I want to query all data that only satisfy the vector query, without setting the number of query results myself. May I ask how to operate it?

[alei-jia]

maven
<dependency> <groupId>org.springframework.ai</groupId> <artifactId>spring-ai-milvus-store</artifactId> </dependency>

[yhmo]

SearchIterator is for this purpose.
The example: https://github.com/milvus-io/milvus-sdk-java/blob/0a2b60da914032fb88852b01ade7f97fa28ed46f/examples/src/main/java/io/milvus/v2/IteratorExample.java#L166

Note: searchIteratorV1 is supported by milvus server version v2.3/v2.4/v2.5, searchIteratorV2 is only supported by milvus server version v2.5. If your milvus server is v2.5, searchIteratorV2 is recommended.

In the example, we set "topk" value for searchIterator. If you don't specify the topk value, you will get all results that meet your filtering expression.
For searchIteratorV1:

        SearchIterator searchIterator = client.searchIterator(SearchIteratorReq.builder()
                .collectionName(COLLECTION_NAME)
                .outputFields(Lists.newArrayList(AGE_FIELD))
                .batchSize(batchSize)
                .vectorFieldName(VECTOR_FIELD)
                .vectors(Collections.singletonList(new FloatVec(CommonUtils.generateFloatVector(VECTOR_DIM))))
                .expr(expr)
                .params(StringUtils.isEmpty(params) ? "{}" : params)
//                .topK(topK)
                .metricType(IndexParam.MetricType.L2)
                .consistencyLevel(ConsistencyLevel.BOUNDED)
                .build());

        while (true) {
            List<QueryResultsWrapper.RowRecord> res = searchIterator.next();
            if (res.isEmpty()) {
                System.out.println("Search iteration finished, close");
                searchIterator.close();
                break;
            }

            for (QueryResultsWrapper.RowRecord record : res) {
                System.out.println(record);
            }
        }

For searchIteratorV2:

        SearchIteratorV2 searchIterator = client.searchIteratorV2(SearchIteratorReqV2.builder()
                .collectionName(COLLECTION_NAME)
                .outputFields(Lists.newArrayList(AGE_FIELD))
                .batchSize(batchSize)
                .vectorFieldName(VECTOR_FIELD)
                .vectors(Collections.singletonList(new FloatVec(CommonUtils.generateFloatVector(VECTOR_DIM))))
                .filter(filter)
                .searchParams(params==null ? new HashMap<>() : params)
//                .topK(topK)
                .metricType(IndexParam.MetricType.L2)
                .consistencyLevel(ConsistencyLevel.BOUNDED)
                .externalFilterFunc(externalFilterFunc)
                .build());

        while (true) {
            List<SearchResp.SearchResult> res = searchIterator.next();
            if (res.isEmpty()) {
                System.out.println("Search iteration finished, close");
                searchIterator.close();
                break;
            }

            for (SearchResp.SearchResult record : res) {
                System.out.println(record);
            }
        }