On Thu, Jul 1, 2010 at 11:21 AM, Tom Lane <t...@sss.pgh.pa.us> wrote: > In particular, I recall some discussions about developing a "streaming > API" whereby an index AM could return a bitmap page-by-page or so, > rather than having to construct the whole thing in-memory before > anything could happen. This would be a huge win for AND/OR cases, > and even for a simple indexscan it would eliminate the existing startup > cost penalty for a bitmap scan. Streaming like this would also > eliminate the problem of having to lossify large bitmaps in order to > not overrun memory.
Now that would be cool. The existing startup penalty for a bitmap scan is the pits. -- Robert Haas EnterpriseDB: http://www.enterprisedb.com The Enterprise Postgres Company -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
