Its both. Some of the optimizations are rule based and some are cost based.
John From: Ashok Kumar <[email protected]<mailto:[email protected]>> Reply-To: "[email protected]<mailto:[email protected]>" <[email protected]<mailto:[email protected]>>, Ashok Kumar <[email protected]<mailto:[email protected]>> Date: Wednesday, February 3, 2016 at 11:45 AM To: User <[email protected]<mailto:[email protected]>> Subject: Hive optimizer Hi, Is Hive optimizer a cost based Optimizer (CBO) or a rule based optimizer (CBO) or none of them. thanks
