update ActiveRecord benchmark to include lazy date/time casting

benchmark/active_record.rb

@@ -22,13 +22,83 @@ class Mysql2Model < ActiveRecord::Base
   set_table_name :mysql2_test
 end
 
+class Mysql2Model2 < ActiveRecord::Base
+  set_table_name :mysql2_test
+end
+
 class MysqlModel < ActiveRecord::Base
   set_table_name :mysql2_test
 end
 
+Mysql2Model.establish_connection(mysql2_opts)
+
+Mysql2Model2.establish_connection(mysql2_opts)
+connection = Mysql2Model2.connection.instance_variable_get "@connection"
+connection.query_options[:cast_dates]        = false
+connection.query_options[:cast_datetimes]    = false
+
+Benchmark.bmbm do |x|
+  x.report "Mysql2 (with auto casting, no attr access)" do
+    number_of.times do
+      Mysql2Model.all(:limit => 1000)
+    end
+  end
+
+  x.report "Mysql2 (with lazy casting, no attr access)" do
+    number_of.times do
+      Mysql2Model2.all(:limit => 1000)
+    end
+  end
+
+  x.report "Mysql (with lazy casting, no attr access)" do
+    MysqlModel.establish_connection(mysql_opts)
+    number_of.times do
+      MysqlModel.all(:limit => 1000)
+    end
+  end
+end
+
+GC.start
+puts
+puts
+Benchmark.bmbm do |x|
+  x.report "Mysql2 (with auto casting, read date/datetime/timestamp attrs)" do
+    number_of.times do
+      Mysql2Model.all(:limit => 1000).each{ |r|
+        r.date_test
+        r.date_time_test
+        r.timestamp_test
+      }
+    end
+  end
+
+  x.report "Mysql2 (with lazy casting, read date/datetime/timestamp attrs)" do
+    number_of.times do
+      Mysql2Model2.all(:limit => 1000).each{ |r|
+        r.date_test
+        r.date_time_test
+        r.timestamp_test
+      }
+    end
+  end
+
+  x.report "Mysql (with lazy casting, read date/datetime/timestamp attrs)" do
+    MysqlModel.establish_connection(mysql_opts)
+    number_of.times do
+      MysqlModel.all(:limit => 1000).each{ |r|
+        r.date_test
+        r.date_time_test
+        r.timestamp_test
+      }
+    end
+  end
+end
+
+GC.start
+puts
+puts
 Benchmark.bmbm do |x|
-  x.report "Mysql2" do
-    Mysql2Model.establish_connection(mysql2_opts)
+  x.report "Mysql2 (with auto casting, read all attrs)" do
     number_of.times do
       Mysql2Model.all(:limit => 1000).each{ |r|
         r.attributes.keys.each{ |k|
@@ -38,7 +108,17 @@ class MysqlModel < ActiveRecord::Base
     end
   end
 
-  x.report "Mysql" do
+  x.report "Mysql2 (with lazy casting, read all attrs)" do
+    number_of.times do
+      Mysql2Model2.all(:limit => 1000).each{ |r|
+        r.attributes.keys.each{ |k|
+          r.send(k.to_sym)
+        }
+      }
+    end
+  end
+
+  x.report "Mysql (with lazy casting, read all attrs)" do
     MysqlModel.establish_connection(mysql_opts)
     number_of.times do
       MysqlModel.all(:limit => 1000).each{ |r|