Thanks Lorenz and James for the feedback and clarification. The paper I am talking about is https://www.semantic-web-journal.net/system/files/swj3336.pdf
Best Regards, Hashim On Thu, Sep 21, 2023 at 8:21 AM Lorenz Buehmann < buehm...@informatik.uni-leipzig.de> wrote: > @Hashim in the future you should reply to the mailing list such that all > people can see your response and follow the thread. Now we can just see > your answer because James replied to you and the mailing list. We also > can't see your attachment. > > Which paper are you talking about? > > As James said, there is a difference between a syntax tree like the Jena > algebra tree does (without optimizations) and a query execution plan > (with optimizations). > > > Regarding LSQ, given that you're working at DICE group, I'd suggest to > have a look at it or simply talk to Saleem. But it does only extract the > "simple" features based on the syntax tree and makes it accessible as > RDF data itself. > > Lorenz > > On 20.09.23 23:05, James Anderson wrote: > > good evening; > > > > if you want to reproduce those results, you will have to examine the > parsed syntax tree. > > that should comprise just two bgps, as that is the immediate syntax. > > if, on the other hand, you examaine the results of a query planner, you > are not looking at a systax tree, you are looking at the query processor's > prospective exection plan. > > execution model permits the transformations to which i alluded. > > you will more likely get your desired representation by having jena emit > an sse, rather than an execution plan. > > > > best regards, from berlin, > > > >> On 20. Sep 2023, at 17:48, Hashim Khan <engr.hashimwa...@gmail.com> > wrote: > >> > >> Thanks for the quick reply. > >> > >> To be precise, I want to clarify the table on page 7 of the attached > paper. Here, the No. of BGPs is 2, and also some more values. I want to > extract all the info using Jena. But I could not till now. About the LSQ, I > will check it, but I am following this paper and want to reproduce the > results. > >> > >> Best Regards, > >> Hashim > >> > >> On Tue, Sep 19, 2023 at 4:18 PM James Anderson < > anderson.james.1...@gmail.com> wrote: > >> good afternoon; > >> > >> you have to consider that a query processor is free to consolidate > statement patterns in a nominal bgp - which itself implicitly joins them, > or separate them in order to either apply a different join strategy or - as > in this case, to interleave an operation under the suspicion that it will > reduce solution set cardinality. > >> > >> best regards, from berlin, > >> > >>> On 19. Sep 2023, at 13:20, Hashim Khan <engr.hashimwa...@gmail.com> > wrote: > >>> > >>> Hi, > >>> > >>> Having a look on this SPARQL query: > >>> > --------------------------------------------------------------------------- > >>> prefix dbo:<http://dbpedia.org/ontology/> > >>> prefix dbr:<http://dbpedia.org/resource/> > >>> prefix foaf:<http://xmlns.com/foaf/0.1/> > >>> > >>> SELECT DISTINCT ?name ?birth ?death > >>> WHERE { ?person dbo:birthPlace dbr:Berlin . > >>> ?person dbo:birthDate ?birth . > >>> ?person foaf:name ?name . > >>> OPTIONAL { ?person dbo:deathDate ?death . } > >>> FILTER (?birth < "1900-01-01") . > >>> } > >>> LIMIT 100 > >>> > ----------------------------------------------------------------------------- > >>> Using Apache Jena ARQ command, ./arq --query exampleQuery.sparql > --explain > >>> I got this result. > >>> > >>> 13:11:41 INFO exec :: ALGEBRA > >>> (slice _ 100 > >>> (distinct > >>> (project (?name ?birth ?death) > >>> (conditional > >>> (sequence > >>> (filter (< ?birth "1900-01-01") > >>> (bgp > >>> (triple ?person < > http://dbpedia.org/ontology/birthPlace> < > >>> http://dbpedia.org/resource/Berlin>) > >>> (triple ?person <http://dbpedia.org/ontology/birthDate > > > >>> ?birth) > >>> )) > >>> (bgp (triple ?person <http://xmlns.com/foaf/0.1/name> > ?name))) > >>> (bgp (triple ?person <http://dbpedia.org/ontology/deathDate> > >>> ?death)))))) > >>> 13:11:41 INFO exec :: BGP > >>> ?person <http://dbpedia.org/ontology/birthPlace> < > >>> http://dbpedia.org/resource/Berlin> > >>> ?person <http://dbpedia.org/ontology/birthDate> ?birth > >>> 13:11:41 INFO exec :: Reorder/generic > >>> ?person <http://dbpedia.org/ontology/birthPlace> < > >>> http://dbpedia.org/resource/Berlin> > >>> ?person <http://dbpedia.org/ontology/birthDate> ?birth > >>> 13:11:41 INFO exec :: BGP :: ?person < > >>> http://xmlns.com/foaf/0.1/name> ?name > >>> ------------------------ > >>> | name | birth | death | > >>> ======================== > >>> ------------------------ I have a question about the Basic Graph > Patterns. > >>> I think, in this query there are two BGPs. But here i shows 3. Can > anyone > >>> explain it to me? Also, I want to know, the number of joins, no of > >>> projection variables, number of left joins, depth, and such other > relevant > >>> info about the query features. How can I get all at one place? > >>> > >>> Best Regards, > >>> > >>> > >>> *Hashim Khan* > >> --- > >> james anderson | ja...@dydra.com | https://dydra.com > >> > >> > >> > >> > >> -- > >> Hashim Khan > >> > >> <swj3336.pdf> > > --- > > james anderson | ja...@dydra.com | https://dydra.com > > > > > > > -- > Lorenz Bühmann > Research Associate/Scientific Developer > > Email buehm...@infai.org > > Institute for Applied Informatics e.V. (InfAI) | Goerdelerring 9 | 04109 > Leipzig | Germany > > -- *Hashim Khan*
