GenericStrategy — Planning Strategies¶
GenericStrategy is an abstraction of planning strategies of QueryPlanner.
Type Constructor and PhysicalPlan Type¶
GenericStrategy is a type constructor in Scala (generic class in Java) with the following definition:
abstract class GenericStrategy[PhysicalPlan <: TreeNode[PhysicalPlan]]
GenericStrategy uses PhysicalPlan as the name of a type that is a subtype of TreeNode and for which a concrete class can be created (e.g. SparkStrategy).
Contract¶
Executing Rule¶
apply(
plan: LogicalPlan): Seq[PhysicalPlan]
Executes the planning strategy (to generate a TreeNode)
planLater¶
planLater(
plan: LogicalPlan): PhysicalPlan