Simon Riggs wrote
>> Can you CLUSTER
>> against a minmax index?
>
> Not in this release, at least in my understanding. It's not yet
> possible to do an ordered fetch, so the cluster scan probably won't
> work.
As per the patch I helped writing, CLUSTER should use the
sequential heap scan+sort when "it makes sense".
So I think that if the index is not able to do an ordered fetch,
CLUSTER should fall back to scan+sort automatically (which is
what you want in a large table anyway).
Obviously, that should be tested.
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