Leaving MySQL
¯\_(ツ)_/¯ optimizer guy says he did not do good job, shits on optimizer?There're many reasons to pick MySQL over PG at large scale deployments (economics, replication strategies, etc) - and the fact that some queries will run better on PG may not outweight those benefits.Don't get me wrong, I know many areas where MySQL sucks, and that is mostly in lacking execution strategies and optimizer problems. Indeed, in many of these ways MySQL is stuck years behind, but in other areas (MyRocks, modern hardware use, etc) it is far ahead of PG.The thing is, optimizing has costs, and bypassing those costs is useful, if you're looking at economics of your system, and storage engines that pay attention to data patterns are ahead of just naive heaps of data.It is very simple to diss MySQL when your business does not depend on managing petabytes of data.P.S. We've migrated a major social network from PG onto our MySQL-based platform and our MySQL DBAs didn't even notice. :-)