RelOptUtil.VariableUsedVisitor (Apache Calcite API)

java.lang.Object
- org.apache.calcite.rex.RexShuttle
- - org.apache.calcite.plan.RelOptUtil.VariableUsedVisitor

All Implemented Interfaces:

RexVisitor<RexNode>

Enclosing class:

RelOptUtil
```
public static class RelOptUtil.VariableUsedVisitor
extends RexShuttle
```
Visitor that finds all variables used in an expression.

Field Summary

Fields
Modifier and Type	Field	Description
`private RelShuttle`	`relShuttle`
`com.google.common.collect.Multimap<CorrelationId,java.lang.Integer>`	`variableFields`
`java.util.Set<CorrelationId>`	`variables`

Constructor Summary

Constructors
Constructor Description

VariableUsedVisitor(RelShuttle relShuttle)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`RexNode`	`visitCorrelVariable(RexCorrelVariable p)`
`RexNode`	`visitFieldAccess(RexFieldAccess fieldAccess)`
`RexNode`	`visitSubQuery(RexSubQuery subQuery)`

Methods inherited from class org.apache.calcite.rex.RexShuttle
apply, apply, apply, mutate, visitArray, visitCall, visitDynamicParam, visitFieldCollations, visitInputRef, visitList, visitList, visitLiteral, visitLocalRef, visitOver, visitPatternFieldRef, visitRangeRef, visitTableInputRef, visitWindow

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - variables
```
public final java.util.Set<CorrelationId> variables
```
  - variableFields
```
public final com.google.common.collect.Multimap<CorrelationId,java.lang.Integer> variableFields
```
  - relShuttle
```
private final RelShuttle relShuttle
```
- Constructor Detail
  - VariableUsedVisitor
```
public VariableUsedVisitor(RelShuttle relShuttle)
```
- Method Detail
  - visitCorrelVariable
```
public RexNode visitCorrelVariable(RexCorrelVariable p)
```
    Specified by:
    
    visitCorrelVariable in interface RexVisitor<RexNode>
    
    Overrides:
    
    visitCorrelVariable in class RexShuttle
  - visitFieldAccess
```
public RexNode visitFieldAccess(RexFieldAccess fieldAccess)
```
    Specified by:
    
    visitFieldAccess in interface RexVisitor<RexNode>
    
    Overrides:
    
    visitFieldAccess in class RexShuttle
  - visitSubQuery
```
public RexNode visitSubQuery(RexSubQuery subQuery)
```
    Specified by:
    
    visitSubQuery in interface RexVisitor<RexNode>
    
    Overrides:
    
    visitSubQuery in class RexShuttle