Class IterConcatenateRel

  extended by org.eigenbase.rel.AbstractRelNode
      extended by org.eigenbase.rel.SetOpRel
          extended by org.eigenbase.rel.UnionRelBase
              extended by org.eigenbase.oj.rel.IterConcatenateRel
All Implemented Interfaces:
Cloneable, JavaRel, RelNode

public class IterConcatenateRel
extends UnionRelBase
implements JavaRel

IterConcatenateRel concatenates several iterators. It is an iterator implementation of UnionRel.

Field Summary
Fields inherited from class org.eigenbase.rel.SetOpRel
all, inputs
Fields inherited from class org.eigenbase.rel.AbstractRelNode
digest, id, rowType, traits
Fields inherited from interface org.eigenbase.rel.RelNode
Constructor Summary
IterConcatenateRel(RelOptCluster cluster, RelNode[] inputs)
Method Summary
 IterConcatenateRel clone()
          Clones this RelNode.
 IterConcatenateRel clone(RelNode[] inputs, boolean all)
 RelOptCost computeSelfCost(RelOptPlanner planner)
          Returns the cost of this plan (not including children).
protected  OJClass getCompoundIteratorClass()
 ParseTree implement(JavaRelImplementor implementor)
          Creates a plan for this expression according to a calling convention.
Methods inherited from class org.eigenbase.rel.UnionRelBase
estimateRowCount, getRows
Methods inherited from class org.eigenbase.rel.SetOpRel
deriveRowType, explain, getInputs, isDistinct, isHomogeneous, isHomogeneous, 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, 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, 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

Constructor Detail


public IterConcatenateRel(RelOptCluster cluster,
                          RelNode[] inputs)
Method Detail


public IterConcatenateRel 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 IterConcatenateRel clone(RelNode[] inputs,
                                boolean all)
Specified by:
clone in class SetOpRel


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 OJClass getCompoundIteratorClass()


public ParseTree implement(JavaRelImplementor implementor)
Description copied from interface: JavaRel
Creates a plan for this expression according to a calling convention.

Specified by:
implement in interface JavaRel
implementor - implementor