ydb/yt/yql/tests/sql/suites/optimizers/input_view.txt

$p = @@
def Parse(s):
    return {'subkey': s, 'value': s}
@@;

$pv = Python::Parse(Callable<(String)->Struct<subkey: String, value: String>>, $p);

$i = (
    select
        AsStruct(key as key),
        $pv(info) as info
    from ViewSource
    where info != ""
);

$j = (
    select *
    from $i flatten columns
);

select * from $j