I think the subset and submap would be a nice addition! Op maandag 15 februari 2010 16:23:22 UTC+1 schreef Rich Hickey: > > On Mon, Feb 15, 2010 at 8:45 AM, George . <cloju...@gmail.com > <javascript:>> wrote: > > Currently, if you want to perform a range query on a sorted-seq (AKA > > PersistentTreeMap), you are are advised to use the subseq wrapper for > > seqFrom. > > > > For instance, let's say your keys are dollar values you could do (subseq > > my-map > 30) to get all entries with keys greater than 30 or (subseq > my-map > >> 30 < 100) to get all entries with keys that range between 30 and 11. > The > > former case is O(logN) as it is entirely delegated to the logarithmic > > seqFrom method. However, the latter example has worst case O(N) behavior > > since subseq is doing a take-while after .seqFrom. > > > > Is there any plan to support upper bounds directly within seqFrom in > order > > to make the worst-case behavior logarithmic all around? > > > > If not, would such a patch even be considered or is the simplicity of > > implementation an overriding factor? > > > > > > I'm confused. Do you want something other than a seq of values in > range as a result? Because if there are K things in range, there is no > way to consume them in complexity less than O(K). That cost won't be > incurred until you consume them, due to take-while being lazy. > > OTOH, if what you want is a subset or submap, or, from them, a > constant-time count, well, that's a different function altogether. I'm > not opposed to subset or submap proposals. > > Rich > >
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