2019
Kevac - Bitmap indexes
    https://habr.com/ru/company/badoo/blog/451938/
    https://www.youtube.com/watch?v=WvlUH6MjUuI
    https://github.com/mkevac/gopherconrussia2019
    https://github.com/mkevac/gopherconrussia2019/blob/master/GopherconRussia2019.pdf