Examples

Partitioning

Description

Read partitioned data after writing with overwrite mode. Each partition contains exactly one file with the latest data.

Documentation

Partitioning is declared on the loader, and lets a reader skip whole directories.

Partitioning
Save Mode

Code

<?php

declare(strict_types=1);

use function Flow\ETL\Adapter\CSV\{from_csv, to_csv};
use function Flow\ETL\DSL\{data_frame, from_array, overwrite, partition_by, ref, to_output};

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

$outputPath = __DIR__ . '/output';

data_frame()
    ->read(from_array(
        [
            ['id' => 1, 'color' => 'red', 'name' => 'Widget'],
            ['id' => 2, 'color' => 'blue', 'name' => 'Gadget'],
        ]
    ))
    ->write(to_csv($outputPath . '/products.csv')->saveMode(overwrite())->partitionBy(partition_by(ref('color'))))
    ->run();

data_frame()
    ->read(from_csv($outputPath . '/color=*/*.csv'))
    ->write(to_output(truncate: false))
    ->run();

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