> 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.
Taral