Spark 4.0.1 ScalaDoc < Back

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package root
Definition Classes
root
package org
Definition Classes
root
package apache
Definition Classes
org
package spark
Core Spark functionality.
Core Spark functionality. org.apache.spark.SparkContext serves as the main entry point to Spark, while org.apache.spark.rdd.RDD is the data type representing a distributed collection, and provides most parallel operations.
In addition, org.apache.spark.rdd.PairRDDFunctions contains operations available only on RDDs of key-value pairs, such as groupByKey and join; org.apache.spark.rdd.DoubleRDDFunctions contains operations available only on RDDs of Doubles; and org.apache.spark.rdd.SequenceFileRDDFunctions contains operations available on RDDs that can be saved as SequenceFiles. These operations are automatically available on any RDD of the right type (e.g. RDD[(Int, Int)] through implicit conversions.
Java programmers should reference the org.apache.spark.api.java package for Spark programming APIs in Java.
Classes and methods marked with Experimental are user-facing features which have not been officially adopted by the Spark project. These are subject to change or removal in minor releases.
Classes and methods marked with Developer API are intended for advanced users want to extend Spark through lower level interfaces. These are subject to changes or removal in minor releases.
Definition Classes
apache
package sql
Allows the execution of relational queries, including those expressed in SQL using Spark.
Allows the execution of relational queries, including those expressed in SQL using Spark.
Definition Classes
spark
package connector
Definition Classes
sql
package catalog
Definition Classes
connector
package functions
Definition Classes
catalog
AggregateFunction
BoundFunction
Function
Reducer
ReducibleFunction
ScalarFunction
UnboundFunction

org.apache.spark.sql.connector.catalog.functions

Reducer

trait Reducer[I, O] extends AnyRef

A 'reducer' for output of user-defined functions.

Annotations

@Evolving()

Source

Reducer.java

Since

4.0.0

See also

ReducibleFunction A user defined function f_source(x) is 'reducible' on another user_defined function f_target(x) if

There exists a reducer function r(x) such that r(f_source(x)) = f_target(x) for all input x, or
More generally, there exists reducer functions r1(x) and r2(x) such that r1(f_source(x)) = r2(f_target(x)) for all input x.

Linear Supertypes

AnyRef, Any

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Abstract Value Members

abstract def reduce(arg: I): O

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Deprecated Value Members

def finalize(): Unit
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protected[lang]
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@throws(classOf[java.lang.Throwable]) @Deprecated
Deprecated
(Since version 9)

Packages

Reducer

trait Reducer[I, O] extends AnyRef

Abstract Value Members

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Reducer

trait Reducer[I, O] extends AnyRef

Abstract Value Members

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Reducer