Example: First
Topic: Aggregations
Code
<?php
declare(strict_types=1);
use function Flow\ETL\DSL\{data_frame, first, from_rows, int_entry, ref, row, rows, to_stream};
require __DIR__ . '/../../../autoload.php';
data_frame()
->from(from_rows(rows(
row(int_entry('a', 100)),
row(int_entry('a', 100)),
row(int_entry('a', 200)),
row(int_entry('a', 400)),
row(int_entry('a', 400))
)))
->aggregate(first(ref('a')))
->write(to_stream(__DIR__ . '/output.txt', truncate: false))
->run();
Output
+---------+
| a_first |
+---------+
| 100 |
+---------+
1 rows
Examples
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