Github user marmbrus commented on a diff in the pull request: https://github.com/apache/spark/pull/13147#discussion_r63567938 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/planning/QueryPlanner.scala --- @@ -27,6 +27,16 @@ import org.apache.spark.sql.catalyst.trees.TreeNode * empty list should be returned. */ abstract class GenericStrategy[PhysicalPlan <: TreeNode[PhysicalPlan]] extends Logging { + + def planner: QueryPlanner[PhysicalPlan] + + /** + * Returns a placeholder for a physical plan that executes `plan`. This placeholder will be + * filled in automatically by the QueryPlanner using the other execution strategies that are + * available. + */ + protected def planLater(plan: LogicalPlan): PhysicalPlan = planner.plan(plan).next() --- End diff -- Calling `next()` here has always been a hack (there used to be a TODO).
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