Aggregation Class

public static class Aggregation

Public NotInheritable Class Aggregation

public ref class Aggregation abstract sealed

[<AbstractClassAttribute>]
[<SealedAttribute>]
type Aggregation = class end

Inheritance

Object  →  Aggregation

The factory methods create immutable descriptors. They do not bind to a data frame or execute an aggregation until passed to a descriptor-based Aggregate overload.

Default unary output keys are strings in the form column_statistic. Default binary output keys are strings in the form left_right_statistic. Selector-based methods require the source column-key type to be supplied explicitly because a selector is independent of the key type.

Use Aggregation<C, COut>.As(...) to choose a custom output key type. All descriptors supplied to one descriptor-based Aggregate call must share one output key type, and duplicate output keys are invalid.

The descriptor helper set covers unary and binary aggregator groups that map to one output per selected input or input pair. Dictionary and multi-output aggregators are deferred.

Reference