org.apache.calcite.plan

Class RelOptUtil.VariableSetVisitor

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 and Description
(package private) Set<CorrelationId>	variables

Constructor Summary

Constructors

Modifier	Constructor and Description
private	VariableSetVisitor()

Method Summary

Modifier and Type	Method and 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 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