Examples

Partitioning

Description

Skip entire partitions without reading their data using filterPartitions(). Unlike filter() which reads all data then filters, partition pruning evaluates metadata first and only reads matching partitions - dramatically improving performance for large datasets.

Documentation

Partitioning

Code

<?php

declare(strict_types=1);

use function Flow\ETL\Adapter\CSV\from_csv;
use function Flow\ETL\DSL\{data_frame, lit, ref, to_output};

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

data_frame()
    ->read(from_csv(__DIR__ . '/input/color=*/sku=*/*.csv'))
    ->filterPartitions(ref('color')->notEquals(lit('green')))
    ->collect()
    ->write(to_output(truncate: false))
    ->run();

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