Examples

Transformations

Description

sortBy() orders the whole frame, so it has to see every row first. ->desc() reverses the order.

Documentation

Transformations are expressions over a row, evaluated column by column.

Transformations
Sort

Code

<?php

declare(strict_types=1);

use function Flow\ETL\DSL\{data_frame, from_sequence_number, ref, to_output};

require __DIR__ . '/vendor/autoload.php';

data_frame()
    ->read(from_sequence_number('id', 0, 10))
    ->sortBy([ref('id')->desc()])
    ->collect()
    ->write(to_output(truncate: false))
    ->run();

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