net.sf.saffron.rel
Class SortRel

java.lang.Object
  |
  +--net.sf.saffron.rel.SaffronRel
        |
        +--net.sf.saffron.rel.SingleRel
              |
              +--net.sf.saffron.rel.SortRel

public class SortRel

extends SingleRel

Relational expression which imposes a particular sort order on its input without otherwise changing its content.

Field Summary

protected RelFieldCollation[]	collations
protected RexNode[]	fieldExps

Fields inherited from class net.sf.saffron.rel.SingleRel

child

Fields inherited from class net.sf.saffron.rel.SaffronRel

cluster, digest, emptyArray, id, nextId, rowType

Constructor Summary

SortRel(VolcanoCluster cluster, SaffronRel child, RelFieldCollation[] collations)
Creates a sorter.

Method Summary

Object	clone()
void	explain(PlanWriter pw)
RexNode[]	getChildExps() Returns an array of this SaffronRel's child expressions (not including the inputs returned by SingleRel.getInputs().
RelFieldCollation[]	getCollations() .

Methods inherited from class net.sf.saffron.rel.SingleRel

childrenAccept, deriveRowType, getInputs, getRows, replaceInput

Methods inherited from class net.sf.saffron.rel.SaffronRel

computeDigest, computeSelfCost, getCluster, getConvention, getCorrelVariable, getId, getInput, getOrCreateCorrelVariable, getQualifier, getQuery, getRelTypeName, getRowType, getTable, getVariablesStopped, implement, implementFieldAccess, isAccessTo, isDistinct, onRegister, recomputeDigest, register, registerCorrelVariable, setCorrelVariable, toString

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

collations

protected final RelFieldCollation[] collations

fieldExps

protected final RexNode[] fieldExps

Constructor Detail

SortRel

public SortRel(VolcanoCluster cluster,
               SaffronRel child,
               RelFieldCollation[] collations)

Creates a sorter.

Parameters:

cluster - VolcanoCluster this relational expression belongs to

child - input relational expression

collations - array of sort specifications

Method Detail

clone

public Object clone()

Specified by:

clone in class SaffronRel

getChildExps

public RexNode[] getChildExps()

Description copied from class: SaffronRel

Returns an array of this SaffronRel's child expressions (not including the inputs returned by SaffronRel.getInputs(). If there are no child expressions, returns an empty array, not null.

Overrides:

getChildExps in class SaffronRel

getCollations

public RelFieldCollation[] getCollations()

.

Returns:

array of RelFieldCollations, from most significant to least significant

explain

public void explain(PlanWriter pw)

Overrides:

explain in class SingleRel