net.sf.farrago.namespace.mdr
Class MedMdrJoinRel

java.lang.Object
  org.eigenbase.rel.AbstractRelNode
      org.eigenbase.rel.JoinRelBase
          net.sf.farrago.namespace.mdr.MedMdrJoinRel

All Implemented Interfaces:

Cloneable, JavaRel, RelNode

 class MedMdrJoinRel
extends JoinRelBase
implements JavaRel

MedMdrJoinRel is the relational expression corresponding to a join via association to an MedMdrClassExtent on the right hand side.

Version:

$Id: //open/dev/farrago/src/net/sf/farrago/namespace/mdr/MedMdrJoinRel.java#21 $

Author:

John V. Sichi

Field Summary

private int	leftOrdinal
private Reference	rightReference

Fields inherited from class org.eigenbase.rel.JoinRelBase

condition, joinType, left, right, variablesStopped

Fields inherited from class org.eigenbase.rel.AbstractRelNode

digest, id, rowType, traits

Fields inherited from interface org.eigenbase.rel.RelNode

emptyArray

Constructor Summary

MedMdrJoinRel(RelOptCluster cluster, RelNode left, RelNode right, RexNode condition, JoinRelType joinType, int leftOrdinal, Reference rightReference)

Method Summary

MedMdrJoinRel	clone() Clones this RelNode.
RelOptCost	computeSelfCost(RelOptPlanner planner) Returns the cost of this plan (not including children).
(package private) int	getLeftOrdinal()
(package private) Reference	getRightReference()
double	getRows() Returns an estimate of the number of rows this relational expression will return.
ParseTree	implement(JavaRelImplementor implementor) Creates a plan for this expression according to a calling convention.

Methods inherited from class org.eigenbase.rel.JoinRelBase

_isValid, childrenAccept, createJoinType, deriveJoinRowType, deriveRowType, estimateJoinedRows, explain, getChildExps, getCondition, getInputs, getJoinType, getLeft, getRight, getSystemFieldList, getVariablesStopped, registerStoppedVariable, replaceInput, setVariablesStopped

Methods inherited from class org.eigenbase.rel.AbstractRelNode

cloneTraits, collectVariablesSet, collectVariablesUsed, computeDigest, getCluster, getCollationList, getConvention, getCorrelVariable, getDescription, getDigest, getExpectedInputRowType, getId, getInput, getOrCreateCorrelVariable, getQuery, getRelTypeName, getRowType, getTable, getTraits, 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 org.eigenbase.rel.RelNode

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

Field Detail

leftOrdinal

private int leftOrdinal

rightReference

private Reference rightReference

Constructor Detail

MedMdrJoinRel

MedMdrJoinRel(RelOptCluster cluster,
              RelNode left,
              RelNode right,
              RexNode condition,
              JoinRelType joinType,
              int leftOrdinal,
              Reference rightReference)

Method Detail

getLeftOrdinal

int getLeftOrdinal()

getRightReference

Reference getRightReference()

clone

public MedMdrJoinRel clone()

Description copied from interface: RelNode

Clones this RelNode.

Traits of the RelNode must be explicitly cloned, using AbstractRelNode.inheritTraitsFrom(AbstractRelNode), as the RelNode may have traits of which it has no knowledge. Example implementation:

     public MyRelNode clone()
     {
         MyRelNode clone = new MyRelNode(...);
         clone.inheritTraitsFrom(this);
         return clone;
     }
 

N.B.: This method must be overridden whenever an existing, concrete RelNode is extended. Otherwise, calling clone() will produce a differently typed RelNode, resulting in invalid or incorrect query plans.

Specified by:

clone in interface RelNode

Specified by:

clone in class AbstractRelNode

Returns:

a clone of this RelNode

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 JoinRelBase

getRows

public double getRows()

Description copied from interface: RelNode

Returns an estimate of the number of rows this relational expression will return.

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

Specified by:

getRows in interface RelNode

Overrides:

getRows in class JoinRelBase

implement

public ParseTree implement(JavaRelImplementor implementor)

Description copied from interface: JavaRel

Creates a plan for this expression according to a calling convention.

Specified by:

implement in interface JavaRel

Parameters:

implementor - implementor