Hi David,
Is this something new? I'm asking bacause I got into this exactly out of
CSS style filters, that do contain negations, without any null handling,
and as a result upend up not painting the features with null values.
I dont have the style handy now, but I can share it tomorrow if you want to
have a look
Cheers
Andrea
Il 03/feb/2014 21:49 "David Winslow" <dwins...@boundlessgeo.com> ha scritto:
> FWIW the simplifier in my CSS converter just adds (or removes) the IS NOT
> NULL logic. I've tried it a few ways and this seems the only way to be
> consistent across two-state and three-state logic systems.
>
> Might be nice if GeoTools were to emulate three-state logic for in-memory
> systems, but I'm not sure it's feasible to have three-state for all
> backends.
>
>
> On Mon, Feb 3, 2014 at 3:45 PM, Andrea Aime
> <andrea.a...@geo-solutions.it>wrote:
>
>> On Mon, Feb 3, 2014 at 9:41 PM, Jody Garnett <jody.garn...@gmail.com>wrote:
>>
>>> I admit de morgan is a pain to implement, but I would find the result
>>> more intuitive then null checks suddenly appearing.
>>>
>>
>> Easier to read, yes, easier to index, maybe, but ... more intuitive?
>> How do you explain a end user that he wrote "not(a > 3 and b = 5 and c
>> <= 10)"
>> and the code is running "a <=3 or b < 5 or b > 5 or c > 10" and that is
>> fully equivalent,
>> actually, it is better?
>>
>> Also, I still have to verify that what we discussed so far actually
>> brings the database
>> 3 state logic back to our 2 state one in a fully equivalent manner: think
>> nested filters
>> or combinations, I believe that once even one bit is unknown, everything
>> just flips
>> into that state, and that the only way to get out of it is to have
>> explicit "is null", "is not null"
>> statements...
>> Have to check.
>>
>> Cheers
>> Andrea
>>
>>
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>
>
> --
> David Winslow
> Boundless - http://boundlessgeo.com/
>
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