RelOptUtil.VariableSetVisitor (Apache Calcite API)

java.lang.Object
- org.apache.calcite.rel.RelVisitor
- - org.apache.calcite.plan.RelOptUtil.VariableSetVisitor

Enclosing class:

RelOptUtil
```
private static class RelOptUtil.VariableSetVisitor
extends RelVisitor
```
Visitor that finds all variables used but not stopped in an expression.

- Field Summary
  
  Fields
  Modifier and Type Field Description
  
  (package private) java.util.Set<CorrelationId> variables
- Constructor Summary
  
  Constructors
  Modifier Constructor Description
  
  private VariableSetVisitor()
- Method Summary
  
  All Methods Instance Methods Concrete Methods
  Modifier and Type Method Description
  
  void visit(RelNode p, int ordinal, RelNode parent)
  Visits a node during a traversal.
  - Methods inherited from class org.apache.calcite.rel.RelVisitor
    go, replaceRoot
  - Methods inherited from class java.lang.Object
    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - variables
```
final java.util.Set<CorrelationId> variables
```
- Constructor Detail
  - VariableSetVisitor
```
private VariableSetVisitor()
```
- Method Detail
  - visit
```
public void visit(RelNode p,
                  int ordinal,
                  RelNode parent)
```
    Description copied from class: RelVisitor
    
    Visits a node during a traversal.
    
    Overrides:
    
    visit in class RelVisitor
    
    Parameters:
    
    p - Node to visit
    
    ordinal - Ordinal of node within its parent
    
    parent - Parent of the node, or null if it is the root of the traversal