fix: Fix on demand feature view crash from inference when it uses df.apply

sdk/python/feast/on_demand_feature_view.py

@@ -1,8 +1,9 @@
 import copy
 import functools
 import warnings
+from datetime import datetime
 from types import MethodType
-from typing import Dict, List, Optional, Type, Union
+from typing import Any, Dict, List, Optional, Type, Union
 
 import dill
 import pandas as pd
@@ -442,18 +443,31 @@ def infer_features(self):
         Raises:
             RegistryInferenceFailure: The set of features could not be inferred.
         """
+        # Note: Pandas will cast string or mixed number / string values to object. Assume this is string.
+        rand_df_value: Dict[str, Any] = {
+            "object": "hello world",
+            "float": 1.0,
+            "int": 1,
+            "str": "hello world",
+            "bytes": str.encode("hello world"),
+            "bool": True,
+            "datetime64[ns]": datetime.utcnow(),
+        }
+
         df = pd.DataFrame()
         for feature_view_projection in self.source_feature_view_projections.values():
             for feature in feature_view_projection.features:
                 dtype = feast_value_type_to_pandas_type(feature.dtype.to_value_type())
                 df[f"{feature_view_projection.name}__{feature.name}"] = pd.Series(
                     dtype=dtype
                 )
-                df[f"{feature.name}"] = pd.Series(dtype=dtype)
+                df[f"{feature.name}"] = pd.Series(
+                    data=rand_df_value[dtype], dtype=dtype
+                )
         for request_data in self.source_request_sources.values():
             for field in request_data.schema:
                 dtype = feast_value_type_to_pandas_type(field.dtype.to_value_type())
-                df[f"{field.name}"] = pd.Series(dtype=dtype)
+                df[f"{field.name}"] = pd.Series(rand_df_value[dtype], dtype=dtype)
         output_df: pd.DataFrame = self.udf.__call__(df)
         inferred_features = []
         for f, dt in zip(output_df.columns, output_df.dtypes):

sdk/python/tests/example_repos/on_demand_feature_view_repo.py

@@ -0,0 +1,48 @@
+from datetime import timedelta
+
+import pandas as pd
+
+from feast import FeatureView, Field, FileSource
+from feast.on_demand_feature_view import on_demand_feature_view
+from feast.types import Float32, String
+
+driver_stats = FileSource(
+    name="driver_stats_source",
+    path="data/driver_stats_lat_lon.parquet",
+    timestamp_field="event_timestamp",
+    created_timestamp_column="created",
+    description="A table describing the stats of a driver based on hourly logs",
+    owner="test2@gmail.com",
+)
+
+driver_daily_features_view = FeatureView(
+    name="driver_daily_features",
+    entities=["driver"],
+    ttl=timedelta(seconds=8640000000),
+    schema=[
+        Field(name="daily_miles_driven", dtype=Float32),
+        Field(name="lat", dtype=Float32),
+        Field(name="lon", dtype=Float32),
+        Field(name="string_feature", dtype=String),
+    ],
+    online=True,
+    source=driver_stats,
+    tags={"production": "True"},
+    owner="test2@gmail.com",
+)
+
+
+@on_demand_feature_view(
+    sources=[driver_daily_features_view],
+    schema=[
+        Field(name="first_char", dtype=String),
+        Field(name="concat_string", dtype=String),
+    ],
+)
+def location_features_from_push(inputs: pd.DataFrame) -> pd.DataFrame:
+    df = pd.DataFrame()
+    df["concat_string"] = inputs.apply(
+        lambda x: x.string_feature + "hello", axis=1
+    ).astype("string")
+    df["first_char"] = inputs["string_feature"].str[:1].astype("string")
+    return df

sdk/python/tests/integration/registration/test_cli.py

@@ -201,6 +201,37 @@ def test_nullable_online_store(test_nullable_online_store) -> None:
             runner.run(["teardown"], cwd=repo_path)
 
