Documentation

experimental.diff() function

experimental.diff() is subject to change at any time. By using this function, you accept the risks of experimental functions.

experimental.diff() takes two table streams as input and produces a diff.

experimental.diff() compares tables with the same group key. If compared tables are different, the function returns a table for that group key with one or more rows. If there are no differences, the function does not return a table for that group key.

Note: experimental.diff() cannot tell the difference between an empty table and a non-existent table.

Important: The output format of the diff is not considered stable and the algorithm used to produce the diff may change. The only guarantees are those mentioned above.

Function type signature
(<-got: stream[A], want: stream[A]) => stream[{A with _diff: string}]
For more information, see Function type signatures.

Parameters

want

(Required) Input stream for the - side of the diff.

got

Input stream for the + side of the diff.

Examples

Output a diff between two streams of tables

import "sampledata"
import "experimental"

want = sampledata.int()
got =
    sampledata.int()
        |> map(fn: (r) => ({r with _value: if r._value > 15 then r._value + 1 else r._value}))

experimental.diff(got: got, want: want)

View example input

Return a diff between a stream of tables and the expected output

import "experimental"

want = from(bucket: "backup-example-bucket") |> range(start: -5m)

from(bucket: "example-bucket")
    |> range(start: -5m)
    |> experimental.diff(want: want)

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