By commit

by_commit.sql

SELECT
  repo_name AS repository,
  EXACT_COUNT_DISTINCT(author.name) AS authors,
  EXACT_COUNT_DISTINCT(committer.name) AS committers,
  COUNT(*) AS commits
FROM
  [bigquery-public-data:github_repos.commits]
WHERE
  committer.date >= TIMESTAMP("2016-01-01 00:00:00")
  AND committer.date < TIMESTAMP("2017-01-01 00:00:00")
GROUP BY
  repository
ORDER BY
  authors DESC
LIMIT
  50

results.csv