net.sf.saffron.rel
Class SwapJoinRule.VariableReplacer

java.lang.Object
  |
  +--net.sf.saffron.rel.SwapJoinRule.VariableReplacer

Enclosing class:

SwapJoinRule

private static class SwapJoinRule.VariableReplacer

extends Object

Walks over an expression, replacing references to fields of the left and right inputs.

If the field index is less than leftFieldCount, it must be from the left, and so has rightFieldCount added to it; if the field index is greater than leftFieldCount, it must be from the right, so we subtract leftFieldCount from it.

Field Summary

private SaffronField[]	leftFields
private RexBuilder	rexBuilder
private SaffronField[]	rightFields

Constructor Summary

(package private)

SwapJoinRule.VariableReplacer(RexBuilder rexBuilder, SaffronType leftType, SaffronType rightType)

Method Summary

RexNode

go(RexNode rex)

Methods inherited from class java.lang.Object

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

Field Detail

rexBuilder

private final RexBuilder rexBuilder

leftFields

private final SaffronField[] leftFields

rightFields

private final SaffronField[] rightFields

Constructor Detail

SwapJoinRule.VariableReplacer

SwapJoinRule.VariableReplacer(RexBuilder rexBuilder,
                              SaffronType leftType,
                              SaffronType rightType)

Method Detail

go

public RexNode go(RexNode rex)