On Fri, Sep 6, 2013 at 1:34 PM, Jeremy Harris <j...@wizmail.org> wrote: >> What's an index-hash operation? > > Ones that hit tuplesort_begin_index_hash()
Oh. Well, it looks to me like that function can only get called when building a hash index. Specifically, according to the comment in hashbuild(), a hash index projected to be larger than shared_buffers. The regression tests are generally designed to work on small amounts of data since they need to run quickly, so this isn't too surprising. Hash indexes are a somewhat underwhelming feature anyway, since btrees typically perform as well or better, and since hash indexes are not WAL-logged and therefore can be corrupted on a crash. -- Robert Haas EnterpriseDB: http://www.enterprisedb.com The Enterprise PostgreSQL Company -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
