Flow PHP

KeyGrouping

Read onlyYes

FinalYes

Collects rows sharing a key into one batch, so a downstream operator sees each key exactly once and contiguously. The normalized hash is the key: no tuple, and `1`, `1.0` and `"1"` land together.

Methods

__construct() : mixed
group() : Generator<string|int, Rows>

__construct()


    public
                    __construct(KeyValues $keys, Hasher $hasher) : mixed

Parameters

$keys : KeyValues
$hasher : Hasher

group()


    public
                    group(Generator<string|int, Rows> $rows) : Generator<string|int, Rows>

Parameters

$rows : Generator<string|int, Rows>

Return values

Generator<string|int, Rows>