@@ -310,7 +310,7 @@ format-python:
 	cd ${ROOT_DIR}/sdk/python; python -m black --target-version py38 feast tests
 
 lint-python:
-	cd ${ROOT_DIR}/sdk/python; python -m mypy --exclude=/tests/ --follow-imports=skip feast
+	cd ${ROOT_DIR}/sdk/python; python -m mypy feast
 	cd ${ROOT_DIR}/sdk/python; python -m isort feast/ tests/ --check-only
 	cd ${ROOT_DIR}/sdk/python; python -m flake8 feast/ tests/
 	cd ${ROOT_DIR}/sdk/python; python -m black --check feast tests
 
@@ -1,6 +1,6 @@
 from abc import ABC, abstractmethod
 from types import MethodType
-from typing import TYPE_CHECKING, Optional
+from typing import TYPE_CHECKING, Any, Optional
 
 from pyspark.sql import DataFrame
 from typing_extensions import TypeAlias
@@ -51,7 +51,9 @@ def __init__(
         self.data_source = data_source
 
     @abstractmethod
-    def ingest_stream_feature_view(self, to: PushMode = PushMode.ONLINE) -> None:
+    def ingest_stream_feature_view(
+        self, to: PushMode = PushMode.ONLINE
+    ) -> Optional[Any]:
         """
         Ingests data from the stream source attached to the stream feature view; transforms the data
         and then persists it to the online store and/or offline store, depending on the 'to' parameter.
@@ -75,7 +77,7 @@ def _construct_transformation_plan(self, table: StreamTable) -> StreamTable:
         raise NotImplementedError
 
     @abstractmethod
-    def _write_stream_data(self, table: StreamTable, to: PushMode) -> None:
+    def _write_stream_data(self, table: StreamTable, to: PushMode) -> Optional[Any]:
         """
         Launches a job to persist stream data to the online store and/or offline store, depending
         on the 'to' parameter, and returns a handle for the job.
 
@@ -1,5 +1,5 @@
 import logging
-from typing import Dict, Optional
+from typing import Dict, Literal, Optional
 
 import pandas as pd
 import pytest
@@ -12,6 +12,7 @@
     PostgreSQLSource,
 )
 from feast.infra.utils.postgres.connection_utils import df_to_postgres_table
+from feast.infra.utils.postgres.postgres_config import PostgreSQLConfig
 from tests.integration.feature_repos.universal.data_source_creator import (
     DataSourceCreator,
 )
@@ -26,6 +27,10 @@
 POSTGRES_DB = "test"
 
 
+class PostgreSQLOnlineStoreConfig(PostgreSQLConfig):
+    type: Literal["postgres"] = "postgres"
+
+
 @pytest.fixture(scope="session")
 def postgres_container():
     container = (
@@ -106,17 +111,17 @@ def create_offline_store_config(self) -> PostgreSQLOfflineStoreConfig:
     def get_prefixed_table_name(self, suffix: str) -> str:
         return f"{self.project_name}_{suffix}"
 
-    def create_online_store(self) -> Dict[str, str]:
+    def create_online_store(self) -> PostgreSQLOnlineStoreConfig:
         assert self.container
-        return {
-            "type": "postgres",
-            "host": "localhost",
-            "port": self.container.get_exposed_port(5432),
-            "database": POSTGRES_DB,
-            "db_schema": "feature_store",
-            "user": POSTGRES_USER,
-            "password": POSTGRES_PASSWORD,
-        }
+        return PostgreSQLOnlineStoreConfig(
+            type="postgres",
+            host="localhost",
+            port=self.container.get_exposed_port(5432),
+            database=POSTGRES_DB,
+            db_schema="feature_store",
+            user=POSTGRES_USER,
+            password=POSTGRES_PASSWORD,
+        )
 
     def create_saved_dataset_destination(self):
         # FIXME: ...
 
@@ -470,7 +470,7 @@ def _to_df_internal(self, timeout: Optional[int] = None) -> pd.DataFrame:
     def _to_arrow_internal(self, timeout: Optional[int] = None) -> pyarrow.Table:
         pa_table = execute_snowflake_statement(
             self.snowflake_conn, self.to_sql()
-        ).fetch_arrow_all()
+        ).fetch_arrow_all(force_return_table=False)
 
         if pa_table:
             return pa_table