org.eigenbase.rel.convert
Class ConverterRelImpl

java.lang.Object
  org.eigenbase.rel.AbstractRelNode
      org.eigenbase.rel.SingleRel
          org.eigenbase.rel.convert.ConverterRelImpl

All Implemented Interfaces:

Cloneable, ConverterRel, RelNode

Direct Known Subclasses:

AbstractConverter, FennelToIteratorConverter, IteratorToFennelConverter, NoneConverterRel, ResultSetToFarragoIteratorConverter, VolcanoPlannerTest.PhysToIteratorConverter, VolcanoPlannerTraitTest.AltTraitConverter, VolcanoPlannerTraitTest.PhysToIteratorConverter

public abstract class ConverterRelImpl
extends SingleRel
implements ConverterRel

Abstract implementation of ConverterRel.

Version:

$Id: //open/dev/farrago/src/org/eigenbase/rel/convert/ConverterRelImpl.java#5 $

Author:

jhyde

Field Summary

protected RelTraitSet	inTraits
protected RelTraitDef	traitDef

Fields inherited from class org.eigenbase.rel.AbstractRelNode

digest, id, rowType, traits

Fields inherited from interface org.eigenbase.rel.RelNode

emptyArray

Constructor Summary

protected

ConverterRelImpl(RelOptCluster cluster, RelTraitDef traitDef, RelTraitSet traits, RelNode child) Creates a ConverterRelImpl.

Method Summary

protected Error	cannotImplement()
RelOptCost	computeSelfCost(RelOptPlanner planner) Returns the cost of this plan (not including children).
protected static RelTraitSet	convertTraits(RelTraitSet traits, RelTrait trait) Returns a new trait set based on traits, with a different trait for a given type of trait.
protected CallingConvention	getInputConvention()
RelTraitSet	getInputTraits() Returns the trait of the input relational expression.
RelTraitDef	getTraitDef() Returns the definition of trait which this converter works on.
boolean	isDistinct() Returns whether the same value will not come out twice.

Methods inherited from class org.eigenbase.rel.SingleRel

childrenAccept, deriveRowType, explain, getChild, getInputs, getRows, replaceInput

Methods inherited from class org.eigenbase.rel.AbstractRelNode

clone, cloneTraits, collectVariablesSet, collectVariablesUsed, computeDigest, getChildExps, getCluster, getCollationList, getConvention, getCorrelVariable, getDescription, getDigest, getExpectedInputRowType, getId, getInput, getOrCreateCorrelVariable, getQuery, getRelTypeName, getRowType, getTable, getTraits, getVariablesStopped, inheritTraitsFrom, isAccessTo, isValid, onRegister, recomputeDigest, register, registerCorrelVariable, setCorrelVariable, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.eigenbase.rel.convert.ConverterRel

getChild

Methods inherited from interface org.eigenbase.rel.RelNode

childrenAccept, clone, collectVariablesSet, collectVariablesUsed, explain, getChildExps, getCluster, getCollationList, getConvention, getCorrelVariable, getDescription, getDigest, getExpectedInputRowType, getId, getInput, getInputs, getOrCreateCorrelVariable, getQuery, getRelTypeName, getRows, getRowType, getTable, getTraits, getVariablesStopped, isAccessTo, isValid, onRegister, recomputeDigest, registerCorrelVariable, replaceInput, setCorrelVariable

Field Detail

inTraits

protected RelTraitSet inTraits

traitDef

protected final RelTraitDef traitDef

Constructor Detail

ConverterRelImpl

protected ConverterRelImpl(RelOptCluster cluster,
                           RelTraitDef traitDef,
                           RelTraitSet traits,
                           RelNode child)

Creates a ConverterRelImpl.

Parameters:

cluster - planner's cluster

traitDef - the RelTraitDef this converter converts

traits - the output traits of this converter

child - child rel (provides input traits)

Method Detail

computeSelfCost

public RelOptCost computeSelfCost(RelOptPlanner planner)

Description copied from interface: RelNode

Returns the cost of this plan (not including children). The base implementation throws an error; derived classes should override.

NOTE jvs 29-Mar-2006: Don't call this method directly. Instead, use RelMetadataQuery.getNonCumulativeCost(org.eigenbase.rel.RelNode), which gives plugins a chance to override the rel's default ideas about cost.

Specified by:

computeSelfCost in interface RelNode

Overrides:

computeSelfCost in class AbstractRelNode

cannotImplement

protected Error cannotImplement()

isDistinct

public boolean isDistinct()

Description copied from interface: RelNode

Returns whether the same value will not come out twice. Default value is false, derived classes should override.

Specified by:

isDistinct in interface RelNode

Overrides:

isDistinct in class AbstractRelNode

getInputConvention

protected CallingConvention getInputConvention()

getInputTraits

public RelTraitSet getInputTraits()

Description copied from interface: ConverterRel

Returns the trait of the input relational expression.

Specified by:

getInputTraits in interface ConverterRel

Returns:

input trait

getTraitDef

public RelTraitDef getTraitDef()

Description copied from interface: ConverterRel

Returns the definition of trait which this converter works on.

The input relational expression (matched by the rule) must possess this trait and have the value given by ConverterRel.getInputTraits(), and the traits of the output of this converter given by RelNode.getTraits() will have one trait altered and the other orthogonal traits will be the same.

Specified by:

getTraitDef in interface ConverterRel

Returns:

trait which this converter modifies

convertTraits

protected static RelTraitSet convertTraits(RelTraitSet traits,
                                           RelTrait trait)

Returns a new trait set based on traits, with a different trait for a given type of trait. Clones traits, and then replaces the existing trait matching trait.getTraitDef() with trait.

Parameters:

traits - the set of traits to convert

trait - the converted trait

Returns:

a new RelTraitSet