org.eigenbase.oj.rel
Class IterConcatenateRel

java.lang.Object
  org.eigenbase.rel.AbstractRelNode
      org.eigenbase.rel.SetOpRel
          org.eigenbase.rel.UnionRelBase
              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

emptyArray

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

IterConcatenateRel

public IterConcatenateRel(RelOptCluster cluster,
                          RelNode[] inputs)

Method Detail

clone

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(...);
         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

clone

public IterConcatenateRel clone(RelNode[] inputs,
                                boolean all)

Specified by:

clone in class SetOpRel

computeSelfCost

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

Overrides:

computeSelfCost in class AbstractRelNode

getCompoundIteratorClass

protected OJClass getCompoundIteratorClass()

implement

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

Parameters:

implementor - implementor