Stardog 5 beta - Construct shorthand not working

Support Bug
1

Hi,

The following query worked on 4.3, but doesn’t in 5.0 beta.

construct where {                                                                                          
   ?registrering arkiv:parent ?parent.                                             
   ?registrering a ?registreringType.                                              
   ?parent a ?parentType.                                                      
                                                                                                   
   OPTIONAL{?registrering <http://www.arkivverket.no/standarder/noark5/arkivstruktur/journalsekvensnummer> ?journalsekvensnummer.}            
   OPTIONAL{?registrering <http://www.arkivverket.no/standarder/noark5/arkivstruktur/journalaar> ?journalaar.}                                                 
   OPTIONAL{?registrering <http://www.arkivverket.no/standarder/noark5/arkivstruktur/journalpostnummer> ?journalpostnummer.}                 
 

}

# Overrides by the API: 
# PARAMETERS ( ?registrering ) {
# <http://example.com/base/journalpost--journalpost%3A200033--972417831--2016-03-04T18%3A28%3A45_UNDER_UNDER>
# }

Here is my java code:

							stardogService.getStardogDatabase().connection(Reasoning.DISABLED, connection -> {

								GraphQuery query = connection.graph(String.join("\n",
										"construct where {                                                                                          ",
										"   ?registrering arkiv:parent ?parent.                                             ",
										"   ?registrering a ?registreringType.                                              ",
										"   ?parent a ?parentType.                                                      ",
										"                                                                                                   ",
										"   OPTIONAL{?registrering <" + Arkiv.journalsekvensnummer + "> ?journalsekvensnummer.}            ",
										"   OPTIONAL{?registrering <" + Arkiv.journalaar + "> ?journalaar.}                                                 ",
										"   OPTIONAL{?registrering <" + Arkiv.journalpostnummer + "> ?journalpostnummer.}                 ",
										" ",
										"",
										"}",
										"")).parameter("registrering", registrering);
								retConnection.add(query.execute());

							});

Here is the error:

Caused by: com.complexible.stardog.plan.parser.QueryParseException: can not use shorthand CONSTRUCT: graph pattern in WHERE clause is not a basic pattern.
	at com.complexible.stardog.plan.parser.QueryParserImpl$GeneratePlan$2.defaultVisit(QueryParserImpl.java:2021)
	at com.complexible.stardog.plan.parser.QueryParserImpl$GeneratePlan$2.visitJoin(QueryParserImpl.java:2004)
	at com.complexible.stardog.plan.BasePlanNodeVisitor.visit(BasePlanNodeVisitor.java:85)
	at com.complexible.stardog.plan.LoopJoinPlanNode.accept(LoopJoinPlanNode.java:54)
	at com.complexible.stardog.plan.parser.QueryParserImpl$GeneratePlan.visit(QueryParserImpl.java:2024)
	at com.complexible.stardog.plan.parser.QueryParserImpl$GeneratePlan.visit(QueryParserImpl.java:595)
	at com.complexible.common.rdf.query.parser.sparql.ast.ASTConstruct.jjtAccept(ASTConstruct.java:19)
	at com.complexible.stardog.plan.parser.QueryParserImpl$GeneratePlan.query(QueryParserImpl.java:2196)
	at com.complexible.stardog.plan.parser.QueryParserImpl$GeneratePlan.visit(QueryParserImpl.java:1357)
	at com.complexible.stardog.plan.parser.QueryParserImpl$GeneratePlan.visit(QueryParserImpl.java:595)
	at com.complexible.common.rdf.query.parser.sparql.ast.ASTConstructQuery.jjtAccept(ASTConstructQuery.java:19)
	at com.complexible.stardog.plan.parser.QueryParserImpl$GeneratePlan.visit(QueryParserImpl.java:1339)
	at com.complexible.stardog.plan.parser.QueryParserImpl$GeneratePlan.visit(QueryParserImpl.java:595)
	at com.complexible.common.rdf.query.parser.sparql.ast.ASTQueryContainer.jjtAccept(ASTQueryContainer.java:21)
	at com.complexible.stardog.plan.parser.QueryParserImpl.parseQuery(QueryParserImpl.java:464)
	at com.complexible.stardog.plan.parser.QueryParserImpl.parseQuery(QueryParserImpl.java:444)
	at com.complexible.stardog.plan.PlanContext.planFor(PlanContext.java:87)
	at com.complexible.stardog.plan.eval.QueryEngine.getExecutablePlan(QueryEngine.java:239)
	at com.complexible.stardog.plan.eval.QueryEngine.executeGraph(QueryEngine.java:119)
	at com.complexible.stardog.query.DefaultQueryFactory$GraphQuery.execute(DefaultQueryFactory.java:208)
	at com.complexible.stardog.query.DefaultQueryFactory$GraphQuery.execute(DefaultQueryFactory.java:194)
	at com.complexible.stardog.api.KernelDatabaseConnection$KernelGraphQuery.execute(KernelDatabaseConnection.java:782)
	... 46 more
2

According to the spec for CONSTRUCT WHERE, only basic graph patterns are allowed, and "no FILTERs and no complex graph patterns are allowed in the short form." The OPTIONALs you are using count towards that, so this is really a matter of 5.0 implementing the spec better than 4.x did, it seems.

You'll either need to run the query without the OPTIONALs or rewrite the CONSTRUCT into a full construct { <whatever> } where { <whatever else> }

3

Ok, that’s fine then. Thanks.