Support on demand feature views in feature services

sdk/python/feast/feature_service.py

@@ -6,6 +6,7 @@
 from feast.feature_table import FeatureTable
 from feast.feature_view import FeatureView
 from feast.feature_view_projection import FeatureViewProjection
+from feast.on_demand_feature_view import OnDemandFeatureView
 from feast.protos.feast.core.FeatureService_pb2 import (
     FeatureService as FeatureServiceProto,
 )
@@ -38,7 +39,9 @@ class FeatureService:
     def __init__(
         self,
         name: str,
-        features: List[Union[FeatureTable, FeatureView, FeatureViewProjection]],
+        features: List[
+            Union[FeatureTable, FeatureView, OnDemandFeatureView, FeatureViewProjection]
+        ],
         tags: Optional[Dict[str, str]] = None,
         description: Optional[str] = None,
     ):
@@ -51,7 +54,11 @@ def __init__(
         self.name = name
         self.features = []
         for feature in features:
-            if isinstance(feature, FeatureTable) or isinstance(feature, FeatureView):
+            if (
+                isinstance(feature, FeatureTable)
+                or isinstance(feature, FeatureView)
+                or isinstance(feature, OnDemandFeatureView)
+            ):
                 self.features.append(FeatureViewProjection.from_definition(feature))
             elif isinstance(feature, FeatureViewProjection):
                 self.features.append(feature)

sdk/python/feast/on_demand_feature_view.py

@@ -9,6 +9,7 @@
 from feast.errors import RegistryInferenceFailure
 from feast.feature import Feature
 from feast.feature_view import FeatureView
+from feast.feature_view_projection import FeatureViewProjection
 from feast.protos.feast.core.OnDemandFeatureView_pb2 import (
     OnDemandFeatureView as OnDemandFeatureViewProto,
 )
@@ -132,6 +133,16 @@ def get_transformed_features_df(
         df_with_features.drop(columns=columns_to_cleanup, inplace=True)
         return df_with_transformed_features
 
+    def __getitem__(self, item) -> FeatureViewProjection:
+        assert isinstance(item, list)
+
+        referenced_features = []
+        for feature in self.features:
+            if feature.name in item:
+                referenced_features.append(feature)
+
+        return FeatureViewProjection(self.name, referenced_features)
+
     def infer_features_from_batch_source(self, config: RepoConfig):
         """
         Infers the set of features associated to this feature view from the input source.

sdk/python/tests/integration/feature_repos/universal/feature_views.py

@@ -57,7 +57,7 @@ def conv_rate_plus_100_feature_view(
     )
 
 
-def create_driver_hourly_stats_feature_view(source, infer_features: bool = True):
+def create_driver_hourly_stats_feature_view(source, infer_features: bool = False):
     driver_stats_feature_view = FeatureView(
         name="driver_stats",
         entities=["driver"],

sdk/python/tests/integration/offline_store/test_universal_historical_retrieval.py

@@ -8,6 +8,7 @@
 from pytz import utc
 
 from feast import utils
+from feast.feature_service import FeatureService
 from feast.feature_view import FeatureView
 from feast.infra.offline_stores.offline_utils import (
     DEFAULT_ENTITY_DF_EVENT_TIMESTAMP_COL,
@@ -183,9 +184,22 @@ def test_historical_features(environment, universal_data_sources, full_feature_n
         feature_views["global"],
     )
 
+    feature_service = FeatureService(
+        "convrate_plus100",
+        features=[feature_views["driver"][["conv_rate"]], feature_views["driver_odfv"]],
+    )
+
     feast_objects = []
     feast_objects.extend(
-        [customer_fv, driver_fv, driver_odfv, global_fv, driver(), customer()]
+        [
+            customer_fv,
+            driver_fv,
+            driver_odfv,
+            global_fv,
+            driver(),
+            customer(),
+            feature_service,
+        ]
     )
     store.apply(feast_objects)
 
@@ -312,6 +326,14 @@ def test_historical_features(environment, universal_data_sources, full_feature_n
     assert_frame_equal(
         expected_df, actual_df_from_df_entities, check_dtype=False,
     )
+    assert_feature_service_correctness(
+        store,
+        feature_service,
+        full_feature_names,
+        orders_df,
+        expected_df,
+        event_timestamp,
+    )
 
