net.sf.saffron.rex
Class RexCorrelVariable

java.lang.Object
  |
  +--net.sf.saffron.rex.RexNode
        |
        +--net.sf.saffron.rex.RexVariable
              |
              +--net.sf.saffron.rex.RexCorrelVariable

public class RexCorrelVariable

extends RexVariable

Reference to the current row of a correlating relational expression.

Correlating variables are introduced when performing nested loop joins. Each row is received from one side of the join, a correlating variable is assigned a value, and the other side of the join is restarted.

Since:

Nov 24, 2003

Version:

$Id: $

Author:

jhyde

Field Summary

Fields inherited from class net.sf.saffron.rex.RexVariable

name, type

Fields inherited from class net.sf.saffron.rex.RexNode

digest

Constructor Summary

(package private)

RexCorrelVariable(String varName, SaffronType type)

Method Summary

Object

clone()

Methods inherited from class net.sf.saffron.rex.RexVariable

getName, getType

Methods inherited from class net.sf.saffron.rex.RexNode

getKind, isA, isAlwaysTrue, toString

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

RexCorrelVariable

RexCorrelVariable(String varName,
                  SaffronType type)

Method Detail

clone

public Object clone()

Specified by:

clone in class RexNode