Add support for mariadb-vector as backing vector DB (#21931)

backend/open_webui/retrieval/vector/factory.py

@@ -57,6 +57,10 @@ class Vector:
                 from open_webui.retrieval.vector.dbs.opengauss import OpenGaussClient
 
                 return OpenGaussClient()
+            case VectorType.MARIADB_VECTOR:
+                from open_webui.retrieval.vector.dbs.mariadb_vector import MariaDBVectorClient
+
+                return MariaDBVectorClient()
             case VectorType.ELASTICSEARCH:
                 from open_webui.retrieval.vector.dbs.elasticsearch import (
                     ElasticsearchClient,