https://bugzilla.wikimedia.org/show_bug.cgi?id=62150
Bug ID: 62150
Summary: SMWSparqlDatabaseError Malformed query order by:
Unresolved prefixed name
Product: MediaWiki extensions
Version: master
Hardware: All
OS: All
Status: UNCONFIRMED
Severity: normal
Priority: Unprioritized
Component: Semantic MediaWiki
Assignee: wikibugs-l@lists.wikimedia.org
Reporter: gcarnev...@imolinfo.it
CC: jamesin.hongkon...@gmail.com, jeroen_ded...@yahoo.com,
mar...@semantic-mediawiki.org, nischay...@gmail.com
Web browser: ---
Mobile Platform: ---
Created attachment 14728
--> https://bugzilla.wikimedia.org/attachment.cgi?id=14728&action=edit
Fixed SMW_SparqlStoreQueryEngine.php file
OS: Centos 6.5
MediaWiki: 1.22.2
When I try to execute a sparql query with an order-by clause I have the
following error:
Unexpected non-MediaWiki exception encountered, of type
"SMWSparqlDatabaseError" . The output of sparql validator query is:
"Unresolved prefixed name".
==============================================================================
Output query example:
PREFIX wiki: <http://.....>
PREFIX rdf: <http://.....>
PREFIX rdfs: <http://.....>
PREFIX owl: <http://.....>
PREFIX swivt: <http://.....>
PREFIX property: <http:.....>
PREFIX xsd: <http://.....>
PREFIX yyy: <http://.....>
SELECT DISTINCT ?result WHERE {
?result xxx:some_instance ?v2 .
{ ?result rdf:type wiki:Categoria_instance . }
?result yyy:isVersionOf ?someVersion .
}
ORDER BY ASC(?v2)
OFFSET 0
LIMIT 501
The xxx prefix is not present in prefix list
==============================================================================
A possible solution we found to fix this problem is to modify
addMissingOrderByConditions method in the class
extensions/SemanticMediaWiki/includes/storage/SMW_SparqlStoreQueryEngine.php,
adding the following line
$sparqlCondition->namespaces = array_merge($sparqlCondition->namespaces,
$auxSparqlCondition->namespaces);
after line 942:
$sparqlCondition->weakConditions[$sparqlCondition->orderVariables[$propkey]] =
$auxSparqlCondition->getWeakConditionString() .
$auxSparqlCondition->getCondition();
I have attached to this issue the fixed class file.
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