Comment 3 for bug 804570

There is no implementation for CURTIME() and CURRENT_TIME()( although CURDATE() and CURRENT_DATE() works), but these are still available in documentation.
http://docs.drizzle.org/functions/current_time_functions.html

admins should probably remove them from docs.

my experience with trial..

drizzle> select current_time();
ERROR 1305 (42000): FUNCTION current_time does not exist
drizzle> select curtime();
ERROR 1305 (42000): FUNCTION curtime does not exist
drizzle> SELECT CURTIME();
ERROR 1305 (42000): FUNCTION CURTIME does not exist
drizzle> SELECT CURTIME() + 0;
ERROR 1305 (42000): FUNCTION CURTIME does not exist
drizzle> SELECT current_time() + 0;
ERROR 1305 (42000): FUNCTION current_time does not exist