[paulryanrogers]

IIRC it wasn't a big break from 5.7 unless you used some odd grouping or relied on its old+lossy defaults.

Though the single threaded performance fell off a cliff, tanking my CI performance.

Maria DB evolved very differently. I'm not sure how they stack up performance wise.

[donatj]

You can re-enable the old group by behavior, which we did.