community[patch]: Ignore null and invalid embedding values for neo4j metadata filtering (#20558)

libs/community/langchain_community/vectorstores/neo4j_vector.py

@@ -956,8 +956,17 @@ class Neo4jVector(VectorStore):
                     "Metadata filtering can't be use in combination with "
                     "a hybrid search approach"
                 )
-            parallel_query = "CYPHER runtime = parallel " if self._is_enterprise else ""
-            base_index_query = parallel_query + f"MATCH (n:`{self.node_label}`) WHERE "
+            parallel_query = (
+                "CYPHER runtime = parallel parallelRuntimeSupport=all "
+                if self._is_enterprise
+                else ""
+            )
+            base_index_query = parallel_query + (
+                f"MATCH (n:`{self.node_label}`) WHERE "
+                f"n.`{self.embedding_node_property}` IS NOT NULL AND "
+                f"size(n.`{self.embedding_node_property}`) = "
+                f"toInteger({self.embedding_dimension}) AND "
+            )
             base_cosine_query = (
                 " WITH n as node, vector.similarity.cosine("
                 f"n.`{self.embedding_node_property}`, "