tickscript.selectWindow() function

tickscript.selectWindow() changes a column’s name, windows rows by time, and then applies an aggregate or selector function the specified column for each window of time.

TICKscript helper function

tickscript.selectWindow is a helper function meant to replicate TICKscript operations like the following:

// Rename, window, and aggregate
query("SELECT f(x) AS y")
  .groupBy(time(t), ...)

Function type signature

(
    <-tables: stream[D],
    as: string,
    defaultValue: A,
    every: duration,
    fn: (<-: stream[B], column: string) => stream[C],
    ?column: string,
) => stream[E] where B: Record, C: Record, D: Record, E: Record

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Parameters

column

Column to operate on. Default is _value.

fn

({{< req >}}) Aggregate or selector function to apply.

as

({{< req >}}) New column name.

every

({{< req >}}) Duration of windows.

defaultValue

({{< req >}}) Default fill value for null values in column. Must be the same data type as column.

tables

Input data. Default is piped-forward data (<-).

Examples

Change the name of, window, and then aggregate the value column

import "contrib/bonitoo-io/tickscript"

data
    |> tickscript.selectWindow(fn: sum, as: "example-name", every: 1h, defaultValue: 0)

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Input data

Output data

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