RelOptUtil.CorrelationCollector (Apache Calcite API)

java.lang.Object
- org.apache.calcite.rel.RelShuttleImpl
- - org.apache.calcite.rel.RelHomogeneousShuttle
  - - org.apache.calcite.plan.RelOptUtil.CorrelationCollector

All Implemented Interfaces:

RelShuttle

Enclosing class:

RelOptUtil
```
private static class RelOptUtil.CorrelationCollector
extends RelHomogeneousShuttle
```
Shuttle that finds correlation variables inside a given relational expression, including those that are inside sub-queries.

- Field Summary
  
  Fields
  Modifier and Type Field Description
  
  private RelOptUtil.VariableUsedVisitor vuv
  - Fields inherited from class org.apache.calcite.rel.RelShuttleImpl
    stack
- Constructor Summary
  
  Constructors
  Modifier Constructor Description
  
  private CorrelationCollector()
- Method Summary
  
  All Methods Instance Methods Concrete Methods
  Modifier and Type Method Description
  
  RelNode visit(RelNode other)
  - Methods inherited from class org.apache.calcite.rel.RelHomogeneousShuttle
    visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit
  - Methods inherited from class org.apache.calcite.rel.RelShuttleImpl
    visitChild, visitChildren
  - Methods inherited from class java.lang.Object
    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - vuv
```
private final RelOptUtil.VariableUsedVisitor vuv
```
- Constructor Detail
  - CorrelationCollector
```
private CorrelationCollector()
```
- Method Detail
  - visit
```
public RelNode visit(RelNode other)
```
    Specified by:
    
    visit in interface RelShuttle
    
    Overrides:
    
    visit in class RelShuttleImpl