Вариант

Maxx 21.05.2022 14:56

@main[]
$t[^table::create{id	name	surname
20856	Alex	Ivanov
10458	Sergey	Petrov
20856	Alex	Ivanov
}]

^json:string[^uniq_table[$t;id]]


@uniq_table[t;col][locals]
$result[^table::create[$t;$.limit(0)]]
$h[^t.hash[$col][$.distinct(1)]]
^h.foreach[_;row]{^result.append[$row.fields]}