Can Support 2.3.x Range Search?

[regain0001]

Through the latest documentation of 2.3.x, I found that milvus itself supports range search, but when I tried to use cpp sdk for range query, I found that it did not work.
My query code is as follows:
// index use HNSW
// metric type is IP
milvus::SearchArguments arguments{};
arguments.SetCollectionName(collection_name);

vectorq_vector {0.1, 0.8, 0.1, 0.1};

arguments.SetGuaranteeTimestamp(milvus::GuaranteeStrongTs());
arguments.AddTargetVector(faceField, std::move(q_vector));
arguments.SetMetricType(milvus::MetricType::IP);
arguments.AddExtraParam("radius", 0.2);
arguments.AddExtraParam("range_filter", 10.0);
arguments.AddExtraParam("ef", 10);
arguments.AddOutputField(trackIdField);
int64_t topk = arguments.TopK();
cout << "topk:" << topk << endl;

milvus::SearchResults search_results{};
status = client->Search(arguments, search_results);

I has two entities both distance within target vector is between 0.2 and 10.0,but the search result is always one,
topk output is 1,So I doubt if the default topk parameter will affect the results (according to the documentation for range queries, the topk parameter is not required for range queries)。

[matrixji]

How about for having a workaround by set top to a large number, e.g arguments.SetTopK(...) before do search.
Sorry for long time not maintain this project, this sdk may even not tested with the latest milvus's version(2.3)

[regain0001]

if set topk set to a larger number, 10, then the result count is always 10,and some of the distances do not meet the requirements of range search. It seems that only topk plays a role.

[matrixji]

@regain0001 you could try latest master code, it should be fixed by #248

[regain0001]

thanks