Class VolcanoPlannerTest.TestLeafRel

  extended by org.eigenbase.rel.AbstractRelNode
      extended by org.eigenbase.relopt.volcano.VolcanoPlannerTest.TestLeafRel
All Implemented Interfaces:
Cloneable, RelNode
Direct Known Subclasses:
VolcanoPlannerTest.NoneLeafRel, VolcanoPlannerTest.PhysLeafRel
Enclosing class:

private abstract static class VolcanoPlannerTest.TestLeafRel
extends AbstractRelNode

Field Summary
private  String label
Fields inherited from class org.eigenbase.rel.AbstractRelNode
digest, id, rowType, traits
Fields inherited from interface org.eigenbase.rel.RelNode
Constructor Summary
protected VolcanoPlannerTest.TestLeafRel(RelOptCluster cluster, RelTraitSet traits, String label)
Method Summary
 VolcanoPlannerTest.TestLeafRel clone()
          Clones this RelNode.
 RelOptCost computeSelfCost(RelOptPlanner planner)
          Returns the cost of this plan (not including children).
protected  RelDataType deriveRowType()
 void explain(RelOptPlanWriter pw)
 String getLabel()
Methods inherited from class org.eigenbase.rel.AbstractRelNode
childrenAccept, cloneTraits, collectVariablesSet, collectVariablesUsed, computeDigest, getChildExps, getCluster, getCollationList, getConvention, getCorrelVariable, getDescription, getDigest, getExpectedInputRowType, getId, getInput, getInputs, getOrCreateCorrelVariable, getQuery, getRelTypeName, getRows, getRowType, getTable, getTraits, getVariablesStopped, inheritTraitsFrom, isAccessTo, isDistinct, isValid, onRegister, recomputeDigest, register, registerCorrelVariable, replaceInput, setCorrelVariable, toString
Methods inherited from class java.lang.Object
equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail


private String label
Constructor Detail


protected VolcanoPlannerTest.TestLeafRel(RelOptCluster cluster,
                                         RelTraitSet traits,
                                         String label)
Method Detail


public String getLabel()


public VolcanoPlannerTest.TestLeafRel 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 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
computeSelfCost in class AbstractRelNode


protected RelDataType deriveRowType()
deriveRowType in class AbstractRelNode


public void explain(RelOptPlanWriter pw)
Specified by:
explain in interface RelNode
explain in class AbstractRelNode