spark

Aggregator

case class Aggregator[K, V, C](createCombiner: (V) ⇒ C, mergeValue: (C, V) ⇒ C, mergeCombiners: (C, C) ⇒ C) extends Product with Serializable

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.

Linear Supertypes
Serializable, Serializable, Product, Equals, AnyRef, Any
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Inherited
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  1. Aggregator
  2. Serializable
  3. Serializable
  4. Product
  5. Equals
  6. AnyRef
  7. Any
Visibility
  1. Public
  2. All

Instance Constructors

  1. 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

  1. final def !=(arg0: AnyRef): Boolean

    Definition Classes
    AnyRef
  2. final def !=(arg0: Any): Boolean

    Definition Classes
    Any
  3. final def ##(): Int

    Definition Classes
    AnyRef → Any
  4. final def ==(arg0: AnyRef): Boolean

    Definition Classes
    AnyRef
  5. final def ==(arg0: Any): Boolean

    Definition Classes
    Any
  6. final def asInstanceOf[T0]: T0

    Definition Classes
    Any
  7. def canEqual(arg0: Any): Boolean

    Definition Classes
    Aggregator → Equals
  8. def clone(): AnyRef

    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws()
  9. def combineCombinersByKey(iter: Iterator[(K, C)]): Iterator[(K, C)]

  10. def combineValuesByKey(iter: Iterator[(K, V)]): Iterator[(K, C)]

  11. val createCombiner: (V) ⇒ C

    function to create the initial value of the aggregation.

  12. final def eq(arg0: AnyRef): Boolean

    Definition Classes
    AnyRef
  13. def equals(arg0: Any): Boolean

    Definition Classes
    Aggregator → Equals → AnyRef → Any
  14. def finalize(): Unit

    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws()
  15. final def getClass(): java.lang.Class[_]

    Definition Classes
    AnyRef → Any
  16. def hashCode(): Int

    Definition Classes
    Aggregator → AnyRef → Any
  17. final def isInstanceOf[T0]: Boolean

    Definition Classes
    Any
  18. val mergeCombiners: (C, C) ⇒ C

    function to merge outputs from multiple mergeValue function.

  19. val mergeValue: (C, V) ⇒ C

    function to merge a new value into the aggregation result.

  20. final def ne(arg0: AnyRef): Boolean

    Definition Classes
    AnyRef
  21. final def notify(): Unit

    Definition Classes
    AnyRef
  22. final def notifyAll(): Unit

    Definition Classes
    AnyRef
  23. def productArity: Int

    Definition Classes
    Aggregator → Product
  24. def productElement(arg0: Int): Any

    Definition Classes
    Aggregator → Product
  25. def productIterator: Iterator[Any]

    Definition Classes
    Product
  26. def productPrefix: String

    Definition Classes
    Aggregator → Product
  27. final def synchronized[T0](arg0: ⇒ T0): T0

    Definition Classes
    AnyRef
  28. def toString(): String

    Definition Classes
    Aggregator → AnyRef → Any
  29. final def wait(): Unit

    Definition Classes
    AnyRef
    Annotations
    @throws()
  30. final def wait(arg0: Long, arg1: Int): Unit

    Definition Classes
    AnyRef
    Annotations
    @throws()
  31. final def wait(arg0: Long): Unit

    Definition Classes
    AnyRef
    Annotations
    @throws()

Deprecated Value Members

  1. def productElements: Iterator[Any]

    Definition Classes
    Product
    Annotations
    @deprecated
    Deprecated

    (Since version 2.8.0) use productIterator instead

Inherited from Serializable

Inherited from Serializable

Inherited from Product

Inherited from Equals

Inherited from AnyRef

Inherited from Any