Hi Andrea,
In terms of "native" support for arcs, I believe the answer is "area,
length, distance, indexes and supportive output formats", full stop.
Everything else that accepts them does linearization.
In terms of future improvements, I know of no ongoing work,
particularly in the realm of things like constructive geometry or full
predicate support. Unfortunately it's always been a somewhat narrow
niche.
ATB,
P


On Mon, Mar 12, 2018 at 8:24 AM, Andrea Aime
<andrea.a...@geo-solutions.it> wrote:
> Hi,
> is there any document outlining the current status of arc support in
> PostGIS?
> In particular, a list of functions that can those that work off the native
> curves, and those that  linear-ization instead (eventually, those that do
> not work at all against curvilinear geometries)?
> Maybe (and I might be dreaming here :-) ) with some indication of whether
> they will be improvements in that regard?
>
> Cheers
> Andrea
>
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