diff --git a/internal/core/unittest/test_growing.cpp b/internal/core/unittest/test_growing.cpp
index 8ada12e9da..148a682626 100644
--- a/internal/core/unittest/test_growing.cpp
+++ b/internal/core/unittest/test_growing.cpp
@@ -501,7 +501,7 @@ TEST_P(GrowingTest, FillVectorArrayData) {
 
 TEST(GrowingTest, LoadVectorArrayData) {
     auto schema = std::make_shared<Schema>();
-    auto metric_type = knowhere::metric::L2;
+    auto metric_type = knowhere::metric::MAX_SIM;
     auto int64_field = schema->AddDebugField("int64", DataType::INT64);
     auto array_float_vector = schema->AddDebugVectorArrayField(
         "array_vec", DataType::VECTOR_FLOAT, 128, metric_type);
diff --git a/internal/core/unittest/test_sealed.cpp b/internal/core/unittest/test_sealed.cpp
index e81f74e4ff..d2dac32d20 100644
--- a/internal/core/unittest/test_sealed.cpp
+++ b/internal/core/unittest/test_sealed.cpp
@@ -2277,7 +2277,7 @@ TEST(Sealed, SearchSortedPk) {
 
 TEST(Sealed, QueryVectorArrayAllFields) {
     auto schema = std::make_shared<Schema>();
-    auto metric_type = knowhere::metric::L2;
+    auto metric_type = knowhere::metric::MAX_SIM;
     auto int64_field = schema->AddDebugField("int64", DataType::INT64);
     auto array_vec = schema->AddDebugVectorArrayField(
         "array_vec", DataType::VECTOR_FLOAT, 128, metric_type);
diff --git a/internal/proxy/util.go b/internal/proxy/util.go
index 43db708f47..4053a6570a 100644
--- a/internal/proxy/util.go
+++ b/internal/proxy/util.go
@@ -592,6 +592,10 @@ func ValidateFieldsInStruct(field *schemapb.FieldSchema, schema *schemapb.Collec
 		return fmt.Errorf("Nested array is not supported %s", field.Name)
 	}
 
+	if field.ElementType == schemapb.DataType_JSON {
+		return fmt.Errorf("JSON is not supported for fields in struct, fieldName = %s", field.Name)
+	}
+
 	if field.DataType == schemapb.DataType_Array {
 		if typeutil.IsVectorType(field.GetElementType()) {
 			return fmt.Errorf("Inconsistent schema: element type of array field %s is a vector type", field.Name)
diff --git a/internal/proxy/util_test.go b/internal/proxy/util_test.go
index 4df7e9b7c4..3bb08a14fa 100644
--- a/internal/proxy/util_test.go
+++ b/internal/proxy/util_test.go
@@ -3901,6 +3901,17 @@ func TestValidateFieldsInStruct(t *testing.T) {
 		assert.Contains(t, err.Error(), "Fields in StructArrayField can only be array or array of struct")
 	})
 
+	t.Run("JSON not supported in struct", func(t *testing.T) {
+		field := &schemapb.FieldSchema{
+			Name:        "json_field",
+			DataType:    schemapb.DataType_Array,
+			ElementType: schemapb.DataType_JSON,
+		}
+		err := ValidateFieldsInStruct(field, schema)
+		assert.Error(t, err)
+		assert.Contains(t, err.Error(), "JSON is not supported for fields in struct")
+	})
+
 	t.Run("nested array not supported", func(t *testing.T) {
 		testCases := []struct {
 			elementType schemapb.DataType