Turn off eager casting for mysql2, so ActiveRecord can lazily cast values later. This should help performance for tables with complex types like DATETIME, TIMESTAMP

Author: brianmario

activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb

@@ -629,7 +629,7 @@ def connect
         end
 
         def configure_connection
-          @connection.query_options.merge!(:as => :array)
+          @connection.query_options.merge!(:as => :array, :cast => false)
 
           # By default, MySQL 'where id is null' selects the last inserted id.
           # Turn this off. http://dev.rubyonrails.org/ticket/6778