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

Class Quantifier.Existential

java.lang.Object

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

com.apple.foundationdb.record.query.plan.temp.Quantifier.Existential

All Implemented Interfaces:

Bindable

Enclosing class:

Quantifier

public static final class Quantifier.Existential
extends Quantifier

A quantifier that conceptually flows exactly one item containing a boolean to the owning expression indicating whether the subgraph that the quantifier ranges over produced a non-empty or an empty result. When the semantics of this quantifiers are realized in an execution strategy that strategy should facilitate a boolean "short-circuit" mechanism as the result will be true as soon as the subgraph produces the first item.

Nested Class Summary

Nested classes/interfaces inherited from class com.apple.foundationdb.record.query.plan.temp.Quantifier

Quantifier.Existential, Quantifier.ForEach, Quantifier.Physical

Method Summary

Modifier and Type	Method	Description
ExpressionRef<? extends RelationalExpression>	getRangesOver()	Return the reference that the quantifier ranges over.
String	getShorthand()	Return a short hand string for the quantifier.

Methods inherited from class com.apple.foundationdb.record.query.plan.temp.Quantifier

acceptPropertyVisitor, bindTo, equals, existential, forEach, hashCode, physical, physical

Methods inherited from class java.lang.Object

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

Method Detail

getRangesOver

@Nonnull
public ExpressionRef<? extends RelationalExpression> getRangesOver()

Description copied from class: Quantifier

Return the reference that the quantifier ranges over.

Specified by:

getRangesOver in class Quantifier

Returns:

ExpressionRef this quantifier ranges over

getShorthand

@Nonnull
public String getShorthand()

Description copied from class: Quantifier

Return a short hand string for the quantifier. As a quantifier's semantics is usually quite subtle and should not distract from expressions. For example, when a data flow is visualized the returned string should be short.

Specified by:

getShorthand in class Quantifier

Returns:

a short string representing the quantifier.