[postgis-devel] What's the difference between geom_accum and built in postgresql array_append

[Kevin Neufeld]

I could be way off on this, but I suspect the reason is because it looks 
like array_append was introduced in PostgreSQL in 7.1, after or about 
the same time PostGIS was born.

-- Kevin

Obe, Regina wrote:
> I was trying to take a stab at understanding the postgis internal
> workings and one question that has always puzzled me is
> 
> Why are we using a postgis geom_accum function instead of the built in
> PostgreSQL array_append function to define our aggregates.  I did a
> couple of simple tests and the timings always seem pretty much exactly
> the same.
> 
> The only thought I could think of why this was done was
> 1) Its easier to debug the internal workings of the array
> 2) and its possible to internally throw PostGIS specific errors
> 
> Does that about sum it up or are there other reasons I am missing?
> 
> Thanks,
> Regina
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