On 04/20/2014 07:46 AM, Oleg Bartunov wrote:
btw, 9.4 should be wiser in case of rare+common terms, thanks to GIN fast scan feature.
Indeed, although we didn't actually do anything to the planner to make it understand when fast scan helps. Doing something about cost estimation is still on the 9.4 Open Items list, but I don't have any ideas on what to do about it, and I haven't heard anything from Alexander about that either. That means that the cost estimation issue Laurence saw is going to be even worse in 9.4, because GIN is going to be faster than a seq scan in more cases than before and the planner doesn't know about it.
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