[postgis-devel] Bit setting to compress PostGIS geometries

[Nicklas Avén]

Hello
Very interesting!
Will the compression and decompression also be faster? I guess it is
easier to crunch the zeros than random numbers?
I tried to create a bytea type with external storage just to see if
compression has an impact on performance, but it was apperantly a
little more complicated than just reusing the input and oputput
functions from original bytea.When I was working on the TWKB format I
found that twkb-compression was very much faster than gzip compression
of a file outside the database with the same data as wkb,But maybe the
compression technique postgresql uses is faster (and probably
compresses less than ordinary zip)


/Nicklas 

On Fri, 2018-02-16 at 09:38 -0500, Daniel Baston wrote:
> Hi,
> I've been experimenting with a cool technique to reduce the size of
> PostGIS geometries by setting insignificant bits to zero, which makes
> the geometry objects more compressible.
> 
> I described the technique in a post here, which shows some test
> results:
> http://www.danbaston.com/posts/2018/02/15/optimizing-postgis-geometri
> es.html
> 
> I'm on the fence about whether something like this has a place in the
> PostGIS core, but am leaning towards "yes." What do others think?
> 
> Dan
> 
> 
> 
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