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Have seen a few different projects not supporting MySQL 5.7 because ONLY_FULL_GROUP_BY being turned on by default is breaking things (dev.mysql.com/doc/refman/5.7/e).

That can happen when you start by deliberately ignoring standards and then slowly start implementing them as you realize why they were part of the standard (SQL-92 in this case) in the first place?

Previous behaviour: "the values chosen [were] nondeterministic, which is probably not what you want"

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