[MARMOTTA-640] multiple UNIONs not handled

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 3.3.0
• Fix Version/s: 3.4.0
• Component/s: KiWi Triple Store
• Labels: sparql sql
• Assignee: Sergio Fernández
• Reporter: Rob Atkinson
• Created: 03/Jun/16 13:37
• Updated: 18/Jun/18 19:31
• Resolved: 20/Jun/16 10:49

Description

fails with query below - but removing any of the union clauses works

PREFIX  dcterms: <http://purl.org/dc/terms/>
PREFIX  rdfs: <http://www.w3.org/2000/01/rdf-schema#>
PREFIX  void: <http://rdfs.org/ns/void#>
PREFIX  rdf:  <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX  lid:  <http://id.sirf.net/def/schema/lid/>

SELECT *
WHERE
  {   { { <http://resources.opengeospatial.org/def/voc/examples/mdg> rdf:type ?___0 }
        OPTIONAL
     { { ?___0 rdfs:label ?___1 } }
      }
    UNION
      { <http://resources.opengeospatial.org/def/voc/examples/mdg> rdfs:label ?___2 }
    UNION
      { <http://resources.opengeospatial.org/def/voc/examples/mdg> void:sparqlendpoint ?___10 }  
    }

Issue Links

• is superceded by: MARMOTTA-651 CONSTRUCT Queries return no results
• is superceded by: MARMOTTA-652 The fix to MARMOTTA-640 (SPARQL UNION) broke all UNION tests
• links to: GitHub Pull Request #20