Personally I'd love to drop support for MySQL but we have a few too many organizations that only run MySQL _and_ want to use GitLab. It would be a waste if said

Personally I'd love to drop support for MySQL but we have a few too many organizations that only run MySQL _and_ want to use GitLab. It would be a waste if said organizations wouldn't be able to use GitLab. The approach I tend to go with is to make queries perform as good as possible on PostgreSQL without using too many PostgreSQL specific bits (which would make supporting both DBs more difficult), while making sure they still perform good enough on MySQL.