PartialAggregation

Matches a logical aggregation that can be performed on distributed data in two steps. The first operates on the data in each partition performing partial aggregation for each group. The second occurs after the shuffle and completes the aggregation.

This pattern will only match if all aggregate expressions can be computed partially and will return the rewritten aggregation expressions for both phases.

The returned values for this match are as follows:

Grouping attributes for the final aggregation.
Aggregates for the final aggregation.
Grouping expressions for the partial aggregation.
Partial aggregate expressions.
Input to the aggregation.

Linear Supertypes

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Type Members

type ReturnType = (Seq[Attribute], Seq[NamedExpression], Seq[Expression], Seq[NamedExpression], LogicalPlan)

Value Members

final def !=(arg0: Any): Boolean

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final def ##(): Int

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final def ==(arg0: Any): Boolean

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final def asInstanceOf[T0]: T0

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def clone(): AnyRef

Attributes
protected[java.lang]
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Annotations
@throws( ... )
final def eq(arg0: AnyRef): Boolean

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def equals(arg0: Any): Boolean

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def finalize(): Unit

Attributes
protected[java.lang]
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@throws( classOf[java.lang.Throwable] )
final def getClass(): Class[_]

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def hashCode(): Int

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final def isInstanceOf[T0]: Boolean

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final def ne(arg0: AnyRef): Boolean

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final def notify(): Unit

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final def notifyAll(): Unit

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final def synchronized[T0](arg0: ⇒ T0): T0

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def toString(): String

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def unapply(plan: LogicalPlan): Option[ReturnType]
final def wait(): Unit

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@throws( ... )
final def wait(arg0: Long, arg1: Int): Unit

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final def wait(arg0: Long): Unit

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Related Doc: package planning

object PartialAggregation

Type Members

type ReturnType = (Seq[Attribute], Seq[NamedExpression], Seq[Expression], Seq[NamedExpression], LogicalPlan)

Value Members

final def !=(arg0: Any): Boolean

final def ##(): Int

final def ==(arg0: Any): Boolean

final def asInstanceOf[T0]: T0

def clone(): AnyRef

final def eq(arg0: AnyRef): Boolean

def equals(arg0: Any): Boolean

def finalize(): Unit

final def getClass(): Class[_]

def hashCode(): Int

final def isInstanceOf[T0]: Boolean

final def ne(arg0: AnyRef): Boolean

final def notify(): Unit

final def notifyAll(): Unit

final def synchronized[T0](arg0: ⇒ T0): T0

def toString(): String

def unapply(plan: LogicalPlan): Option[ReturnType]

final def wait(): Unit

final def wait(arg0: Long, arg1: Int): Unit

final def wait(arg0: Long): Unit

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