Add a fast pre-check for equality of equal-length strings. Testing reveals that that doing a memcmp() before the strcoll() costs practically nothing, at least on the systems we tested, and it speeds up sorts containing many equal strings significatly.
Peter Geoghegan. Review by myself and Heikki Linnakangas. Comments rewritten by me. Branch ------ master Details ------- http://git.postgresql.org/pg/commitdiff/e246b3d6eac09d0770e6f68e69f2368d02db88af Modified Files -------------- src/backend/utils/adt/varlena.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) -- Sent via pgsql-committers mailing list ([email protected]) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-committers
