am%5C%22,namespace%3D%5C%22qa-milvus%5C%22,pod%3D~%5C%22default-none-qx-ykmim.%2A%5C%22%7D%22,%22datasource%22:%7B%22type%22:%22loki%22,%22uid%22:%22vhI6Vw67k%22%7D%7D%5D,%22range%22:%7B%22from%22:%221732245080146%22,%22to%22:%221732245103306%22%7D%7D%7D&schemaVersion=1

Anything else?

N/A

[smellthemoon]

It is difficult to distinguish between set None and not set here, so no error is reported when the default value is set to none alone. However, if you want to insert none when nullable==false and want the default value to take effect, an error will still be reported. It means that set defaultValue = None is take no effect in restful, which will note in doc.

[smellthemoon]

/assign @qixuan0212