fix(core): default MetadataFilters condition to AND when None

llama-index-core/llama_index/core/vector_stores/utils.py

@@ -1,5 +1,5 @@
 import json
-from typing import Any, Dict, Optional, Tuple, Callable, Mapping, cast
+from typing import Any, Dict, Optional, Tuple, Callable, Mapping
 
 from llama_index.core.schema import (
     BaseNode,
@@ -107,7 +107,7 @@ def build_metadata_filter_fn(
     if not filter_list or not metadata_filters:
         return lambda _: True
 
-    filter_condition = cast(MetadataFilters, metadata_filters.condition)
+    filter_condition = metadata_filters.condition or FilterCondition.AND
 
     def filter_fn(node_id: str) -> bool:
         def _process_filter_match(

llama-index-core/tests/vector_stores/test_metadata_filters_logic.py

@@ -52,6 +52,21 @@ def test_and_condition_matches_expected_nodes() -> None:
     assert fn("n3")
 
 
+def test_none_condition_defaults_to_and() -> None:
+    filters = MetadataFilters(
+        filters=[
+            MetadataFilter(key="rank", operator=FilterOperator.NE, value="a"),
+            MetadataFilter(key="weight", operator=FilterOperator.GTE, value=2.0),
+        ],
+        condition=None,
+    )
+    fn = build_metadata_filter_fn(_METADATA_BY_ID.__getitem__, filters)
+
+    assert not fn("n1")
+    assert fn("n2")
+    assert fn("n3")
+
+
 def test_or_condition_matches_expected_nodes() -> None:
     filters = MetadataFilters(
         filters=[