On Thu, Dec 12, 2013 at 4:13 PM, Jeff Janes <jeff.ja...@gmail.com> wrote: >> Well, why not take a supersample containing all visible tuples from N >> selected blocks, and do bootstrapping over it, with subsamples of M >> independent rows each? > > > Bootstrapping methods generally do not work well when ties are significant > events, i.e. when two values being identical is meaningfully different from > them being very close but not identical.
Yes, that's why I meant to say (but I see now that I didn't) that it wouldn't do much for n_distinct, just the histogram. -- Sent via pgsql-hackers mailing list (firstname.lastname@example.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers