fix: Validate entities when running get_online_features (feast-dev#5031)

Author: franciscojavierarceo

sdk/python/feast/utils.py

@@ -687,25 +687,48 @@ def _get_unique_entities(
         entity_name_to_join_key_map,
         join_key_values,
     )
+    # Validate that all expected join keys exist and have non-empty values.
+    expected_keys = set(entity_name_to_join_key_map.values())
+    expected_keys.discard("__dummy_id")
+    missing_keys = sorted(
+        list(set([key for key in expected_keys if key not in table_entity_values]))
+    )
+    empty_keys = sorted(
+        list(set([key for key in expected_keys if not table_entity_values.get(key)]))
+    )
 
-    # Convert back to rowise.
-    keys = table_entity_values.keys()
-    # Sort the rowise data to allow for grouping but keep original index. This lambda is
-    # sufficient as Entity types cannot be complex (ie. lists).
+    if missing_keys or empty_keys:
+        if not any(table_entity_values.values()):
+            raise KeyError(
+                f"Missing join key values for keys: {missing_keys}. "
+                f"No values provided for keys: {empty_keys}. "
+                f"Provided join_key_values: {list(join_key_values.keys())}"
+            )
+
+    # Convert the column-oriented table_entity_values into row-wise data.
+    keys = list(table_entity_values.keys())
+    # Each row is a tuple of ValueProto objects corresponding to the join keys.
     rowise = list(enumerate(zip(*table_entity_values.values())))
+
+    # If there are no rows, return empty tuples.
+    if not rowise:
+        return (), ()
+
+    # Sort rowise so that rows with the same join key values are adjacent.
     rowise.sort(key=lambda row: tuple(getattr(x, x.WhichOneof("val")) for x in row[1]))
 
-    # Identify unique entities and the indexes at which they occur.
-    unique_entities: Tuple[Dict[str, ValueProto], ...]
-    indexes: Tuple[List[int], ...]
-    unique_entities, indexes = tuple(
-        zip(
-            *[
-                (dict(zip(keys, k)), [_[0] for _ in g])
-                for k, g in itertools.groupby(rowise, key=lambda x: x[1])
-            ]
-        )
-    )
+    # Group rows by their composite join key value.
+    groups = [
+        (dict(zip(keys, key_tuple)), [idx for idx, _ in group])
+        for key_tuple, group in itertools.groupby(rowise, key=lambda row: row[1])
+    ]
+
+    # If no groups were formed (should not happen for valid input), return empty tuples.
+    if not groups:
+        return (), ()
+
+    # Unpack the unique entities and their original row indexes.
+    unique_entities, indexes = tuple(zip(*groups))
     return unique_entities, indexes
 
 

sdk/python/tests/unit/online_store/test_online_retrieval.py

@@ -137,6 +137,21 @@ def test_get_online_features() -> None:
 
         assert "trips" in result
 
+        with pytest.raises(KeyError) as excinfo:
+            _ = store.get_online_features(
+                features=["driver_locations:lon"],
+                entity_rows=[{"customer_id": 0}],
+                full_feature_names=False,
+            ).to_dict()
+
+        error_message = str(excinfo.value)
+        assert "Missing join key values for keys:" in error_message
+        assert (
+            "Missing join key values for keys: ['customer_id', 'driver_id', 'item_id']."
+            in error_message
+        )
+        assert "Provided join_key_values: ['customer_id']" in error_message
+
         result = store.get_online_features(
             features=["customer_profile_pandas_odfv:on_demand_age"],
             entity_rows=[{"driver_id": 1, "customer_id": "5"}],

sdk/python/tests/unit/test_unit_feature_store.py

@@ -1,6 +1,8 @@
 from dataclasses import dataclass
 from typing import Dict, List
 
+import pytest
+
 from feast import utils
 from feast.protos.feast.types.Value_pb2 import Value
 
@@ -17,7 +19,7 @@ class MockFeatureView:
     projection: MockFeatureViewProjection
 
 
-def test_get_unique_entities():
+def test_get_unique_entities_success():
     entity_values = {
         "entity_1": [Value(int64_val=1), Value(int64_val=2), Value(int64_val=1)],
         "entity_2": [
@@ -41,9 +43,87 @@ def test_get_unique_entities():
         join_key_values=entity_values,
         entity_name_to_join_key_map=entity_name_to_join_key_map,
     )
-
-    assert unique_entities == (
+    expected_entities = (
         {"entity_1": Value(int64_val=1), "entity_2": Value(string_val="1")},
         {"entity_1": Value(int64_val=2), "entity_2": Value(string_val="2")},
     )
-    assert indexes == ([0, 2], [1])
+    expected_indexes = ([0, 2], [1])
+
+    assert unique_entities == expected_entities
+    assert indexes == expected_indexes
+
+
+def test_get_unique_entities_missing_join_key_success():
+    """
+    Tests that _get_unique_entities raises a KeyError when a required join key is missing.
+    """
+    # Here, we omit the required key for "entity_1"
+    entity_values = {
+        "entity_2": [
+            Value(string_val="1"),
+            Value(string_val="2"),
+            Value(string_val="1"),
+        ],
+    }
+
+    entity_name_to_join_key_map = {"entity_1": "entity_1", "entity_2": "entity_2"}
+
+    fv = MockFeatureView(
+        name="fv_1",
+        entities=["entity_1", "entity_2"],
+        projection=MockFeatureViewProjection(join_key_map={}),
+    )
+
+    unique_entities, indexes = utils._get_unique_entities(
+        table=fv,
+        join_key_values=entity_values,
+        entity_name_to_join_key_map=entity_name_to_join_key_map,
+    )
+    expected_entities = (
+        {"entity_2": Value(string_val="1")},
+        {"entity_2": Value(string_val="2")},
+    )
+    expected_indexes = ([0, 2], [1])
+
+    assert unique_entities == expected_entities
+    assert indexes == expected_indexes
+    # We're not say anything about the entity_1 missing from the unique_entities list
+    assert "entity_1" not in [entity.keys() for entity in unique_entities]
+
+
+def test_get_unique_entities_missing_all_join_keys_error():
+    """
+    Tests that _get_unique_entities raises a KeyError when all required join keys are missing.
+    """
+    entity_values_not_in_feature_view = {
+        "entity_3": [Value(string_val="3")],
+    }
+    entity_name_to_join_key_map = {
+        "entity_1": "entity_1",
+        "entity_2": "entity_2",
+        "entity_3": "entity_3",
+    }
+
+    fv = MockFeatureView(
+        name="fv_1",
+        entities=["entity_1", "entity_2"],
+        projection=MockFeatureViewProjection(join_key_map={}),
+    )
+
+    with pytest.raises(KeyError) as excinfo:
+        utils._get_unique_entities(
+            table=fv,
+            join_key_values=entity_values_not_in_feature_view,
+            entity_name_to_join_key_map=entity_name_to_join_key_map,
+        )
+
+    error_message = str(excinfo.value)
+    assert (
+        "Missing join key values for keys: ['entity_1', 'entity_2', 'entity_3']"
+        in error_message
+    )
+    assert (
+        "No values provided for keys: ['entity_1', 'entity_2', 'entity_3']"
+        in error_message
+    )
+    assert "Provided join_key_values: ['entity_3']" in error_message