Hi All,
I think it is an issue in the way that the xpath spec is included in the
SPARQL 1.1 spec, in an unclear manner.
e.g.
SELECT *
WHERE
{
VALUES ?s { "abc" "abcd" "abd" "AB" "" UNDEF "ACCCCCCCCA" }
BIND(substr(str(?s), 3, 1) AS ?lastChar)
}
Gives an error as described. But I think that it should give
---------------------------
| s | lastChar |
===========================
| "abc" | "c" |
| "abcd" | "c" |
| "abd" | "d" |
| "AB" | "" |
| "" | "" |
| | |
| "ACCCCCCCCA" | "C" |
---------------------------
As results.
This example
* fn:substring("12345", 5, -3) returns "".
Characters at positions greater than or equal to 5 and less than 2 are
selected.
from https://www.w3.org/TR/xpath-functions/#func-substring
supports that interpretation.
The filter being discarded is probably a query optimization
that allows this bug to be triggered. But the underlying problem
is that the function should (I think) return an "" instead of an error.
Regards,
Jerven
On 02/11/16 10:29, Jindřich Mynarz wrote:
> SELECT *
> WHERE
> { { SELECT *
> WHERE
> { VALUES ?s { "abc" "abcd" "abd" } }
> }
> FILTER ( strlen(str(?s)) = 3 )
> BIND(substr(str(?s), 3, 1) AS ?lastChar)
> }
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Jerven Bolleman Jerven.Bolleman@sib.swiss
SIB Swiss Institute of Bioinformatics Tel: +41 (0)22 379 58 85
CMU, rue Michel Servet 1 Fax: +41 (0)22 379 58 58
1211 Geneve 4,
Switzerland www.sib.swiss - www.uniprot.org
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