From cdb_driver.cpp:81 and cdb_driver.cpp:97
// FIXME (obfuscated#): Implement user arguments
so looks like CDB ignores user arguments ATM.
I have just commited a patch to fix this, I can not test it because I do not have CDB, but the change is straightforward:
+ if (!userArguments.empty())
+ cmd << ' ' << userArguments;