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Changes between Version 1 and Version 2 of Ticket #34523, comment 13

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32		As for the heuristics to determine if a backend supports transaction the situation is definitely weird on MySQL as supports is on a per-table basis and `default_storage_engine` is really just a guess at that.
	32	As for the heuristics to determine if a backend supports transaction the situation is definitely weird on MySQL as supports is on a per-table basis and `default_storage_engine` is really just a guess at that. In this sense 331a460f8f2e4f447b68fba491464b68c9b21fd1 is backward incompatible as it stopped using savepoints which could have an impact on setups that have mixed storage engines. Not sure if this is a supported setup though.