Class FennelAggRel

  extended by org.eigenbase.rel.AbstractRelNode
      extended by org.eigenbase.rel.SingleRel
          extended by org.eigenbase.rel.AggregateRelBase
              extended by net.sf.farrago.fennel.rel.FennelAggRel
All Implemented Interfaces:
Cloneable, FennelRel, RelNode
Direct Known Subclasses:

public class FennelAggRel
extends AggregateRelBase
implements FennelRel

FennelAggRel represents the Fennel implementation of aggregation.

$Id: //open/dev/farrago/src/net/sf/farrago/fennel/rel/ $
John V. Sichi

Nested Class Summary
Nested classes/interfaces inherited from class org.eigenbase.rel.AggregateRelBase
Field Summary
protected  FarragoRepos repos
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
Fields inherited from interface org.eigenbase.rel.RelNode
Constructor Summary
FennelAggRel(RelOptCluster cluster, RelNode child, int groupCount, List<AggregateCall> aggCalls)
          Creates a FennelAggRel.
Method Summary
 FennelAggRel 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


protected final FarragoRepos repos
Constructor Detail


public FennelAggRel(RelOptCluster cluster,
                    RelNode child,
                    int groupCount,
                    List<AggregateCall> aggCalls)
Creates a FennelAggRel.

cluster - Cluster
child - Child
groupCount - Size of grouping key
aggCalls - Collection of calls to aggregate functions
Method Detail


public FennelAggRel 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(...);
         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
a clone of this RelNode


public RelFieldCollation[] getCollations()
Description copied from interface: FennelRel

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

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


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


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
implementor - for generating Java code
generated FemExecutionStreamDef