agg

package module

v0.0.0-...-5d96a63 Latest Latest Go to latest Published: Jul 1, 2022 License: MIT Imports: 3 Imported by: 0

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Algorithms based on "Optimal aggregation algorithms for middleware" by Fagin R, Lotem A, Naor M.

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type Aggregator func([]float64) float64

type Datum interface {
	ID() interface{}
	Fields() []float64
}

func NRA(fetcher Fetcher, agg Aggregator, k int, opts ...Option) ([]Datum, error)

type Fetcher interface {
	// descending order
	ScanFields() []Iterator
	GetDatum(*Datum) error

	Merge(dst *Datum, src Datum)
}

type Iterator interface {
	Next(count int) ([]Datum, error)
	ValueRange() (min, max, missing float64)
}

type Option func(*options)

func WithBatchSize(k int) Option