spark技术分享SparkStrategy — Base for Execution Planning Strategies
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.
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planLater(plan: LogicalPlan): SparkPlan = PlanLater(plan) |
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