net.sf.farrago.fennel.rel
Class FennelDoubleRel

java.lang.Object
  org.eigenbase.rel.AbstractRelNode
      net.sf.farrago.fennel.rel.FennelDoubleRel

All Implemented Interfaces:

Cloneable, FennelRel, RelNode

Direct Known Subclasses:

FennelCartesianProductRel, FennelPullCorrelatorRel, LhxJoinRel

public abstract class FennelDoubleRel
extends AbstractRelNode
implements FennelRel

FennelDoubleRel is a FennelRel which takes two FennelRels as inputs.

Version:

$Id: //open/dev/farrago/src/net/sf/farrago/fennel/rel/FennelDoubleRel.java#1 $

Author:

John V. Sichi

Field Summary

protected RelNode	left
protected RelNode	right

Fields inherited from class org.eigenbase.rel.AbstractRelNode

digest, id, rowType, traits

Fields inherited from interface net.sf.farrago.query.FennelRel

FENNEL_EXEC_CONVENTION

Fields inherited from interface org.eigenbase.rel.RelNode

emptyArray

Constructor Summary

protected

FennelDoubleRel(RelOptCluster cluster, RelNode left, RelNode right) Creates a new FennelDoubleRel object.

Method Summary

protected RelDataType	deriveRowType()
RelFieldCollation[]	getCollations() TODO: jhyde, 2006/3/28: unify with RelNode.getCollationList()
FarragoTypeFactory	getFarragoTypeFactory()
private FennelRel	getFennelLeftInput() NOTE: this method is intentionally private because interactions between FennelRels must be mediated by FarragoRelImplementor.
private FennelRel	getFennelRightInput() NOTE: this method is intentionally private because interactions between FennelRels must be mediated by FarragoRelImplementor.
RelNode[]	getInputs() Returns an array of this relational expression's inputs.
Object	implementFennelChild(FennelRelImplementor implementor) Visits this relational expression as part of the implementation process.
void	replaceInput(int ordinalInParent, RelNode p) Replaces the ordinalInParentth input.

Methods inherited from class org.eigenbase.rel.AbstractRelNode

childrenAccept, clone, cloneTraits, collectVariablesSet, collectVariablesUsed, computeDigest, computeSelfCost, explain, getChildExps, getCluster, getCollationList, getConvention, getCorrelVariable, getDescription, getDigest, getExpectedInputRowType, getId, getInput, getOrCreateCorrelVariable, getQuery, getRelTypeName, getRows, getRowType, getTable, getTraits, getVariablesStopped, inheritTraitsFrom, isAccessTo, isDistinct, 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 net.sf.farrago.query.FennelRel

toStreamDef

Methods inherited from interface org.eigenbase.rel.RelNode

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

Field Detail

left

protected RelNode left

right

protected RelNode right

Constructor Detail

FennelDoubleRel

protected FennelDoubleRel(RelOptCluster cluster,
                          RelNode left,
                          RelNode right)

Creates a new FennelDoubleRel object.

Parameters:

cluster - RelOptCluster for this rel

left - left input

right - right input

Method Detail

getInputs

public RelNode[] getInputs()

Description copied from interface: RelNode

Returns an array of this relational expression's inputs. If there are no inputs, returns an empty array, not null.

Specified by:

getInputs in interface RelNode

Overrides:

getInputs in class AbstractRelNode

replaceInput

public void replaceInput(int ordinalInParent,
                         RelNode p)

Description copied from interface: RelNode

Replaces the ordinalInParent^th input. You must override this method if you override RelNode.getInputs().

Specified by:

replaceInput in interface RelNode

Overrides:

replaceInput in class AbstractRelNode

getFarragoTypeFactory

public FarragoTypeFactory getFarragoTypeFactory()

implementFennelChild

public Object implementFennelChild(FennelRelImplementor implementor)

Description copied from interface: FennelRel

Visits this relational expression as part of the implementation process. Fennel relational expressions are implemented in a two-phase process: first call this method, then call FennelRel.toStreamDef(net.sf.farrago.query.FennelRelImplementor).

Specified by:

implementFennelChild in interface FennelRel

deriveRowType

protected RelDataType deriveRowType()

Overrides:

deriveRowType in class AbstractRelNode

getFennelLeftInput

private FennelRel getFennelLeftInput()

NOTE: this method is intentionally private because interactions between FennelRels must be mediated by FarragoRelImplementor.

Returns:

this rel's left input, which must already have been converted to a FennelRel

getFennelRightInput

private FennelRel getFennelRightInput()

NOTE: this method is intentionally private because interactions between FennelRels must be mediated by FarragoRelImplementor.

Returns:

this rel's right input, which must already have been converted to a FennelRel

getCollations

public RelFieldCollation[] getCollations()

Description copied from interface: FennelRel

TODO: jhyde, 2006/3/28: unify with RelNode.getCollationList()

Specified by:

getCollations in interface FennelRel

Returns:

the sort order produced by this FennelRel, or an empty array if the output is not guaranteed to be in any particular order.