CREATE OR REPLACE FUNCTION storage.list_objects_with_delimiter(bucket_id text, prefix_param text, delimiter_param text, max_keys integer default 100, start_after text DEFAULT '', next_token text DEFAULT '')
    RETURNS TABLE (name text, id uuid, metadata jsonb, updated_at timestamptz) AS
$$
BEGIN
    RETURN QUERY EXECUTE
        'SELECT DISTINCT ON(name COLLATE "C") * from (
            SELECT
                CASE
                    WHEN position($2 IN substring(name from length($1) + 1)) > 0 THEN
                        substring(name from 1 for length($1) + position($2 IN substring(name from length($1) + 1)))
                    ELSE
                        name
                END AS name, id, metadata, updated_at
            FROM
                storage.objects
            WHERE
                bucket_id = $5 AND
                name ILIKE $1 || ''%'' AND
                CASE
                    WHEN $6 != '''' THEN
                    name COLLATE "C" > $6
                ELSE true END
                AND CASE
                    WHEN $4 != '''' THEN
                        CASE
                            WHEN position($2 IN substring(name from length($1) + 1)) > 0 THEN
                                substring(name from 1 for length($1) + position($2 IN substring(name from length($1) + 1))) COLLATE "C" > $4
                            ELSE
                                name COLLATE "C" > $4
                            END
                    ELSE
                        true
                END
            ORDER BY
                name COLLATE "C" ASC) as e order by name COLLATE "C" LIMIT $3'
        USING prefix_param, delimiter_param, max_keys, next_token, bucket_id, start_after;
END;
$$ LANGUAGE plpgsql;

CREATE INDEX IF NOT EXISTS idx_objects_bucket_id_name
    ON storage.objects (bucket_id, (name COLLATE "C"));