     # on demand features is only plumbed through to to_df for now.
     table_from_df_entities: pd.DataFrame = job_from_df.to_arrow().to_pandas()
@@ -330,3 +352,54 @@ def test_historical_features(environment, universal_data_sources, full_feature_n
         .reset_index(drop=True)
     )
     assert_frame_equal(actual_df_from_df_entities_for_table, table_from_df_entities)
+
+
+def response_feature_name(feature: str, full_feature_names: bool) -> str:
+    if feature in {"conv_rate", "avg_daily_trips"} and full_feature_names:
+        return f"driver_stats__{feature}"
+
+    if feature in {"conv_rate_plus_100"} and full_feature_names:
+        return f"conv_rate_plus_100__{feature}"
+
+    return feature
+
+
+def assert_feature_service_correctness(
+    store, feature_service, full_feature_names, orders_df, expected_df, event_timestamp
+):
+
+    job_from_df = store.get_historical_features(
+        entity_df=orders_df,
+        features=feature_service,
+        full_feature_names=full_feature_names,
+    )
+
+    actual_df_from_df_entities = job_from_df.to_df()
+
+    expected_df: pd.DataFrame = (
+        expected_df.sort_values(
+            by=[event_timestamp, "order_id", "driver_id", "customer_id"]
+        )
+        .drop_duplicates()
+        .reset_index(drop=True)
+    )
+    expected_df = expected_df[
+        [
+            event_timestamp,
+            "order_id",
+            "driver_id",
+            "customer_id",
+            response_feature_name("conv_rate", full_feature_names),
+            "conv_rate_plus_100",
+        ]
+    ]
+    actual_df_from_df_entities = (
+        actual_df_from_df_entities[expected_df.columns]
+        .sort_values(by=[event_timestamp, "order_id", "driver_id", "customer_id"])
+        .drop_duplicates()
+        .reset_index(drop=True)
+    )
+
+    assert_frame_equal(
+        expected_df, actual_df_from_df_entities, check_dtype=False,
+    )

sdk/python/tests/integration/online_store/test_universal_online.py

@@ -4,6 +4,7 @@
 import pandas as pd
 import pytest
 
+from feast import FeatureService
 from tests.integration.feature_repos.repo_configuration import (
     construct_universal_feature_views,
 )
@@ -17,9 +18,15 @@ def test_online_retrieval(environment, universal_data_sources, full_feature_name
     fs = environment.feature_store
     entities, datasets, data_sources = universal_data_sources
     feature_views = construct_universal_feature_views(data_sources)
+
+    feature_service = FeatureService(
+        "convrate_plus100",
+        features=[feature_views["driver"][["conv_rate"]], feature_views["driver_odfv"]],
+    )
+
     feast_objects = []
     feast_objects.extend(feature_views.values())
-    feast_objects.extend([driver(), customer()])
+    feast_objects.extend([driver(), customer(), feature_service])
     fs.apply(feast_objects)
     fs.materialize(environment.start_date, environment.end_date)
 
@@ -114,6 +121,16 @@ def test_online_retrieval(environment, universal_data_sources, full_feature_name
                 ][0]
             )
 
+    assert_feature_service_correctness(
+        fs,
+        feature_service,
+        entity_rows,
+        full_feature_names,
+        drivers_df,
+        customers_df,
+        global_df,
+    )
+
 
 def response_feature_name(feature: str, full_feature_names: bool) -> str:
     if (
@@ -147,3 +164,38 @@ def get_latest_feature_values_from_dataframes(
     latest_global_row = global_df.loc[global_df["event_timestamp"].idxmax()].to_dict()
 
     return {**latest_customer_row, **latest_driver_row, **latest_global_row}
+
+
+def assert_feature_service_correctness(
+    fs,
+    feature_service,
+    entity_rows,
+    full_feature_names,
+    drivers_df,
+    customers_df,
+    global_df,
+):
+    feature_service_response = fs.get_online_features(
+        features=feature_service,
+        entity_rows=entity_rows,
+        full_feature_names=full_feature_names,
+    )
+    assert feature_service_response is not None
+
+    feature_service_online_features_dict = feature_service_response.to_dict()
+    feature_service_keys = feature_service_online_features_dict.keys()
+
+    assert (
+        len(feature_service_keys) == len(feature_service.features) + 2
+    )  # Add two for the driver id and the customer id entity keys.
+
+    for i, entity_row in enumerate(entity_rows):
+        df_features = get_latest_feature_values_from_dataframes(
+            drivers_df, customers_df, global_df, entity_row
+        )
+        assert (
+            feature_service_online_features_dict[
+                response_feature_name("conv_rate_plus_100", full_feature_names)
+            ][i]
+            == df_features["conv_rate"] + 100
+        )