SpineGroup# You can obtain a SpineGroup by calling FeatureStore.get_or_create_spine_group. [source] SpineGroup # Bases: FeatureGroupBase [source] dataframe property writable # dataframe: ( pd.DataFrame | TypeVar("pyspark.sql.DataFrame") | None ) Spine dataframe with primary key, event time and label column to use for point in time join when fetching features.