ai.grakn.graql.internal.query.aggregate

Class Aggregates

java.lang.Object

ai.grakn.graql.internal.query.aggregate.Aggregates

public class Aggregates
extends Object

Method Summary

Modifier and Type	Method and Description
static Aggregate<Map<VarName,Concept>,Optional<Double>>	average(VarName varName) Aggregate that finds average (mean) of a match query.
static Aggregate<Object,Long>	count() Aggregate that counts results of a match query.
static Aggregate<Map<VarName,Concept>,Map<Concept,List<Map<VarName,Concept>>>>	group(VarName varName) Aggregate that groups results of a match query by variable name
static <T> Aggregate<Map<VarName,Concept>,Map<Concept,T>>	group(VarName varName, Aggregate<? super Map<VarName,Concept>,T> innerAggregate) Aggregate that groups results of a match query by variable name, applying an aggregate to each group.
static <T> Aggregate<T,List<T>>	list() An aggregate that changes match query results into a list.
static <T extends Comparable<T>> Aggregate<Map<VarName,Concept>,Optional<T>>	max(VarName varName) Aggregate that finds maximum of a match query.
static Aggregate<Map<VarName,Concept>,Optional<Number>>	median(VarName varName) Aggregate that finds median of a match query.
static <T extends Comparable<T>> Aggregate<Map<VarName,Concept>,Optional<T>>	min(VarName varName) Aggregate that finds minimum of a match query.
static <S,T> Aggregate<S,Map<String,T>>	select(com.google.common.collect.ImmutableSet<NamedAggregate<? super S,? extends T>> aggregates) An aggregate that combines several aggregates together into a map (where keys are the names of the aggregates)
static Aggregate<Map<VarName,Concept>,Number>	sum(VarName varName) Aggregate that sums results of a match query.

Methods inherited from class java.lang.Object

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

Method Detail

average

public static Aggregate<Map<VarName,Concept>,Optional<Double>> average(VarName varName)

Aggregate that finds average (mean) of a match query.

count

public static Aggregate<Object,Long> count()

Aggregate that counts results of a match query.

group

public static Aggregate<Map<VarName,Concept>,Map<Concept,List<Map<VarName,Concept>>>> group(VarName varName)

Aggregate that groups results of a match query by variable name

Parameters:

varName - the variable name to group results by

group

public static <T> Aggregate<Map<VarName,Concept>,Map<Concept,T>> group(VarName varName,
                                                                       Aggregate<? super Map<VarName,Concept>,T> innerAggregate)

Aggregate that groups results of a match query by variable name, applying an aggregate to each group.

Type Parameters:

T - the type of each group

list

public static <T> Aggregate<T,List<T>> list()

An aggregate that changes match query results into a list.

Type Parameters:

T - the type of the results of the match query

max

public static <T extends Comparable<T>> Aggregate<Map<VarName,Concept>,Optional<T>> max(VarName varName)

Aggregate that finds maximum of a match query.

median

public static Aggregate<Map<VarName,Concept>,Optional<Number>> median(VarName varName)

Aggregate that finds median of a match query.

min

public static <T extends Comparable<T>> Aggregate<Map<VarName,Concept>,Optional<T>> min(VarName varName)

Aggregate that finds minimum of a match query.

select

public static <S,T> Aggregate<S,Map<String,T>> select(com.google.common.collect.ImmutableSet<NamedAggregate<? super S,? extends T>> aggregates)

An aggregate that combines several aggregates together into a map (where keys are the names of the aggregates)

Type Parameters:

S - the type of the match query results

T - the type of the aggregate results

sum

public static Aggregate<Map<VarName,Concept>,Number> sum(VarName varName)

Aggregate that sums results of a match query.