that is good question, why down vote it ?
FWIIW in high altitude aviation where digestive gas could cause debilitating pain or even life threatening injury, the solution is to eat food that doesn't make you fart; usually steak and eggs. I'm sure the astronaut nutritionist types have this issue under control. People forget how many zillions of dollars went into the early space program to figure stuff like this out.
And despite zillions of dollars wenting into it, if it would be just the smell, I believe it is possible someone just would have said, deal with it, there are bigger concerns in space, like keeping people alive.
(but charcoal filters work, like someone else pointed out)
And since you cannot really shower in space, I doubt the smell is the nicest up there.
A little gross, yes, but definitely not insipid. And yes, we assume that there's some solution (or that it's not a problem) somehow, but it's reasonable to be curious what the solution is.