net.sf.farrago.fennel.rel
Class LhxAggRel

java.lang.Object
  org.eigenbase.rel.AbstractRelNode
      org.eigenbase.rel.SingleRel
          org.eigenbase.rel.AggregateRelBase
              net.sf.farrago.fennel.rel.LhxAggRel

All Implemented Interfaces:

Cloneable, FennelRel, RelNode

public class LhxAggRel
extends AggregateRelBase
implements FennelRel

LhxAggRel represents hash aggregation.

Version:

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

Author:

Rushan Chen

Nested Class Summary

Nested classes/interfaces inherited from class org.eigenbase.rel.AggregateRelBase

AggregateRelBase.AggCallBinding

Field Summary

(package private) long	cndGroupByKey cardinality of the group by key
(package private) long	numInputRows row count of the input

Fields inherited from class org.eigenbase.rel.AggregateRelBase

aggCalls, groupCount

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

LhxAggRel(RelOptCluster cluster, RelNode child, int groupCount, List<AggregateCall> aggCalls, long numInputRows, long cndGroupByKey)
Creates a LhxAggRel.

Method Summary

LhxAggRel	clone() Clones this RelNode.
RelFieldCollation[]	getCollations() TODO: jhyde, 2006/3/28: unify with RelNode.getCollationList()
Object	implementFennelChild(FennelRelImplementor implementor) Visits this relational expression as part of the implementation process.
FemExecutionStreamDef	toStreamDef(FennelRelImplementor implementor) Converts this relational expression to FemExecutionStreamDef form.

Methods inherited from class org.eigenbase.rel.AggregateRelBase

computeSelfCost, containsDistinctCall, deriveRowType, explain, getAggCallList, getGroupCount, getRows, isDistinct

Methods inherited from class org.eigenbase.rel.SingleRel

childrenAccept, getChild, getInputs, replaceInput

Methods inherited from class org.eigenbase.rel.AbstractRelNode

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.RelNode

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

Field Detail

numInputRows

long numInputRows

row count of the input

cndGroupByKey

long cndGroupByKey

cardinality of the group by key

Constructor Detail

LhxAggRel

public LhxAggRel(RelOptCluster cluster,
                 RelNode child,
                 int groupCount,
                 List<AggregateCall> aggCalls,
                 long numInputRows,
                 long cndGroupByKey)

Creates a LhxAggRel.

Parameters:

cluster - Cluster

child - Child

groupCount - Size of grouping key

aggCalls - Collection of calls to aggregate functions

numInputRows - Row count of the input

cndGroupByKey - Cardinality of the grouping key

Method Detail

clone

public LhxAggRel 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

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.

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

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.

Specified by:

toStreamDef in interface FennelRel

Parameters:

implementor - for generating Java code

Returns:

generated FemExecutionStreamDef