SELECT
    cast(pow(10, floor(log10(c))) as int) AS stars,
    count(distinct k)
FROM
(
    SELECT
        cast(repo["name"] as string) as k,
        count() AS c
    FROM github_events
    WHERE type = 'WatchEvent'
    GROUP BY cast(repo["name"] as string)
) t
GROUP BY stars
ORDER BY stars ASC