From c85f4c5695fd09c00febcc9995ea229891ee66d5 Mon Sep 17 00:00:00 2001
From: Aditi Ahuja <48997495+metonymic-smokey@users.noreply.github.com>
Date: Thu, 28 Nov 2024 15:38:31 +0530
Subject: [PATCH] MB-64360 - Guardrail fix for missing vectors (#282)

In case a doc has invalid vector fields but valid non-vector fields,
filter hit IDs may be ineligible for the kNN since the document does not
have any/valid vectors. This PR adds a check to avoid kNN in such cases.
---
 faiss_vector_posting.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/faiss_vector_posting.go b/faiss_vector_posting.go
index 6b9840f..9c53c07 100644
--- a/faiss_vector_posting.go
+++ b/faiss_vector_posting.go
@@ -403,6 +403,10 @@ func (sb *SegmentBase) InterpretVectorIndex(field string, requiresFiltering bool
 						vectorIDsToInclude = append(vectorIDsToInclude, docVecIDMap[uint32(id)]...)
 					}
 
+					if len(vectorIDsToInclude) == 0 {
+						return rv, nil
+					}
+
 					// Retrieve the mapping of centroid IDs to vectors within
 					// the cluster.
 					clusterAssignment, _ := vecIndex.ObtainClusterToVecIDsFromIVFIndex()