From 1a04ed835c74a71e98719dfc5ae8e103e6c1411c Mon Sep 17 00:00:00 2001
From: kennethmhc <kennethmhc@users.noreply.github.com>
Date: Tue, 23 Apr 2024 17:23:23 +0200
Subject: [PATCH] [APPEND][FSTORE-1135] Fix preview embedding in the UI when pk
 is not in the opensearch schema (#1765)

(cherry picked from commit af7a7dec5a7c084f264c03364e70416b32c815e5)
---
 .../hops/hopsworks/vectordb/OpensearchVectorDatabase.java   | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/vector-db/src/main/java/io/hops/hopsworks/vectordb/OpensearchVectorDatabase.java b/vector-db/src/main/java/io/hops/hopsworks/vectordb/OpensearchVectorDatabase.java
index 995e289797..65fed15e72 100644
--- a/vector-db/src/main/java/io/hops/hopsworks/vectordb/OpensearchVectorDatabase.java
+++ b/vector-db/src/main/java/io/hops/hopsworks/vectordb/OpensearchVectorDatabase.java
@@ -203,6 +203,12 @@ public void batchWrite(Index index, Map<String, String> data) throws VectorDatab
   public List<Map<String, Object>> preview(Index index, Set<Field> fields, int n) throws VectorDatabaseException {
     List<Map<String, Object>> results = Lists.newArrayList();
 
+    // If fields is empty, return no result, otherwise the search query matches any documents which may not
+    // belong to requested feature group.
+    if (fields.size() == 0) {
+      return results;
+    }
+
     // Create a bool query
     BoolQueryBuilder boolQueryBuilder = QueryBuilders.boolQuery();