Sergey Petrunia is a query optimizer developer at MariaDB. While at MariaDB, he has implemented Table Elimination feature and made improvements to build process. Prior to working at MariaDB, he has been a member of query optimizer team at Sun/MySQL. There he has implemented query optimizer features like index_merge access, partition pruning, semi-join subquery optimizations, and numerous smaller improvements. He maintains a technical blog at http://s.petrunia.net/blog