Comment 2 for bug 783423

Having a conversation in the description is a bit weird so I'll follow up here like normal ;)

For packagesets, 'is in LIST' or even a simple 'matches ITEM' will suffice.

For package uploader/maintainer name, using a vocab is fine.

For substring on package name, we are searching across DistroSeriesDifference, which has a FK to SourcePackageName and we want "SPN.name LIKE %criteria%'