[Bug]: [null & default] Failed to create collection for the second time with the same schema when set "default_value" property for one field

[binbinlv]

Is there an existing issue for this?

• I have searched the existing issues

Environment

- Milvus version: master-20240920-6e430bd4
- Deployment mode(standalone or cluster):both
- MQ type(rocksmq, pulsar or kafka):    all
- SDK version(e.g. pymilvus v2.0.0rc2): 2.5.0rc80
- OS(Ubuntu or CentOS): 
- CPU/Memory: 
- GPU: 
- Others:

Current Behavior

Failed to create collection for the second time with the same schema when set "default_value" property for one field

results:

pymilvus.exceptions.SchemaNotReadyException: <SchemaNotReadyException: (code=1, message=The collection already exist, but the schema is not the same as the schema passed in.)>

Expected Behavior

the collection is returned successfully for the existing collection with the same schema

Steps To Reproduce

Run the following script for twice

from pymilvus import CollectionSchema, FieldSchema
from pymilvus import Collection
from pymilvus import connections
from pymilvus import DataType
from pymilvus import Partition
from pymilvus import utility
import json
import random
import numpy as np

connections.connect()

dim = 768
int64_field = FieldSchema(name="int64", dtype=DataType.INT64, is_primary=True)
double_field = FieldSchema(name="nullableFid", dtype=DataType.VARCHAR, max_length=100)
int32_field = FieldSchema(name="int32", dtype=DataType.FLOAT, default_value=np.float32(10.0))
float_vector = FieldSchema(name="float_vector", dtype=DataType.FLOAT_VECTOR, dim=dim)
schema = CollectionSchema(fields=[int64_field, double_field, int32_field, float_vector])
collection = Collection("test", schema=schema)

Milvus Log

No response

Anything else?

No response

[binbinlv]

it breaks the atomicity for create collection operation, so set it as urgent.

[binbinlv]

The field with "nullalbe=True" is OK for this scenario.

[smellthemoon]

pr merged, could you please check it? @binbinlv

[smellthemoon]

/assign @binbinlv

[binbinlv]

Verified and fixed:

pymilvus:2.5.0rc88
milvus: master-20241011-3fe0f829-amd64

results:

>>> from pymilvus import Collection
>>> from pymilvus import connections
>>> from pymilvus import DataType
>>> from pymilvus import Partition
>>> from pymilvus import utility
from pymilvus import CollectionSchema, FieldSchema
>>> import json
from pymilvus import CollectionSchema, FieldSchema
>>> import random
>>> import numpy as np
>>>
>>>
>>> connections.connect()
>>> dim = 768
>>> int64_field = FieldSchema(name="int64", dtype=DataType.INT64, is_primary=True)
>>> double_field = FieldSchema(name="nullableFid", dtype=DataType.VARCHAR, max_length=100)
>>> int32_field = FieldSchema(name="int32", dtype=DataType.FLOAT, default_value=np.float32(10.0))
>>> float_vector = FieldSchema(name="float_vector", dtype=DataType.FLOAT_VECTOR, dim=dim)
>>> schema = CollectionSchema(fields=[int64_field, double_field, int32_field, float_vector])
>>>
>>> collection = Collection("test", schema=schema)
from pymilvus import CollectionSchema, FieldSchema
>>>
>>> collection = Collection("test", schema=schema)
>>>
>>>
>>> collection = Collection("test", schema=schema)
>>>
>>>
>>> collection = Collection("test", schema=schema)
>>>