case class Aggregator[K, V, C](createCombiner: (V) => C, mergeValue: (C, V) => C, mergeCombiners: (C, C) => C) extends Product with Serializable
:: DeveloperApi :: A set of functions used to aggregate data.
- createCombiner
function to create the initial value of the aggregation.
- mergeValue
function to merge a new value into the aggregation result.
- mergeCombiners
function to merge outputs from multiple mergeValue function.
- Annotations
- @DeveloperApi()
- Source
- Aggregator.scala
Linear Supertypes
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Inherited
- Aggregator
- Serializable
- Product
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Instance Constructors
- new Aggregator(createCombiner: (V) => C, mergeValue: (C, V) => C, mergeCombiners: (C, C) => C)
- createCombiner
function to create the initial value of the aggregation.
- mergeValue
function to merge a new value into the aggregation result.
- mergeCombiners
function to merge outputs from multiple mergeValue function.
Value Members
- final def !=(arg0: Any): Boolean
- Definition Classes
- AnyRef → Any
- final def ##: Int
- Definition Classes
- AnyRef → Any
- final def ==(arg0: Any): Boolean
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- final def asInstanceOf[T0]: T0
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- def clone(): AnyRef
- Attributes
- protected[lang]
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- Annotations
- @throws(classOf[java.lang.CloneNotSupportedException]) @IntrinsicCandidate() @native()
- def combineCombinersByKey(iter: Iterator[_ <: Product2[K, C]], context: TaskContext): Iterator[(K, C)]
- def combineValuesByKey(iter: Iterator[_ <: Product2[K, V]], context: TaskContext): Iterator[(K, C)]
- val createCombiner: (V) => C
- final def eq(arg0: AnyRef): Boolean
- Definition Classes
- AnyRef
- final def getClass(): Class[_ <: AnyRef]
- Definition Classes
- AnyRef → Any
- Annotations
- @IntrinsicCandidate() @native()
- final def isInstanceOf[T0]: Boolean
- Definition Classes
- Any
- val mergeCombiners: (C, C) => C
- val mergeValue: (C, V) => C
- final def ne(arg0: AnyRef): Boolean
- Definition Classes
- AnyRef
- final def notify(): Unit
- Definition Classes
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- Annotations
- @IntrinsicCandidate() @native()
- final def notifyAll(): Unit
- Definition Classes
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- Annotations
- @IntrinsicCandidate() @native()
- def productElementNames: Iterator[String]
- Definition Classes
- Product
- final def synchronized[T0](arg0: => T0): T0
- Definition Classes
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- final def wait(arg0: Long, arg1: Int): Unit
- Definition Classes
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- Annotations
- @throws(classOf[java.lang.InterruptedException])
- final def wait(arg0: Long): Unit
- Definition Classes
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- Annotations
- @throws(classOf[java.lang.InterruptedException]) @native()
- final def wait(): Unit
- Definition Classes
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- Annotations
- @throws(classOf[java.lang.InterruptedException])
Deprecated Value Members
- def finalize(): Unit
- Attributes
- protected[lang]
- Definition Classes
- AnyRef
- Annotations
- @throws(classOf[java.lang.Throwable]) @Deprecated
- Deprecated
(Since version 9)