Thanks for your answer. I¹m implementing a read-only system, so I may just need to implement its graphBaseFind method. But one more question, when I look into parameter of graphBaseFind, it only provide TripleMatch, where does this TripleMatch come from? Is it represented for one statement of SPARQL query?
On 4/3/14, 2:28 PM, "Claude Warren" <[email protected]> wrote: >I'm not familiar with HBase and it's query capability, so I am going to >assume that it has a query language that works something like SQL and go >with the standard answer: >extend GraphBase (com.hp.hpl.jena.graph.impl.GraphBase) as a starting >point. > >It is not the algebra but it will present the HBase data as a graph and it >will plug into the query engine and a number of other components. > >Claude > > >On Thu, Apr 3, 2014 at 6:12 PM, Shijie Jin -X (shijjin - AAP3 INC at >Cisco) ><[email protected]> wrote: > >> Hi All: >> >> I¹m trying to extend the ARQ execution so it can convert SPARQL query to >> Hbase ³scan" operation. But after reading the document( >> http://jena.sourceforge.net/ARQ/arq-query-eval.html) and >> example(src-examples/arq.examples.engine.MyQueryEngine), I still can¹t >> figure out where should I write my code to turn the SPARQL query (or >>SPARQL >> algebra) into Hbase query. >> >> And I¹v also read the source code of D2RQ, but it uses the old version >> Jena framework which has a lot of difference compare to the latest >>version. >> >> So anyone can give me some hints how to extend the ARQ execution >> correctly? Is there any good document or source code that I should look >> into? >> >> Thank you, >> Shijie >> > > > >-- >I like: Like Like - The likeliest place on the >web<http://like-like.xenei.com> >LinkedIn: http://www.linkedin.com/in/claudewarren
