org.eigenbase.rel.rules
Class SwapJoinRule.VariableReplacer

java.lang.Object
  org.eigenbase.rel.rules.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 RelDataTypeField[]	leftFields
private RexBuilder	rexBuilder
private RelDataTypeField[]	rightFields

Constructor Summary

SwapJoinRule.VariableReplacer(RexBuilder rexBuilder, RelDataType leftType, RelDataType 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 RelDataTypeField[] leftFields

rightFields

private final RelDataTypeField[] rightFields

Constructor Detail

SwapJoinRule.VariableReplacer

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

Method Detail

go

public RexNode go(RexNode rex)