Include variable scope clause in deprecated Cypher query

.gitignore

@@ -5,3 +5,4 @@ __pycache__
 .mypy_cache_test
 .env
 .venv*
+.idea

libs/neo4j/langchain_neo4j/vectorstores/neo4j_vector.py

@@ -93,7 +93,7 @@ def _get_search_index_query(
                 "YIELD node, score "
             ),
             SearchType.HYBRID: (
-                "CALL { "
+                "CALL () { "
                 "CALL db.index.vector.queryNodes($index, $k, $embedding) "
                 "YIELD node, score "
                 "WITH collect({node:node, score:score}) AS nodes, max(score) AS max "

libs/neo4j/tests/integration_tests/vectorstores/test_neo4jvector.py

@@ -35,7 +35,7 @@
 texts = ["foo", "bar", "baz", "It is the end of the world. Take shelter!"]
 
 """
-cd tests/integration_tests/vectorstores/docker-compose
+cd tests/integration_tests/docker-compose
 docker-compose -f neo4j.yml up
 """
 

libs/neo4j/tests/unit_tests/vectorstores/test_neo4j.py

@@ -5,6 +5,8 @@
     remove_lucene_chars,
 )
 
+from langchain_neo4j.vectorstores.neo4j_vector import _get_search_index_query, SearchType, IndexType
+
 
 def test_escaping_lucene() -> None:
     """Test escaping lucene characters"""
@@ -65,3 +67,26 @@ def test_converting_to_yaml() -> None:
     )
 
     assert yaml_str == expected_output
+
+
+def test_get_search_index_query_hybrid_node():
+    """Test that the hybrid search query is constructed correctly with node index type."""
+    expected_query = (
+        "CALL () { "
+        "CALL db.index.vector.queryNodes($index, $k, $embedding) "
+        "YIELD node, score "
+        "WITH collect({node:node, score:score}) AS nodes, max(score) AS max "
+        "UNWIND nodes AS n "
+        "RETURN n.node AS node, (n.score / max) AS score UNION "
+        "CALL db.index.fulltext.queryNodes($keyword_index, $query, "
+        "{limit: $k}) YIELD node, score "
+        "WITH collect({node:node, score:score}) AS nodes, max(score) AS max "
+        "UNWIND nodes AS n "
+        "RETURN n.node AS node, (n.score / max) AS score "
+        "} "
+        "WITH node, max(score) AS score ORDER BY score DESC LIMIT $k "
+    )
+
+    actual_query = _get_search_index_query(SearchType.HYBRID, IndexType.NODE)
+
+    assert actual_query == expected_query