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> > How do we do that with UNION, and return the right rows. Seems the
> > _join_ happending multiple times would be much worse than the factoring.
>
> Ok... We have two problems:
>
> 1) DNF for unjoined queries.
> 2) Factorization for the rest.
>
> I have some solutions for (1). Not for (2). Remember that unjoined queries
> are quite common. :)
>
> For (1), we can always try to parallel the multiple queries... especially in
> the case where a sequential search is required.
I don't know how to return the proper rows with UNION.
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