[Bug]: search iterator always gives empty results

[subhamhimself]

Is there an existing issue for this?

• I have searched the existing issues

Environment

- Milvus version: 2.5
- Deployment mode(standalone or cluster): cluster
- MQ type(rocksmq, pulsar or kafka):    
- SDK version(e.g. pymilvus v2.0.0rc2): pymilvus 2.4.5
- OS(Ubuntu or CentOS): 
- CPU/Memory: 
- GPU: 
- Others:

Current Behavior

We use 'IP' metric, but our vectors are normalized so we get metric always between -1 to 1.
Index is IVF_FLAT with nlist=128.
For Collection.search_iterator, even after setting {"radius": -1, "range_filter": 1}, we get following error on a million scale partition:

Cannot init search iterator because init page contains no matched rows, please check the radius and range_filter set up by searchParams

Most likely it started happening when we upgraded our milvus to 2.5, but we're not sure about that.

Expected Behavior

No response

Steps To Reproduce

param = {'metric_type': 'IP', 'params': {'nprobe': 128, 'radius': -10000000, 'range_filter': 10000000}}

Milvus Log

No response

Anything else?

Adding that client.search seems to respect these parameters perfectly fine. Only collection.search_iterators has problems

[xiaofan-luan]

The reason of this error is you can not find even one valid data between the range.

I think you will need to check the distance of your query and some vector in your collection

[subhamhimself]

@xiaofan-luan MilvusClient.search() works perfectly fine for the same parameters and I see over a million vectors.

[yanliang567]

@MrPresent-Han could you please take a look? is it something different with iterator v1 and v2?
/assign @MrPresent-Han
/unassign