Ответ

Sumo 24.05.2022 12:50 / 24.05.2022 12:52

#!./parser3
@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]
    $index[^hash::create[]]
    $filter{
       $key[$t.[$col]]
       $b(!^index.contains[$key])
       $index.[$key][]
       $b
    }
    $result[^t.select($filter)]