 
+@pytest.mark.integration
+@pytest.mark.universal_offline_stores
+def test_odfv_apply(environment) -> None:
+    project = f"test_odfv_apply{str(uuid.uuid4()).replace('-', '')[:8]}"
+    runner = CliRunner()
+
+    with tempfile.TemporaryDirectory() as repo_dir_name:
+        try:
+            repo_path = Path(repo_dir_name)
+            feature_store_yaml = make_feature_store_yaml(
+                project, environment.test_repo_config, repo_path
+            )
+
+            repo_config = repo_path / "feature_store.yaml"
+
+            repo_config.write_text(dedent(feature_store_yaml))
+
+            repo_example = repo_path / "example.py"
+            repo_example.write_text(get_example_repo("on_demand_feature_view_repo.py"))
+            result = runner.run(["apply"], cwd=repo_path)
+            assertpy.assert_that(result.returncode).is_equal_to(0)
+
+            # entity & feature view list commands should succeed
+            result = runner.run(["entities", "list"], cwd=repo_path)
+            assertpy.assert_that(result.returncode).is_equal_to(0)
+            result = runner.run(["on-demand-feature-views", "list"], cwd=repo_path)
+            assertpy.assert_that(result.returncode).is_equal_to(0)
+        finally:
+            runner.run(["teardown"], cwd=repo_path)
+
+
 @contextmanager
 def setup_third_party_provider_repo(provider_name: str):
     with tempfile.TemporaryDirectory() as repo_dir_name:

sdk/python/tests/integration/registration/test_registry.py

@@ -234,6 +234,80 @@ def test_apply_feature_view_success(test_registry):
         test_registry._get_registry_proto()
 
 
+@pytest.mark.parametrize(
+    "test_registry", [lazy_fixture("local_registry")],
+)
+def test_apply_on_demand_feature_view_success(test_registry):
+    # Create Feature Views
+    driver_stats = FileSource(
+        name="driver_stats_source",
+        path="data/driver_stats_lat_lon.parquet",
+        timestamp_field="event_timestamp",
+        created_timestamp_column="created",
+        description="A table describing the stats of a driver based on hourly logs",
+        owner="test2@gmail.com",
+    )
+
+    driver_daily_features_view = FeatureView(
+        name="driver_daily_features",
+        entities=["driver"],
+        ttl=timedelta(seconds=8640000000),
+        schema=[
+            Field(name="daily_miles_driven", dtype=Float32),
+            Field(name="lat", dtype=Float32),
+            Field(name="lon", dtype=Float32),
+            Field(name="string_feature", dtype=String),
+        ],
+        online=True,
+        source=driver_stats,
+        tags={"production": "True"},
+        owner="test2@gmail.com",
+    )
+
+    @on_demand_feature_view(
+        sources=[driver_daily_features_view],
+        schema=[Field(name="first_char", dtype=String)],
+    )
+    def location_features_from_push(inputs: pd.DataFrame) -> pd.DataFrame:
+        df = pd.DataFrame()
+        df["first_char"] = inputs["string_feature"].str[:1].astype("string")
+        return df
+
+    project = "project"
+
+    # Register Feature View
+    test_registry.apply_feature_view(location_features_from_push, project)
+
+    feature_views = test_registry.list_on_demand_feature_views(project)
+
+    # List Feature Views
+    assert (
+        len(feature_views) == 1
+        and feature_views[0].name == "location_features_from_push"
+        and feature_views[0].features[0].name == "first_char"
+        and feature_views[0].features[0].dtype == String
+    )
+
+    feature_view = test_registry.get_on_demand_feature_view(
+        "location_features_from_push", project
+    )
+    assert (
+        feature_view.name == "location_features_from_push"
+        and feature_view.features[0].name == "first_char"
+        and feature_view.features[0].dtype == String
+    )
+
+    test_registry.delete_feature_view("location_features_from_push", project)
+    feature_views = test_registry.list_on_demand_feature_views(project)
+    assert len(feature_views) == 0
+
+    test_registry.teardown()
+
+    # Will try to reload registry, which will fail because the file has been deleted
+    with pytest.raises(FileNotFoundError):
+        test_registry._get_registry_proto()
+
+
 @pytest.mark.parametrize(
     "test_registry", [lazy_fixture("local_registry")],
 )