Github user marmbrus commented on a diff in the pull request:

    https://github.com/apache/spark/pull/13147#discussion_r90560927
  
    --- Diff: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/planning/QueryPlanner.scala
 ---
    @@ -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 --
    
    Fine to include it there!  I guess I need to review that :)


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