io.github.dengliming.redismodule.redisearch.aggregate

类 Reducers

java.lang.Object

io.github.dengliming.redismodule.redisearch.aggregate.Reducers

public final class Reducers
extends Object

作者:

dengliming

构造器概要

构造器

构造器和说明
Reducers()

方法概要

限定符和类型	方法和说明
static Reducer	avg(String field) Return the average value of a numeric property.
static Reducer	count() Count the number of records in each group
static Reducer	countDistinct(String field) Count the number of distinct values for property
static Reducer	countDistinctish(String field) Same as COUNT_DISTINCT - but provide an approximation instead of an exact count
static Reducer	firstValue(String field) Return the first or top value of a given property in the group.
static Reducer	firstValue(String field, String by)
static Reducer	firstValue(String field, String by, org.redisson.api.SortOrder order)
static Reducer	max(String field) Return the maximal value of a property, whether it is a string, number or NULL
static Reducer	min(String field) Return the minimal value of a property, whether it is a string, number or NULL.
static Reducer	quantile(String field, double quantile) Return the value of a numeric property at a given quantile of the results.
static Reducer	randomSample(String field, int sampleSize) Perform a reservoir sampling of the group elements with a given size, and return an array of the sampled items with an even distribution.
static Reducer	stdDev(String field) Return the standard deviation of a numeric property in the group.
static Reducer	sum(String field) Return the sum of all numeric values of a given property in a group.
static Reducer	toList(String field) Merge all distinct values of a given property into a single array.

从类继承的方法 java.lang.Object

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

构造器详细资料

Reducers

public Reducers()

方法详细资料

max

public static Reducer max(String field)

Return the maximal value of a property, whether it is a string, number or NULL

参数:

field -

返回:

avg

public static Reducer avg(String field)

Return the average value of a numeric property.

参数:

field -

返回:

count

public static Reducer count()

Count the number of records in each group

返回:

countDistinct

public static Reducer countDistinct(String field)

Count the number of distinct values for property

参数:

field -

返回:

countDistinctish

public static Reducer countDistinctish(String field)

Same as COUNT_DISTINCT - but provide an approximation instead of an exact count

参数:

field -

返回:

sum

public static Reducer sum(String field)

Return the sum of all numeric values of a given property in a group.

参数:

field -

返回:

min

public static Reducer min(String field)

Return the minimal value of a property, whether it is a string, number or NULL.

参数:

field -

返回:

stdDev

public static Reducer stdDev(String field)

Return the standard deviation of a numeric property in the group.

参数:

field -

返回:

quantile

public static Reducer quantile(String field,
                               double quantile)

Return the value of a numeric property at a given quantile of the results.

参数:

field -

quantile -

返回:

toList

public static Reducer toList(String field)

Merge all distinct values of a given property into a single array.

参数:

field -

返回:

firstValue

public static Reducer firstValue(String field)

Return the first or top value of a given property in the group.

参数:

field -

返回:

firstValue

public static Reducer firstValue(String field,
                                 String by)

参数:

field -

by - If no BY is specified, we return the first value we encounter in the group

返回:

firstValue

public static Reducer firstValue(String field,
                                 String by,
                                 org.redisson.api.SortOrder order)

randomSample

public static Reducer randomSample(String field,
                                   int sampleSize)

Perform a reservoir sampling of the group elements with a given size, and return an array of the sampled items with an even distribution.

参数:

field -

sampleSize -

返回: