InternalSparkApi
@Target(allowedTargets = [AnnotationTarget.CLASS, AnnotationTarget.FUNCTION, AnnotationTarget.TYPEALIAS, AnnotationTarget.PROPERTY] )
Marks declarations that are internal in Spark API, which means that should not be used outside of com.adevinta.spark, because their signatures and semantics will change between future releases without any warnings and without providing any migration guide.