Fix "Cannot read properties of undefined reading nq" because of the d…

…atabase is not passed to `describeCollection` function

milvus/grpc/Data.ts

@@ -67,6 +67,7 @@ import {
   f32ArrayToBinaryBytes,
   getValidDataArray,
   NO_LIMIT,
+  DescribeCollectionReq,
 } from '../';
 import { Collection } from './Collection';
 
@@ -465,11 +466,19 @@ export class Data extends Collection {
   async search(
     data: SearchReq | SearchSimpleReq | HybridSearchReq
   ): Promise<SearchResults> {
-    // get collection info
-    const collectionInfo = await this.describeCollection({
+    // default collection request
+    const describeCollectionRequest = {
       collection_name: data.collection_name,
       cache: true,
-    });
+    } as DescribeCollectionReq;
+
+    // get collection info
+    if (data.db_name) {
+      // if the request has `db_name` pass it to the request.
+      describeCollectionRequest.db_name = data.db_name;
+    }
+
+    const collectionInfo = await this.describeCollection(describeCollectionRequest);
 
     // build search params
     const { request, nq, round_decimal, isHybridSearch } = buildSearchRequest(