org.eigenbase.rel
Class OneRowRel

java.lang.Object
  org.eigenbase.rel.AbstractRelNode
      org.eigenbase.rel.OneRowRelBase
          org.eigenbase.rel.OneRowRel

All Implemented Interfaces:

Cloneable, RelNode

public final class OneRowRel
extends OneRowRelBase

OneRowRel always returns one row, one column (containing the value 0).

Since:

23 September, 2001

Version:

$Id: //open/dev/farrago/src/org/eigenbase/rel/OneRowRel.java#13 $

Author:

jhyde

Field Summary

Fields inherited from class org.eigenbase.rel.AbstractRelNode

digest, id, nextId, rowType, traits

Fields inherited from interface org.eigenbase.rel.RelNode

emptyArray

Constructor Summary

OneRowRel(RelOptCluster cluster)
Creates a OneRowRel.

Method Summary

Methods inherited from class org.eigenbase.rel.OneRowRelBase

clone, computeSelfCost, deriveOneRowType, deriveRowType

Methods inherited from class org.eigenbase.rel.AbstractRelNode

childrenAccept, cloneTraits, collectVariablesSet, collectVariablesUsed, computeDigest, explain, 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

Constructor Detail

OneRowRel

public OneRowRel(RelOptCluster cluster)

Creates a OneRowRel.

Parameters:

cluster - RelOptCluster this relational expression belongs to