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$src = [
    <|key: 1, subkey:2, value:3|>,
    <|key: 1, subkey:3, value:1|>,
    <|key: 1, subkey:1, value:2|>,
    <|key: 2, subkey:20, value:30|>,
    <|key: 2, subkey:30, value:10|>,
    <|key: 2, subkey:10, value:20|>,
];

SELECT
   key, subkey,
   row_number() over (partition by key order by subkey) as row,
   value
FROM (
SELECT
    key as key,
    subkey,
    row_number() over (partition by key order by subkey desc) as row,
    min(value) over (partition by key) as minvalue,
    value
FROM as_table($src)
)