net.sf.farrago.fennel.rel
Class FennelEmptyRule

java.lang.Object
  org.eigenbase.relopt.RelOptRule
      org.eigenbase.rel.convert.ConverterRule
          net.sf.farrago.fennel.rel.FennelEmptyRule

public class FennelEmptyRule
extends ConverterRule

FennelEmptyRule provides an implementation for EmptyRel in terms of FennelValuesRel.

Version:

$Id: //open/dev/farrago/src/net/sf/farrago/fennel/rel/FennelEmptyRule.java#3 $

Author:

jhyde

Field Summary

static FennelEmptyRule

instance Singleton instance of this rule.

Fields inherited from class org.eigenbase.relopt.RelOptRule

ANY, description, operands

Constructor Summary

private

FennelEmptyRule() Creates a FennelEmptyRule.

Method Summary

RelNode

convert(RelNode rel)

Methods inherited from class org.eigenbase.rel.convert.ConverterRule

getInTrait, getOutConvention, getOutTrait, getTraitDef, isGuaranteed, onMatch

Methods inherited from class org.eigenbase.relopt.RelOptRule

convert, equals, equals, getOperand, getOperands, hashCode, matches, mergeTraitsAndConvert, mergeTraitsAndConvert, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

instance

public static final FennelEmptyRule instance

Singleton instance of this rule.

Constructor Detail

FennelEmptyRule

private FennelEmptyRule()

Creates a FennelEmptyRule.

Method Detail

convert

public RelNode convert(RelNode rel)

Specified by:

convert in class ConverterRule