Hackers, Very interesting design document for SQLite 4:
http://www.sqlite.org/src4/doc/trunk/www/design.wiki I'm particularly intrigued by "covering indexes". For example: CREATE INDEX cover1 ON table1(a,b) COVERING(c,d); This allows the following query to do an index-only scan: SELECT c, d FROM table1 WHERE a=? AND b=?; Now that we have index-only scans in 9.2, I'm wondering if it would make sense to add covering index support, too, where additional, unindexed columns are stored alongside indexed columns. And I wonder if it would work well with expressions, too? David -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
