SparkStrategy is a Catalyst GenericStrategy that converts a logical plan into zero or more physical plans.
SparkStrategy marks logical plans (i.e. LogicalPlan) to be planned later (by some other SparkStrategy or after other SparkStrategy strategies have finished) using PlanLater physical operator.
planLater(plan: LogicalPlan): SparkPlan = PlanLater(plan)
SparkStrategy is used as Strategy type alias (aka type synonym) in Spark’s code base that is defined in org.apache.spark.sql package object, i.e.
type Strategy = SparkStrategy