org.apache.flink.optimizer.traversals

类 IdAndEstimatesVisitor

java.lang.Object

org.apache.flink.optimizer.traversals.IdAndEstimatesVisitor

所有已实现的接口:

org.apache.flink.util.Visitor<OptimizerNode>

public class IdAndEstimatesVisitor
extends Object
implements org.apache.flink.util.Visitor<OptimizerNode>

This traversal of the optimizer DAG assigns IDs to each node (in a pre-order fashion), and calls each node to compute its estimates. The latter happens in the postVisit function, where it is guaranteed that all predecessors have computed their estimates.

构造器概要

构造器

构造器和说明
IdAndEstimatesVisitor(DataStatistics statistics)

方法概要

限定符和类型	方法和说明
void	postVisit(OptimizerNode visitable)
boolean	preVisit(OptimizerNode visitable)

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

构造器详细资料

IdAndEstimatesVisitor

public IdAndEstimatesVisitor(DataStatistics statistics)

方法详细资料

preVisit

public boolean preVisit(OptimizerNode visitable)

指定者:

preVisit 在接口中 org.apache.flink.util.Visitor<OptimizerNode>

postVisit

public void postVisit(OptimizerNode visitable)

指定者:

postVisit 在接口中 org.apache.flink.util.Visitor<OptimizerNode>