Gregory Stark <[EMAIL PROTECTED]> writes: > It's possible there's some sort of "block-wise correlated" measure > which would be even better for our needs.
Actually, it seems obvious to me that the correlation measure ought to ignore within-block ordering, but right now it does not. OTOH it's not clear how important that is, as on a decent-size table you'll probably not have more than one sample row in a block anyway. regards, tom lane ---------------------------(end of broadcast)--------------------------- TIP 4: Have you searched our list archives? http://archives.postgresql.org