fix #1747 (#1757)

* fix
Signed-off-by: NNicky <nicky.xj.lin@gmail.com>

* update.
Signed-off-by: NNicky <nicky.xj.lin@gmail.com>

* lint pass
Signed-off-by: Nxiaojun.lin <xiaojun.lin@zilliz.com>

* UPDATE CASE: search with tag not exist
Signed-off-by: Nzw <zw@zilliz.com>
Co-authored-by: Nzw <zw@zilliz.com>

CHANGELOG.md

@@ -19,6 +19,7 @@ Please mark all change in change log and use the issue from GitHub
 -   \#1728 Optimize request handler to combine similar query
 -   \#1734 Opentracing for combined search request
 -   \#1735 Fix search out of memory with ivf_flat 
+-   \#1747 Expected error status if search with partition_tag not existed
 -   \#1756 Fix memory exhausted during searching 
 
 ## Feature

core/src/db/DBImpl.cpp

@@ -1130,7 +1130,10 @@ DBImpl::Query(const std::shared_ptr<server::Context>& context, const std::string
     } else {
         // get files from specified partitions
         std::set<std::string> partition_name_array;
-        GetPartitionsByTags(table_id, partition_tags, partition_name_array);
+        status = GetPartitionsByTags(table_id, partition_tags, partition_name_array);
+        if (!status.ok()) {
+            return status;  // didn't match any partition.
+        }
 
         for (auto& partition_name : partition_name_array) {
             status = GetFilesToSearch(partition_name, files_array);
@@ -1665,6 +1668,10 @@ DBImpl::GetPartitionsByTags(const std::string& table_id, const std::vector<std::
         }
     }
 
+    if (partition_name_array.empty()) {
+        return Status(PARTITION_NOT_FOUND, "Cannot find the specified partitions");
+    }
+
     return Status::OK();
 }
 

core/src/utils/Error.h

@@ -93,6 +93,7 @@ constexpr ErrorCode DB_INCOMPATIB_META = ToDbErrorCode(6);
 constexpr ErrorCode DB_INVALID_META_URI = ToDbErrorCode(7);
 constexpr ErrorCode DB_EMPTY_TABLE = ToDbErrorCode(8);
 constexpr ErrorCode DB_BLOOM_FILTER_ERROR = ToDbErrorCode(9);
+constexpr ErrorCode PARTITION_NOT_FOUND = ToDbErrorCode(10);
 
 // knowhere error code
 constexpr ErrorCode KNOWHERE_ERROR = ToKnowhereErrorCode(1);

tests/milvus_python_test/test_search_vectors.py

@@ -327,8 +327,7 @@ class TestSearchBase:
         search_param = get_search_param(index_type)
         status, result = connect.search_vectors(collection, top_k, query_vec, partition_tags=["new_tag"], params=search_param)
         logging.getLogger().info(result)
-        assert status.OK()
-        assert len(result) == 0
+        assert not status.OK()
 
     def test_search_l2_index_params_partition_E(self, connect, collection, get_simple_index):
         '''