[mysql]equality propagation

equality propagation


MySQL Bugs: #30342: Equality propagation can make optimization much slower
http://bugs.mysql.com/bug.php?id=30342


MySQL 数据库优化（12）Limitations of the MySQL Query Optimizer 道阻且长
https://www.chenyajun.com/2009/01/03/1657
About MySQL development (Optimizer mainly): Optimizer tracing: how to configure it
http://guilhembichot.blogspot.tw/2011/09/optimizer-tracing-how-to-configure-it.html