Hi, Andrea,
if you aren't using prepared statements, it doesn't know that the data is
binary and it will "kick back" to the standard encoding (with a lot of
"\001"-like in the text). It will work, but you are at approximately 300%
overhead.
As mentioned, above, I believe it works for PostgreSQL 8.2+ (December 2006).
I did take a look at TWKB, but for GeoGig purposes, the loss of precision
is a problem. However, I am planning to look into it - it makes huge space
savings when you are looking at already-reduced-precision geometries.
I was also going to look at TWKB-like lossless encoding
(ie. Double#doubleToLongBits() and then using a TWKB-like int-diff
encoding). However, it's likely better to just LZ4 the WKB. When I do the
testing, I'll let you know what happens.
Either way, encoding TWKB as real "binary" (wrt Base64) will be another big
win.
Thanks,
Dave
On Tue, May 30, 2017 at 10:43 AM, Andrea Aime <andrea.a...@geo-solutions.it>
wrote:
> On Tue, May 30, 2017 at 7:01 PM, Dave Blasby <dbla...@boundlessgeo.com>
> wrote:
>
>> Hi, Andrea,
>>
>> Only updating the driver version.
>>
>> I can work with the PostGIS maintainer to get it in - it's fairly easy
>> (just need to ensure that you are using prepared statements).
>>
>
> Maintainer eh? It used to be me and Justin.
> When you say "ensure that you are using prepared statements" is that only
> to get the actual binary transfer, or it would just
> break?
> And does that require some specific version of postgresql?
>
> The 25% less transfer is interesting, wondering if you have been looking
> at TWKB, that should provide greater savings (with
> some potential loss of precision).
>
> Cheers
> Andrea
>
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