Hello Tatsuo-san,
While playing with pgbench, I found multiple "-M query_mode" can be set more than once.
As already said by others, the "last one win" is somehow a useful feature, so I'd prefer avoiding erroring out on this one.
This could leave:(1) improving pgbench doc by spelling out the last one win behavior, but this is rather standard ;
(2) only warning when this accurs, but that would become noisy for legitimate uses ;
(3) doing nothing about it. -- Fabien.
