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abstract class QueryPlanner[PhysicalPlan <: TreeNode[PhysicalPlan]] extends AnyRef

Abstract class for transforming LogicalPlans into physical plans. Child classes are responsible for specifying a list of GenericStrategy objects that each of which can return a list of possible physical plan options. If a given strategy is unable to plan all of the remaining operators in the tree, it can call planLater, which returns a placeholder object that will be collected and filled in using other available strategies.

TODO: RIGHT NOW ONLY ONE PLAN IS RETURNED EVER... PLAN SPACE EXPLORATION WILL BE IMPLEMENTED LATER.

PhysicalPlan

The type of physical plan produced by this QueryPlanner

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Instance Constructors

  1. new QueryPlanner()

Abstract Value Members

  1. abstract def collectPlaceholders(plan: PhysicalPlan): Seq[(PhysicalPlan, LogicalPlan)]

    Collects placeholders marked using planLater by strategies.

    Collects placeholders marked using planLater by strategies.

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  2. abstract def prunePlans(plans: Iterator[PhysicalPlan]): Iterator[PhysicalPlan]

    Prunes bad plans to prevent combinatorial explosion.

    Prunes bad plans to prevent combinatorial explosion.

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  3. abstract def strategies: Seq[GenericStrategy[PhysicalPlan]]

    A list of execution strategies that can be used by the planner

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  15. def plan(plan: LogicalPlan): Iterator[PhysicalPlan]
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