CostEvaluator¶

CostEvaluator is an abstraction of cost evaluators in Adaptive Query Execution.

CostEvaluator is used in AdaptiveSparkPlanExec physical operator based on spark.sql.adaptive.customCostEvaluatorClass configuration property.

Contract¶

Evaluating Cost¶

evaluateCost(
  plan: SparkPlan): Cost

Evaluates the cost of the given SparkPlan

Used when:

• AdaptiveSparkPlanExec physical operator is requested for the final physical query plan

Implementations¶

• SimpleCostEvaluator