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
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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
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- 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
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- val mergeCombiners: (C, C) ⇒ C
- val mergeValue: (C, V) ⇒ C
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