New metric type for struct vectors

Signed-off-by: yhmo <yihua.mo@zilliz.com>

Author: yhmo

docker-compose.yml

@@ -3,7 +3,7 @@ version: '3.5'
 services:
   standalone:
     container_name: milvus-javasdk-standalone-1
-    image: milvusdb/milvus:master-20250929-ca1cc7c9-amd64
+    image: milvusdb/milvus:master-20251011-faaf2159-amd64
     command: [ "milvus", "run", "standalone" ]
     environment:
       - COMMON_STORAGETYPE=local
@@ -24,7 +24,7 @@ services:
 
   standaloneslave:
     container_name: milvus-javasdk-standalone-2
-    image: milvusdb/milvus:master-20250929-ca1cc7c9-amd64
+    image: milvusdb/milvus:master-20251011-faaf2159-amd64
     command: [ "milvus", "run", "standalone" ]
     environment:
       - COMMON_STORAGETYPE=local

sdk-core/src/main/java/io/milvus/v2/common/IndexParam.java

@@ -53,8 +53,14 @@ public enum MetricType {
         // Only for sparse vector with BM25
         BM25,
 
-        // Only for struct vector
-        MAX_SIM,
+        // Only for float vector inside struct
+        MAX_SIM, // equal to MAX_SIM_COSINE
+        MAX_SIM_COSINE,
+        MAX_SIM_IP,
+        MAX_SIM_L2,
+        // Only for binary vector inside struct
+        MAX_SIM_JACCARD,
+        MAX_SIM_HAMMING,
         ;
     }
 
@@ -105,9 +111,6 @@ public enum IndexType {
         // From Milvus 2.5.4 onward, SPARSE_WAND is being deprecated. Instead, it is recommended to
         // use "inverted_index_algo": "DAAT_WAND" for equivalency while maintaining compatibility.
         SPARSE_WAND(301),
-
-        // Only for struct vector
-        EMB_LIST_HNSW(401),
         ;
 
         private final String name;

sdk-core/src/test/java/io/milvus/TestUtils.java

@@ -11,7 +11,7 @@ public class TestUtils {
     private int dimension = 256;
     private static final Random RANDOM = new Random();
 
-    public static final String MilvusDockerImageID = "milvusdb/milvus:master-20250929-ca1cc7c9-amd64";
+    public static final String MilvusDockerImageID = "milvusdb/milvus:master-20251011-faaf2159-amd64";
 
     public TestUtils(int dimension) {
         this.dimension = dimension;

sdk-core/src/test/java/io/milvus/v2/client/MilvusClientV2DockerTest.java

@@ -1028,6 +1028,7 @@ void testStruct() {
         String structField = "clips";
         String structScalarField = "desc";
         String structVectorField = "clip";
+        String structBinVectorField = "clip_bin";
         int structCapacity = 300;
         int varcharLength = 100;
         CreateCollectionReq.CollectionSchema collectionSchema = CreateCollectionReq.CollectionSchema.builder()
@@ -1065,6 +1066,12 @@ void testStruct() {
                         .dataType(DataType.FloatVector)
                         .dimension(DIMENSION)
                         .build())
+                .addStructField(AddFieldReq.builder()
+                        .fieldName(structBinVectorField)
+                        .description("dummy")
+                        .dataType(DataType.BinaryVector)
+                        .dimension(DIMENSION)
+                        .build())
                 .build());
 
         client.dropCollection(DropCollectionReq.builder()
@@ -1084,9 +1091,14 @@ void testStruct() {
                 .metricType(IndexParam.MetricType.COSINE)
                 .build());
         indexParams.add(IndexParam.builder()
-                .fieldName(structVectorField)
-                .indexType(IndexParam.IndexType.EMB_LIST_HNSW)
-                .metricType(IndexParam.MetricType.MAX_SIM)
+                .fieldName("clips[clip]")
+                .indexType(IndexParam.IndexType.HNSW)
+                .metricType(IndexParam.MetricType.MAX_SIM_L2)
+                .build());
+        indexParams.add(IndexParam.builder()
+                .fieldName("clips[clip_bin]")
+                .indexType(IndexParam.IndexType.BIN_IVF_FLAT)
+                .metricType(IndexParam.MetricType.MAX_SIM_HAMMING)
                 .build());
         client.createIndex(CreateIndexReq.builder()
                 .collectionName(randomCollectionName)
@@ -1128,8 +1140,8 @@ void testStruct() {
                 .build());
         Assertions.assertEquals(1, indexDesc.getIndexDescriptions().size());
         DescribeIndexResp.IndexDesc desc = indexDesc.getIndexDescriptions().get(0);
-        Assertions.assertEquals(IndexParam.IndexType.EMB_LIST_HNSW, desc.getIndexType());
-        Assertions.assertEquals(IndexParam.MetricType.MAX_SIM, desc.getMetricType());
+        Assertions.assertEquals(IndexParam.IndexType.HNSW, desc.getIndexType());
+        Assertions.assertEquals(IndexParam.MetricType.MAX_SIM_COSINE, desc.getMetricType());
 
         // insert
         List<JsonObject> rows = new ArrayList<>();