object ExpressionCanonicalizer extends RuleExecutor[Expression]
Canonicalizes an expression so those that differ only by names can reuse the same code.
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- case class Batch(name: String, strategy: Strategy, rules: Rule[TreeType]*) extends Product with Serializable
A batch of rules.
A batch of rules.
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- RuleExecutor
- case class FixedPoint(maxIterations: Int, errorOnExceed: Boolean = false, maxIterationsSetting: String = null) extends Strategy with Product with Serializable
A strategy that runs until fix point or maxIterations times, whichever comes first.
A strategy that runs until fix point or maxIterations times, whichever comes first. Especially, a FixedPoint(1) batch is supposed to run only once.
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- RuleExecutor
- abstract class Strategy extends AnyRef
An execution strategy for rules that indicates the maximum number of executions.
An execution strategy for rules that indicates the maximum number of executions. If the execution reaches fix point (i.e. converge) before maxIterations, it will stop.
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- RuleExecutor
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- val batches: List[Batch]
Defines a sequence of rule batches, to be overridden by the implementation.
Defines a sequence of rule batches, to be overridden by the implementation.
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- ExpressionCanonicalizer → RuleExecutor
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- val excludedOnceBatches: Set[String]
Once batches that are excluded in the idempotence checker
Once batches that are excluded in the idempotence checker
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- RuleExecutor
- def execute(plan: Expression): Expression
Executes the batches of rules defined by the subclass.
Executes the batches of rules defined by the subclass. The batches are executed serially using the defined execution strategy. Within each batch, rules are also executed serially.
- Definition Classes
- RuleExecutor
- def executeAndTrack(plan: Expression, tracker: QueryPlanningTracker): Expression
Executes the batches of rules defined by the subclass, and also tracks timing info for each rule using the provided tracker.
Executes the batches of rules defined by the subclass, and also tracks timing info for each rule using the provided tracker.
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- RuleExecutor
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- def validatePlanChanges(previousPlan: Expression, currentPlan: Expression): Option[String]
Defines a validate function that validates the plan changes after the execution of each rule, to make sure these rules make valid changes to the plan.
Defines a validate function that validates the plan changes after the execution of each rule, to make sure these rules make valid changes to the plan. For example, we can check whether a plan is still resolved after each rule in
Optimizer, so that we can catch rules that turn the plan into unresolved.- Attributes
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- RuleExecutor
- final def wait(): Unit
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- object CleanExpressions extends Rule[Expression]
- case object Once extends Strategy with Product with Serializable
A strategy that is run once and idempotent.
A strategy that is run once and idempotent.
- Definition Classes
- RuleExecutor