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ACTION-330 test cases around '+' for string concatenation

From: Axel Polleres <axel.polleres@deri.org>
Date: Tue, 30 Nov 2010 13:52:36 +0000
Message-Id: <CD656676-FB9D-4689-8C7B-BB6C5AF08C87@deri.org>
To: SPARQL Working Group <public-rdf-dawg@w3.org>
I put in two test cases for using '+' for string concatenation and put them in the manifest within the expr-builtin directory:

 tests/data-r2/expr-builtin


Data:

@prefix : <http://example/> .
@prefix  xsd:    <http://www.w3.org/2001/XMLSchema#> .

:x1 :p  "a" ; :q 1 .
:x2 :p  _:b ; :q "1".
:x3 :p  :a ; :q "1".
:x4 :p  1 ; :q 2 .
:x5 :p  1.0 ; :q 2 .
:x6 :p  "1" ; :q "2" .
:x7 :p  "1"^^xsd:string ; :q "2" .
:x8 :p  "1"^^xsd:string ; :q 2 .


plus-1:

PREFIX  : <http://example/>
SELECT  ?x ?y ( ?x + ?y AS ?sum)
WHERE
    { ?s :p ?x ; :q ?y . 
    }
ORDER BY ?sum


query q-plus-2.rq:

PREFIX  : <http://example/>
SELECT  ?x ?y ( str(?x) + str(?y) AS ?sum)
WHERE
    { ?s :p ?x ; :q ?y . 
    }
ORDER BY ?sum

I checked in results files (.srx) which reflect the *current* behaviour I assume of most engines, 
i.e. that "+" wouldn't work for concatentation.


I assume - if we want to allow '+' for concatenation, what we'd want as results is the following:

query q-plus-1.rq :
---------------------------------------------------------------
| x                                              | y   |  sum |
===============================================================
| _:b0                                           | "1" |      |
| :a                                             | "1" |      |
| "1"                                            | "2" | "12" | <-- new!
| 1                                              | 2   | 3    |
| "1"^^<http://www.w3.org/2001/XMLSchema#string> | "2" | "12" | <-- new!
| "1"^^<http://www.w3.org/2001/XMLSchema#string> | 2   |      |
| 1.0                                            | 2   | 3.0  |
| "a"                                            | 1   |      |
---------------------------------------------------------------

query q-plus-2.rq:

------------------------------------------------------------------------------
| x                                              | y   |  sum                |
==============================================================================
| _:b0                                           | "1" |                     |
| :a                                             | "1" | "http://example/a1" | <-- new! 
| "1"                                            | "2" | "12"                | <-- new! 
| 1                                              | 2   | "12"                | <-- new!
| "1"^^<http://www.w3.org/2001/XMLSchema#string> | "2" | "12"                | <-- new!
| "1"^^<http://www.w3.org/2001/XMLSchema#string> | 2   | "12"                | <-- new!
| 1.0                                            | 2   | "1.02"              | <-- new!
| "a"                                            | 1   | "a1"                | <-- new!
------------------------------------------------------------------------------
 

comments welcome,
Axel
Received on Tuesday, 30 November 2010 13:53:09 GMT

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