Hello Jindřich,
can you show the query maybe?
I couldn't reproduce this with some dummy data produced by VALUES, but I
don't know how you use FILTER and substring afterwards:
SELECT *
WHERE
{ { SELECT *
WHERE
{ VALUES ?s { "abc" "abcd" "abd" } }
}
FILTER ( strlen(str(?s)) = 3 )
BIND(substr(str(?s), 3, 1) AS ?lastChar)
}
Kind regards,
Lorenz
> Hi Hugh,
>
> producing a minimal test case to reproduce the behaviour is indeed the
> difficult part. I've been trying to do that without success. So far
> I'm able to replicate the behaviour only with my full database. I'll
> reopen this if I manage to narrow down the data required to replicate
> the behaviour.
>
> - Jindřich
>
> --
> Jindřich Mynarz
> http://mynarz.net/#jindrich
>
> On Wed, Nov 2, 2016 at 2:48 AM, Hugh Williams
> <hwilli...@openlinksw.com <mailto:hwilli...@openlinksw.com>> wrote:
>
> Hi Jindřich,
>
> Can you please provide a test case (data & query) to demonstrate
> the issue ?
>
> Best Regards
> Hugh Williams
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>> On 1 Nov 2016, at 15:26, Jindřich Mynarz
>> <mynarzjindr...@gmail.com <mailto:mynarzjindr...@gmail.com>> wrote:
>>
>> Hi Lorenz,
>>
>> On Tue, Nov 1, 2016 at 4:18 PM, Lorenz B.
>> <buehm...@informatik.uni-leipzig.de
>> <mailto:buehm...@informatik.uni-leipzig.de>> wrote:
>>
>> how do you apply both FILTERs?
>>
>> I use FILTER (STRLEN(?literal) = 8) followed by BIND
>> (SUBSTR(?literal, 8, 1) AS ?eighth).
>>
>> Obviously the filter on the length needs to be evaluated
>> first, and I'm wondering how this would be evaluated if
>> somebody uses FILTER(cond1 && cond2) as && should be commutative.
>>
>> Exactly. It seems however that Virtuoso may reverse the order of
>> the FILTER. I tried using sub-SELECT with no effect. What worked
>> was a particularly clumsy reformulation of the original update
>>
>> (https://github.com/jindrichmynarz/vvz-to-rdf/commit/3c7ab9e0ad34b024b33c8fa626a71bb18947503f
>>
>> <https://github.com/jindrichmynarz/vvz-to-rdf/commit/3c7ab9e0ad34b024b33c8fa626a71bb18947503f>).
>>
>> - Jindřich
>>
>> --
>> http://mynarz.net/#jindrich
>>
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--
Lorenz Bühmann
AKSW group, University of Leipzig
Group: http://aksw.org - semantic web research center
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