Hannu Krosing <hannu(at)skype(dot)net> writes:
> hel kenal peval, E, 2007-09-03 kell 19:55, kirjutas Tom Lane:
>> No, because part of the deal is that you can do lookups using only the
>> leading index columns. At least, all the existing multicolumn index
>> types can do that.
> One approahc is not to mix hashes, but to partition the hash, so that
> each column gets its N bits in the hash.
How does that help? You still need all the keys to find out which
bucket to look in.
regards, tom lane