when map permissions are checked sometimes useless queries may be executed, like

SELECT DISTINCT t.triggerid FROM triggers t,functions f,items i,hosts_groups hg,rights r,users_groups ug WHERE ((t.triggerid BETWEEN 000000000000000 AND 099999999999999)) AND f.triggerid=t.triggerid AND f.itemid=i.itemid AND hg.hostid=i.hostid AND r.id=hg.groupid AND r.groupid=ug.usrgrpid AND ug.userid=4 AND r.permission>=3 AND NOT EXISTS( SELECT ff.triggerid FROM functions ff, items ii WHERE ff.triggerid=t.triggerid AND ff.itemid=ii.itemid AND EXISTS( SELECT hgg.groupid FROM hosts_groups hgg, rights rr, users_groups gg WHERE hgg.hostid=ii.hostid AND rr.id=hgg.groupid AND rr.groupid=gg.usrgrpid AND gg.userid=4 AND rr.permission<3)) AND (t.triggerid IN (-1))