Gregory Stark wrote: > "Bruce Momjian" <[EMAIL PROTECTED]> writes: > > > Gregory Stark wrote: > > > >> Is your database initialized with C locale? If so then length(text) is > >> optimized to not have to detoast: > >> > >> if (pg_database_encoding_max_length() == 1) > >> PG_RETURN_INT32(toast_raw_datum_size(str) - VARHDRSZ); > > > > Wow, we optimized length(). OK, will run the test with > > substring(t,1,1). > > No, we did substring() too :)
Uh, I looked at text_substring(), and while there is an optimization to do character counting for encoding length == 1, it is still accessing the data. -- Bruce Momjian <[EMAIL PROTECTED]> http://momjian.us EnterpriseDB http://www.enterprisedb.com + If your life is a hard drive, Christ can be your backup. + ---------------------------(end of broadcast)--------------------------- TIP 7: You can help support the PostgreSQL project by donating at http://www.postgresql.org/about/donate
