net.sf.farrago.query
Class IteratorToFennelConverter.IteratorToFennelPullRule

java.lang.Object
  org.eigenbase.relopt.RelOptRule
      org.eigenbase.rel.convert.ConverterRule
          net.sf.farrago.query.IteratorToFennelConverter.IteratorToFennelPullRule

Enclosing class:

IteratorToFennelConverter

private static class IteratorToFennelConverter.IteratorToFennelPullRule
extends ConverterRule

Rule which converts a RelNode of Fennel calling convention to iterator calling convention by adding a IteratorToFennelConverter.

Field Summary

Fields inherited from class org.eigenbase.relopt.RelOptRule

ANY, description, operands

Constructor Summary

private

IteratorToFennelConverter.IteratorToFennelPullRule()

Method Summary

RelNode	convert(RelNode rel)
boolean	isGuaranteed() Returns true if this rule can convert any relational expression of the input convention.

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

getInTrait, getOutConvention, getOutTrait, getTraitDef, 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

Constructor Detail

IteratorToFennelConverter.IteratorToFennelPullRule

private IteratorToFennelConverter.IteratorToFennelPullRule()

Method Detail

convert

public RelNode convert(RelNode rel)

Specified by:

convert in class ConverterRule

isGuaranteed

public boolean isGuaranteed()

Description copied from class: ConverterRule

Returns true if this rule can convert any relational expression of the input convention.

The union-to-java converter, for example, is not guaranteed, because it only works on unions.

Overrides:

isGuaranteed in class ConverterRule