Sphinx 0.9.7 will feature an arbitrary number of group id's, so it would be possible to handle "search this thread" and search by user in Sphinx.
Meanwhile, it's easy to hack Sphinx to support 3 groupid columns instead of one by some copy-pasting. Naturally, the index size is larger with additional group id's, 5GB for 6mln post database. We've been running it for some months already with great success.
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