Github user ueshin commented on a diff in the pull request:
    --- Diff: 
    @@ -27,6 +27,14 @@ import org.apache.spark.sql.catalyst.trees.TreeNode
      * empty list should be returned.
     abstract class GenericStrategy[PhysicalPlan <: TreeNode[PhysicalPlan]] 
extends Logging {
    +  /**
    +   * 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
       def apply(plan: LogicalPlan): Seq[PhysicalPlan]
    --- End diff --
    I see, I'll include it. Thanks!

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