Dear all,

  Hello,Recently I am intersting in query optimize, and have know that most database's query optimizing methods contain two £º1. Rule Base Optimizer;  2.Cost Base Optimizer. I also know that MonetDB has two-level optimizing ,one is relation algebra optimize and the other is MAL optimize when interprets a sql.

I understand relation algebra optimize is no relationship with the column-oriented special query optimize.MAL optimizer may be some relationship with the column-oriented special query optimize. So I want to ask :MAL optimize is also contain Rule Base Optimizer and Cost Base Optimizer? which optimizers is the special query optimizer for the column-oriented and not for tuple-oriented database?

Best regards!