> Here's an off-the-wall thought... since most of the CPU time is in the
> sort, what about allowing a backend to fork off dedicated sort
> processes? Aside from building multiple indexes at once, that
> functionality could also be useful in general queries.
Sure, that would be cool. And also a lot of work :-). The comparison
operators can be arbitrarily complex, potentially querying other tables
etc, so you would indeed need pretty much all the infrastrucutre you
need to solve the general case.
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