Greetings!
I've created a patch against the v2.3.4 release which fixes a long- standing configuration problem that prevented the use of MySQL stored procedures from Rails. People have been talking about this issue for a few years but no one has ever submitted a patch for it. It's really annoying when you run into the problem, though. Especially if you have put a lot of effort into your stored procedures!
I created ticket #3151 (at #3151 MySQL adapter update to enable use of stored procedures - Ruby on Rails - rails) which has my patch, plus more information.
It's a very small change and is not enabled by default, so the impact should be limited, unless you need it.
I followed the guidelines on submitting a patch at https://rails.lighthouseapp.com/projects/8994/sending-patches. Please let me know what I can do to facilitate reviewing this patch.