Example: Max
Topic: Aggregations
Code
<?php
declare(strict_types=1);
use function Flow\ETL\DSL\{data_frame, from_rows, int_entry, max, 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(max(ref('a')))
->write(to_stream(__DIR__ . '/output.txt', truncate: false))
->run();
Output
+-------+
| a_max |
+-------+
| 400 |
+-------+
1 rows
Examples
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