com.lucidera.lcs
Class LcsIndexMinusRel

java.lang.Object
  org.eigenbase.rel.AbstractRelNode
      net.sf.farrago.fennel.rel.FennelMultipleRel
          com.lucidera.lcs.LcsIndexBitOpRel
              com.lucidera.lcs.LcsIndexMinusRel

All Implemented Interfaces:

Cloneable, FennelRel, RelNode

public class LcsIndexMinusRel
extends LcsIndexBitOpRel

LcsIndexMinusRel is a relation for "subtracting" the 2nd through Nth inputs from the first input. The input to this relation must be more than one.

Version:

$Id: //open/dev/farrago/src/com/lucidera/lcs/LcsIndexMinusRel.java#10 $

Author:

Zelaine Fong

Field Summary

Fields inherited from class com.lucidera.lcs.LcsIndexBitOpRel

lcsTable, rowLimitParamId, startRidParamId

Fields inherited from class net.sf.farrago.fennel.rel.FennelMultipleRel

inputs

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

LcsIndexMinusRel(RelOptCluster cluster, RelNode[] inputs, LcsTable lcsTable, FennelRelParamId startRidParamId, FennelRelParamId rowLimitParamId)

Method Summary

LcsIndexMinusRel	clone() Clones this RelNode.
double	getRows() Returns an estimate of the number of rows this relational expression will return.
FemExecutionStreamDef	toStreamDef(FennelRelImplementor implementor) Converts this relational expression to FemExecutionStreamDef form.

Methods inherited from class com.lucidera.lcs.LcsIndexBitOpRel

computeSelfCost, deriveRowType, explain, getRowLimitParamId, getStartRidParamId, setBitOpChildStreams

Methods inherited from class net.sf.farrago.fennel.rel.FennelMultipleRel

getCollations, getFarragoTypeFactory, getInputs, implementFennelChild, replaceInput

Methods inherited from class org.eigenbase.rel.AbstractRelNode

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

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

Constructor Detail

LcsIndexMinusRel

public LcsIndexMinusRel(RelOptCluster cluster,
                        RelNode[] inputs,
                        LcsTable lcsTable,
                        FennelRelParamId startRidParamId,
                        FennelRelParamId rowLimitParamId)

Method Detail

clone

public LcsIndexMinusRel 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

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 AbstractRelNode

toStreamDef

public FemExecutionStreamDef toStreamDef(FennelRelImplementor implementor)

Description copied from interface: FennelRel

Converts this relational expression to FemExecutionStreamDef form. In the process, the relational expression will almost certainly call FennelRelImplementor.visitFennelChild(net.sf.farrago.query.FennelRel, int) on each of its children.

Parameters:

implementor - for generating Java code

Returns:

generated FemExecutionStreamDef