On Mon, Mar 28, 2016 at 10:46 AM, Lorenz B. <[email protected]> wrote: > Hi Joshua, > > just what I know about Jena so far: > > if a Query object is created first, yes it's parsed and probably converted > into what you showed as being non-legal SPARQL. The parsing can be avoided > with QueryEngineHttp which sends the plain query string.
Yeah, that's the approach that Andy has mentioned before on an answers.semanticweb.com answer [2], and that's what I passed on to the Stack Overflow user. It's a really weird bug though, if that's what's actually happening. Unfortunately, the user said that he did ask on the Jena mailing list, and got the same response that I initially provide, "it looks like you've got a typo, are you **sure** that you're showing us the code that you're running?". (I think that's a completely reasonable response, especially with non-minimal examples, though.) I wonder if this has bitten anyone else in recent times? Joshua [2] http://answers.semanticweb.com/questions/19935/jena-throws-queryparsingexception-on-correct-but-non-standard-sparql > > Kind regards, > Lorenz > >> In a Stack Overflow question [1] a user seems to be running up against >> a syntax error when running a query from Java that they're not getting >> when they run the same query from a Fuseki web interface. Looking >> into it, there's something weird going on, and it shows up in >> sparql.org's query parser [2]. If you enter the query >> >> select (group_concat(distinct ?x) as ?y) (sum(distinct ?x) as ?z) {} >> >> into the parser, the formatted, parsed query appears as: >> >> SELECT (GROUP_CONCAT DISTINCT (?x) AS ?y) (SUM(DISTINCT ?x) AS ?z) >> WHERE {} >> >> which is *not* legal. (Note the off placement of distinct with the >> GROUP_CONCAT.) >> >> When a query is sent to a remote endpoint using Jena, does Jena first >> parse the input query, and then send the reformatted query off to the >> remote endpoint? That would explain the user's weird experience, but >> I'm not sure whether that's how things are implemented or not. >> >> Joshua >> >> >> [1] http://stackoverflow.com/q/36137483/1281433 >> [2] http://sparql.org/validate/query >> > -- > Lorenz Bühmann > AKSW group, University of Leipzig > Group: http://aksw.org - semantic web research center > -- Joshua Taylor, http://www.cs.rpi.edu/~tayloj/
