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New engine for MultiIndex? #18519
In principle, a completely different scheme could be used:
In most cases, the second part should be the computationally expensive one. It would consist in running
Moreover (and maybe more importantly), with the current engine fixing a bug such as #18485 is a nightmare. And the same applies to
and probably others. This is because even though levels are not mixed, the elements are compared as
One caveat is that the single levels would be very often non-unique, and I'm not sure what is the impact of this with the current implementation of hash tables.
And while the
that is, large indexes are free from #18485 and friends.