Package com.apple.foundationdb.record.query.plan.temp

Class Compensation.ForMatch

java.lang.Object

com.apple.foundationdb.record.query.plan.temp.Compensation.ForMatch

All Implemented Interfaces:

Compensation, Compensation.WithPredicateCompensation, Function<ExpressionRef<RelationalExpression>,RelationalExpression>

Enclosing interface:

Compensation

public static class Compensation.ForMatch
extends Object
implements Compensation.WithPredicateCompensation

Regular compensation class for matches based on query predicates.

Nested Class Summary

Nested classes/interfaces inherited from interface com.apple.foundationdb.record.query.plan.temp.Compensation

Compensation.ForMatch, Compensation.WithPredicateCompensation

Field Summary

Fields inherited from interface com.apple.foundationdb.record.query.plan.temp.Compensation

IMPOSSIBLE_COMPENSATION, NO_COMPENSATION

Constructor Summary

Constructors

Constructor	Description
ForMatch(Compensation childCompensation, Map<QueryPredicate,QueryPredicate> predicateCompensationMap)

Method Summary

Modifier and Type	Method	Description
RelationalExpression	apply(ExpressionRef<RelationalExpression> reference)	When applied to a reference this method returns a LogicalFilterExpression consuming the reference passed in that applies additional predicates as expressed by the predicate compensation map.
Compensation.WithPredicateCompensation	derivedWithPredicateCompensationMap(Compensation childCompensation, IdentityHashMap<QueryPredicate,QueryPredicate> predicateCompensationMap)	Method to return a new compensation of at least type Compensation.WithPredicateCompensation based on the current compensation object.
Compensation	getChildCompensation()
Map<QueryPredicate,QueryPredicate>	getPredicateCompensationMap()

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.apple.foundationdb.record.query.plan.temp.Compensation

isNeeded

Methods inherited from interface com.apple.foundationdb.record.query.plan.temp.Compensation.WithPredicateCompensation

intersect, union

Methods inherited from interface java.util.function.Function

andThen, compose

Constructor Detail

ForMatch

public ForMatch(@Nonnull
                Compensation childCompensation,
                @Nonnull
                Map<QueryPredicate,QueryPredicate> predicateCompensationMap)

Method Detail

getChildCompensation

@Nonnull
public Compensation getChildCompensation()

Specified by:

getChildCompensation in interface Compensation.WithPredicateCompensation

getPredicateCompensationMap

@Nonnull
public Map<QueryPredicate,QueryPredicate> getPredicateCompensationMap()

Specified by:

getPredicateCompensationMap in interface Compensation.WithPredicateCompensation

derivedWithPredicateCompensationMap

@Nonnull
public Compensation.WithPredicateCompensation derivedWithPredicateCompensationMap(@Nonnull
                                                                                  Compensation childCompensation,
                                                                                  @Nonnull
                                                                                  IdentityHashMap<QueryPredicate,QueryPredicate> predicateCompensationMap)

Description copied from interface: Compensation.WithPredicateCompensation

Method to return a new compensation of at least type Compensation.WithPredicateCompensation based on the current compensation object. This method should be implemented by implementing classes and/or their sub classes. TODO make this method protected in Java 11.

Specified by:

derivedWithPredicateCompensationMap in interface Compensation.WithPredicateCompensation

Parameters:

childCompensation - a compensation that should be applied before the compensation being created in this method

predicateCompensationMap - map that maps QueryPredicates of the query to QueryPredicates used for compensation

Returns:

a new compensation

apply

public RelationalExpression apply(ExpressionRef<RelationalExpression> reference)

When applied to a reference this method returns a LogicalFilterExpression consuming the reference passed in that applies additional predicates as expressed by the predicate compensation map.

Specified by:

apply in interface Function<ExpressionRef<RelationalExpression>,RelationalExpression>

Parameters:

reference - root of graph to apply compensation to

Returns:

a new relational expression that corrects the result of reference by applying an additional filter