Re: [nft PATCH 3/4] segtree: Merge get_set_interval_find() and get_set_interval_end()

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On Thu, Apr 30, 2020 at 05:48:42PM +0200, Phil Sutter wrote:
> On Thu, Apr 30, 2020 at 05:37:29PM +0200, Pablo Neira Ayuso wrote:
> > On Thu, Apr 30, 2020 at 05:14:07PM +0200, Phil Sutter wrote:
> > > Both functions were very similar already. Under the assumption that they
> > > will always either see a range (or start of) that matches exactly or not
> > > at all, reduce complexity and make get_set_interval_find() accept NULL
> > > (left or) right values. This way it becomes a full replacement for
> > > get_set_interval_end().
> > 
> > I have to go back to the commit log of this patch, IIRC my intention
> > here was to allow users to ask for a single element, then return the
> > range that contains it.
> 
> That was my suspicion as well, but while testing I found out that no
> matter what I passed to 'get element', I couldn't provoke a situation in
> which get_set_interval_find() would have left and right elements which
> didn't match exactly (or not at all).
> 
> There must be some preparation happening before the call to
> get_set_decompose() which normalizes things. And still, If I disable the
> call to get_set_decompose() entirely, tests start failing.

Hm, so the approximate or exact matching is broken? Or you mean they
fail because you didn't expect the approximate matching?



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