Tomas Vondra <[email protected]> writes:
> Well, until this point we've discussed failure cases involving 'AND'
> conditions. What about 'OR' conditions? I think the current optimizer
> computes the selectivity as 's1+s2 - s1*s2' (at least that's what I
> found in backend/optimizer/path/clausesel.c:630).
If you can solve the AND case, the OR case falls out of that. Just
replace s1*s2 with a more accurate AND calculation.
regards, tom lane
--
Sent via pgsql-hackers mailing list ([email protected])
To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-hackers
