org.eigenbase.rel
Class ValuesRelBase

java.lang.Object
  org.eigenbase.rel.AbstractRelNode
      org.eigenbase.rel.ValuesRelBase

All Implemented Interfaces:

Cloneable, RelNode

Direct Known Subclasses:

FennelValuesRel, ValuesRel

public abstract class ValuesRelBase
extends AbstractRelNode

ValuesRelBase is an abstract base class for implementations of ValuesRel.

Version:

$Id: //open/dev/farrago/src/org/eigenbase/rel/ValuesRelBase.java#11 $

Author:

John V. Sichi

Field Summary

protected List<List<RexLiteral>>

tuples

Fields inherited from class org.eigenbase.rel.AbstractRelNode

digest, id, nextId, rowType, traits

Fields inherited from interface org.eigenbase.rel.RelNode

emptyArray

Constructor Summary

protected

ValuesRelBase(RelOptCluster cluster, RelDataType rowType, List<List<RexLiteral>> tuples, RelTraitSet traits) Creates a new ValuesRelBase.

Method Summary

private boolean	assertRowType()
ValuesRelBase	clone() Clones this RelNode.
RelOptCost	computeSelfCost(RelOptPlanner planner) Returns the cost of this plan (not including children).
protected RelDataType	deriveRowType()
void	explain(RelOptPlanWriter pw)
double	getRows() Returns an estimate of the number of rows this relational expression will return.
List<List<RexLiteral>>	getTuples()

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, 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

tuples

protected final List<List<RexLiteral>> tuples

Constructor Detail

ValuesRelBase

protected ValuesRelBase(RelOptCluster cluster,
                        RelDataType rowType,
                        List<List<RexLiteral>> tuples,
                        RelTraitSet traits)

Creates a new ValuesRelBase. Note that tuples passed in become owned by this rel (without a deep copy), so caller must not modify them after this call, otherwise bad things will happen.

Parameters:

cluster - .

rowType - row type for tuples produced by this rel

tuples - 2-dimensional array of tuple values to be produced; outer list contains tuples; each inner list is one tuple; all tuples must be of same length, conforming to rowType

Method Detail

getTuples

public List<List<RexLiteral>> getTuples()

Returns:

rows of literals represented by this rel

assertRowType

private boolean assertRowType()

Returns:

true if all tuples match rowType; otherwise, assert on mismatch

clone

public ValuesRelBase 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

deriveRowType

protected RelDataType deriveRowType()

Overrides:

deriveRowType in class AbstractRelNode

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

getRows

public double getRows()

Description copied from interface: RelNode

Returns an estimate of the number of rows this relational expression will return.

NOTE jvs 29-Mar-2006: Don't call this method directly. Instead, use RelMetadataQuery.getRowCount(org.eigenbase.rel.RelNode), which gives plugins a chance to override the rel's default ideas about row count.

Specified by:

getRows in interface RelNode

Overrides:

getRows in class AbstractRelNode

explain

public void explain(RelOptPlanWriter pw)

Specified by:

explain in interface RelNode

Overrides:

explain in class AbstractRelNode