org.eigenbase.sarg
Class SargSetExpr

java.lang.Object
  org.eigenbase.sarg.SargSetExpr

All Implemented Interfaces:

SargExpr

public class SargSetExpr
extends Object
implements SargExpr

SargSetExpr represents the application of a set operator to zero or more child sarg expressions.

Version:

$Id: //open/dev/farrago/src/org/eigenbase/sarg/SargSetExpr.java#14 $

Author:

John V. Sichi

Nested Class Summary

private static class

SargSetExpr.IntervalComparator Comparator used in evaluateUnionOp.

Field Summary

private List<SargExpr>	children
private RelDataType	dataType
private SargFactory	factory
private SargSetOperator	setOp

Constructor Summary

SargSetExpr(SargFactory factory, RelDataType dataType, SargSetOperator setOp)

Method Summary

void	addChild(SargExpr child) Adds a child to this expression.
void	collectDynamicParams(Set<RexDynamicParam> dynamicParams) Collects all dynamic parameters referenced by this expression.
SargIntervalSequence	evaluate() Resolves this expression into a fixed SargIntervalSequence.
private List<SargIntervalSequence>	evaluateChildren(SargSetExpr setExpr)
SargIntervalSequence	evaluateComplemented() Resolves the complement of this expression into a fixed SargIntervalSequence.
private SargIntervalSequence	evaluateIntersection(List<SargIntervalSequence> list)
private SargIntervalSequence	evaluateUnion(List<SargIntervalSequence> list)
List<SargExpr>	getChildren()
RelDataType	getDataType()
SargFactory	getFactory()
private void	intersectSequences(SargIntervalSequence targetSeq, SargIntervalSequence sourceSeq)
String	toString() Overrides the default Object.toString.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

factory

private final SargFactory factory

dataType

private final RelDataType dataType

setOp

private final SargSetOperator setOp

children

private final List<SargExpr> children

Constructor Detail

SargSetExpr

SargSetExpr(SargFactory factory,
            RelDataType dataType,
            SargSetOperator setOp)

See Also:

SargFactory.newSetExpr(org.eigenbase.reltype.RelDataType, org.eigenbase.sarg.SargSetOperator)

Method Detail

getChildren

public List<SargExpr> getChildren()

Returns:

a read-only list of this expression's children (the returned children themselves are modifiable)

addChild

public void addChild(SargExpr child)

Adds a child to this expression.

Parameters:

child - child to add

getFactory

public SargFactory getFactory()

Specified by:

getFactory in interface SargExpr

Returns:

the factory which produced this expression

getDataType

public RelDataType getDataType()

Specified by:

getDataType in interface SargExpr

Returns:

datatype for coordinates of search domain

toString

public String toString()

Description copied from interface: SargExpr

Overrides the default Object.toString. The result must be safe for use in a RelNode digest.

Specified by:

toString in interface SargExpr

Overrides:

toString in class Object

evaluate

public SargIntervalSequence evaluate()

Description copied from interface: SargExpr

Resolves this expression into a fixed SargIntervalSequence.

TODO jvs 17-Jan-2006: add binding for dynamic params so they can be evaluated as well

Specified by:

evaluate in interface SargExpr

Returns:

immutable ordered sequence of disjoint intervals

evaluateChildren

private List<SargIntervalSequence> evaluateChildren(SargSetExpr setExpr)

collectDynamicParams

public void collectDynamicParams(Set<RexDynamicParam> dynamicParams)

Description copied from interface: SargExpr

Collects all dynamic parameters referenced by this expression.

Specified by:

collectDynamicParams in interface SargExpr

Parameters:

dynamicParams - receives dynamic parameter references

evaluateUnion

private SargIntervalSequence evaluateUnion(List<SargIntervalSequence> list)

evaluateIntersection

private SargIntervalSequence evaluateIntersection(List<SargIntervalSequence> list)

intersectSequences

private void intersectSequences(SargIntervalSequence targetSeq,
                                SargIntervalSequence sourceSeq)

evaluateComplemented

public SargIntervalSequence evaluateComplemented()

Description copied from interface: SargExpr

Resolves the complement of this expression into a fixed SargIntervalSequence.

Specified by:

evaluateComplemented in interface SargExpr

Returns:

immutable ordered sequence of disjoint intervals