No I did not file a specific defect yet, please feel free to log a JIRA bug if you wish
Rob On 4/23/13 1:37 PM, "John Liu" <[email protected]> wrote: >Thanks, Rob for your quick reponse. > >Is there a defect number that I can track this bug? > >Thanks, John > > >________________________________ > From: Rob Vesse <[email protected]> >To: "[email protected]" <[email protected]>; John Liu ><[email protected]> >Sent: Tuesday, April 23, 2013 4:13:51 PM >Subject: Re: problem in rewriting query by AlgebraGenerator > > >It's a bug in how OpAsQuery converts sub-queries, watch this space for a >fix > >Rob > > >On 4/23/13 12:35 PM, "John Liu" <[email protected]> wrote: > >>oh I see, thanks Rob. >> >>I paste the class here, you will see the exception error when you run the >>code. >> import >>com.hp.hpl.jena.query.Query;import >>com.hp.hpl.jena.query.QueryFactory;import >>com.hp.hpl.jena.sparql.algebra.AlgebraGenerator;import >>com.hp.hpl.jena.sparql.algebra.Op;import >>com.hp.hpl.jena.sparql.algebra.OpAsQuery;public >>classTestJena { >>/*** >>@paramargs*/ >>publicstaticvoidmain(String[] args) {String queryString = >>"PREFIX dcterms: <http://purl.org/dc/terms/> \n"+ >>"PREFIX dbpedia: <http://dbpedia.org/resource/> \n"+ >>"SELECT ?num_of_holidays ?celebrate_Chinese_New_Year WHERE { \n"+ >>"{"+ >>"SELECT ?country_cat (COUNT(?holiday) as ?num_of_holidays) \n"+ >>"WHERE {"+ >>"?country_cat <http://www.w3.org/2004/02/skos/core#broader> >><http://dbpedia.org/resource/Category:Public_holidays_by_country>. \n"+ >>"?holiday dcterms:subject ?country_cat \n"+ >>"}GROUP by ?country_cat \n"+ >>"} \n"+ >>"{ \n"+ >>"SELECT ?country_cat (COUNT(?holiday) as ?celebrate_Chinese_New_Year) >>\n"+ >>"WHERE { \n"+ >>"?country_cat <http://www.w3.org/2004/02/skos/core#broader> >><http://dbpedia.org/resource/Category:Public_holidays_by_country>. \n"+ >>"?holiday dcterms:subject ?country_cat \n"+ >>"FILTER(?holiday=\"http://dbpedia.org/resource/Lunar_New_Year/'s_Day/") >>\n"+ >>"}GROUP by ?country_cat \n"+ >>"} \n"+ >>"}\n";System. >>out.println("Original query: \n"+ queryString);Query query = >>QueryFactory.create(queryString); >>AlgebraGenerator ag = >>newAlgebraGenerator();Op op = ag.compile(query); >>Query query2 = OpAsQuery.asQuery(op); >>String queryString2 = query2.toString(); >>System. >>out.println("Update query: \n"+ queryString2);Query newQuery2 = >>QueryFactory.create(queryString2); >>} >>} >> >> >>________________________________ >> From: Rob Vesse <[email protected]> >>To: "[email protected]" <[email protected]> >>Sent: Tuesday, April 23, 2013 2:06:34 PM >>Subject: Re: problem in rewriting query by AlgebraGenerator >> >> >>John >> >>Apache list strips attachments, if you have a code sample please just >>paste it into the email or provide a link to a pastebin/similar site with >>your code sample >> >>Rob >> >> >>On 4/23/13 11:02 AM, "John Liu" <[email protected]> wrote: >> >>>Thanks Andy for your quick reply. >>> >>>I tested Jena 2.10.1 and the problem still exists. Could you please run >>>the attached java code to see if it is a defect? >>> >>>Thanks, John >>> >>> >>>________________________________ >>> From: Andy Seaborne <[email protected]> >>>To: [email protected] >>>Sent: Tuesday, April 23, 2013 10:46:25 AM >>>Subject: Re: problem in rewriting query by AlgebraGenerator >>> >>> >>>On 23/04/13 03:10, John Liu wrote: >>>> Hello, >>>> I found a problem when rewriting a query by AlgebraGenerator, the >>>> generated query becomes syntax incorrect query. Can you please advise >>>>if >>>> this is a defect? Thanks. >>>> The version of JENA I tested is 2.7.1 >>> >>>There have been various improvements and fixes in this area which you'll >>>find in Jena 2.10.0 and in the active development system 2.10.1-SNAPSHOT >>>(from the Apache snapshot maven repository) >>> >>> Andy >>> >>>> The code I rewrite the query is: >>>> Query query = QueryFactory./create/(queryString); >>>> AlgebraGenerator ag = >>>> *new*AlgebraGenerator(); >>>> Op op = ag.compile(query); >>>> Query query2 = OpAsQuery./asQuery/(op); >>>> The original query is: >>>> PREFIX dcterms: <http://purl.org/dc/terms/> >>>> PREFIX dbpedia: <http://dbpedia.org/resource/> >>>> SELECT ?num_of_holidays ?celebrate_Chinese_New_Year WHERE { >>>> {SELECT ?country_cat (COUNT(?holiday) as ?num_of_holidays) >>>> WHERE {?country_cat <http://www.w3.org/2004/02/skos/core#broader> >>>> <http://dbpedia.org/resource/Category:Public_holidays_by_country>. >>>> ?holiday dcterms:subject ?country_cat >>>> }GROUP by ?country_cat >>>> } >>>> { >>>> SELECT ?country_cat (COUNT(?holiday) as ?celebrate_Chinese_New_Year) >>>> WHERE { >>>> ?country_cat <http://www.w3.org/2004/02/skos/core#broader> >>>> <http://dbpedia.org/resource/Category:Public_holidays_by_country>. >>>> ?holiday dcterms:subject ?country_cat >>>> FILTER(?holiday="http://dbpedia.org/resource/Lunar_New_Year's_Day") >>>> }GROUP by ?country_cat >>>> } >>>> } >>>> The generated query is: >>>> SELECT ?country_cat ?celebrate_Chinese_New_Year >>>> WHERE >>>> { { ?country_cat <http://www.w3.org/2004/02/skos/core#broader> >>>> <http://dbpedia.org/resource/Category:Public_holidays_by_country> . >>>> ?holiday <http://purl.org/dc/terms/subject> ?country_cat >>>> BIND(count(?holiday) AS ?num_of_holidays) >>>> } >>>> { ?country_cat <http://www.w3.org/2004/02/skos/core#broader> >>>> <http://dbpedia.org/resource/Category:Public_holidays_by_country> . >>>> ?holiday <http://purl.org/dc/terms/subject> ?country_cat >>>> FILTER ( ?holiday = "http://dbpedia.org/resource/Lunar_New_Year's_Day" >>>>) >>>> BIND(count(?holiday) AS ?celebrate_Chinese_New_Year) >>>> } >>>> } >>>> GROUP BY ?country_cat >>>> The generated query has a syntax error: "Line 5, column 12: Aggregate >>>> expression not legal at this point". >>>> Attached is a hava program to demonstrate the problem,
