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user-inactivated · 3483 days ago · link · · parent · post: Reddit changes community guideliness, bans subreddits.
Comment threads are one of the worst cases for text search, because you're comparing short texts (query strings) to short texts (comments). There are ways to make it work, but most of them involve crunching some very big matrices periodically, and you don't want to do that if you don't have some big iron to do it on.