"Bruce Momjian" <bruce@momjian.us> 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 :)
You could try hashtext()
-- Gregory Stark EnterpriseDB http://www.enterprisedb.com