org.eigenbase.rel
Class UnionRel

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

All Implemented Interfaces:

Cloneable, RelNode

public final class UnionRel
extends UnionRelBase

UnionRel returns the union of the rows of its inputs, optionally eliminating duplicates.

Since:

23 September, 2001

Version:

$Id: //open/dev/farrago/src/org/eigenbase/rel/UnionRel.java#12 $

Author:

jhyde

Field Summary

Fields inherited from class org.eigenbase.rel.SetOpRel

all, inputs

Fields inherited from class org.eigenbase.rel.AbstractRelNode

digest, id, nextId, rowType, traits

Fields inherited from interface org.eigenbase.rel.RelNode

emptyArray

Constructor Summary

UnionRel(RelOptCluster cluster, RelNode[] inputs, boolean all)

Method Summary

UnionRel	clone() Clones this RelNode.
UnionRel	clone(RelNode[] inputs, boolean all)

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, computeSelfCost, 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

Constructor Detail

UnionRel

public UnionRel(RelOptCluster cluster,
                RelNode[] inputs,
                boolean all)

Method Detail

clone

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

Specified by:

clone in class SetOpRel