IdAndEstimatesVisitor (Flink : Optimizer 1.19.2-cp2 API)

java.lang.Object
- org.apache.flink.optimizer.traversals.IdAndEstimatesVisitor

All Implemented Interfaces:

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.

- Constructor Summary
  
  Constructors
  Constructor Description
  
  IdAndEstimatesVisitor(DataStatistics statistics)
- Method Summary
  
  All Methods Instance Methods Concrete Methods
  Modifier and Type Method Description
  
  void postVisit(OptimizerNode visitable)
  
  boolean preVisit(OptimizerNode visitable)
  - Methods inherited from class java.lang.Object
    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - IdAndEstimatesVisitor
```
public IdAndEstimatesVisitor(DataStatistics statistics)
```
- Method Detail
  - preVisit
```
public boolean preVisit(OptimizerNode visitable)
```
    Specified by:
    
    preVisit in interface org.apache.flink.util.Visitor<OptimizerNode>
  - postVisit
```
public void postVisit(OptimizerNode visitable)
```
    Specified by:
    
    postVisit in interface org.apache.flink.util.Visitor<OptimizerNode>