feat: Enable Arrow-based columnar data transfers when to pandas in sp…

…arksource retrieval job

Signed-off-by: tanlocnguyen <tanlocnguyen296@gmail.com>

sdk/python/feast/infra/offline_stores/contrib/spark_offline_store/spark.py

@@ -338,6 +338,10 @@ def to_spark_df(self) -> pyspark.sql.DataFrame:
 
     def _to_df_internal(self, timeout: Optional[int] = None) -> pd.DataFrame:
         """Return dataset as Pandas DataFrame synchronously"""
+        spark_session = get_spark_session_or_start_new_with_repoconfig(self._config.offline_store)
+        spark_session.conf.set(
+            "spark.sql.execution.arrow.pyspark.enabled", "true"
+        )
         return self.to_spark_df().toPandas()
 
     def _to_arrow_internal(self, timeout: Optional[int] = None) -> pyarrow.Table:
@@ -442,7 +446,7 @@ def metadata(self) -> Optional[RetrievalMetadata]:
 def get_spark_session_or_start_new_with_repoconfig(
     store_config: SparkOfflineStoreConfig,
 ) -> SparkSession:
-    spark_session = SparkSession.getActiveSession()
+    spark_session = SparkSession.builder.getOrCreate()
     if not spark_session:
         spark_builder = SparkSession.builder
         spark_conf = store_config.spark_conf
@@ -457,7 +461,7 @@ def get_spark_session_or_start_new_with_repoconfig(
 
 
 def _get_entity_df_event_timestamp_range(
-    entity_df: Union[pd.DataFrame, str],
+    entity_df: Union[pd.DataFrame, str, pyspark.sql.DataFrame],
     entity_df_event_timestamp_col: str,
     spark_session: SparkSession,
 ) -> Tuple[datetime, datetime]:
@@ -496,7 +500,8 @@ def _get_entity_df_event_timestamp_range(
 
 
 def _get_entity_schema(
-    spark_session: SparkSession, entity_df: Union[pandas.DataFrame, str]
+    spark_session: SparkSession,
+    entity_df: Union[pandas.DataFrame, str, pyspark.sql.DataFrame],
 ) -> Dict[str, np.dtype]:
     if isinstance(entity_df, pd.DataFrame):
         return dict(zip(entity_df.columns, entity_df.dtypes))
@@ -518,7 +523,7 @@ def _get_entity_schema(
 def _upload_entity_df(
     spark_session: SparkSession,
     table_name: str,
-    entity_df: Union[pandas.DataFrame, str],
+    entity_df: Union[pandas.DataFrame, str, pyspark.sql.DataFrame],
     event_timestamp_col: str,
 ) -> None:
     if isinstance(entity_df, pd.DataFrame):