Examples

Columns

Description

withColumn() adds a column, or replaces one with the same name. The value is any expression: computed from other columns (ref('id')->isOdd()) or a constant (lit(5)).

Documentation

Column operations rewrite the schema, and the rows follow it.

Rename
Select and Drop
Data Manipulation

Code

<?php

declare(strict_types=1);

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

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

data_frame()
    ->read(from_array([
        ['id' => 1, 'name' => 'Norbert'],
        ['id' => 2, 'name' => 'John'],
        ['id' => 3, 'name' => 'Jane'],
    ]))
    ->withColumn('active', ref('id')->isOdd())
    ->withColumn('number', lit(5))
    ->collect()
    ->write(to_output(truncate: false))
    ->run();

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