Olaf Hartig

icon indicating a website link http://olafhartig.de icon indicating an email [email protected]

icon company Linköpings universitet icon location Linköping, Sweden icon location Senior Associate Professor in Computer Science at Linköping University, Amazon Scholar, research on database topics related to Web data and graph data

Results 33 comments of Olaf Hartig

Transitive path like `wdt:P279*` has slow and ugly query plan

> See https://github.com/w3c/sparql-query/issues/313 > > It appears that the QLever behaviour diverges from the SPARQL spec here. Indeed! @hannahbast if you have an efficient way to do (constant , pp+,...

Transitive path like `wdt:P279*` has slow and ugly query plan

@hannahbast No, [such a generalization](https://github.com/ad-freiburg/qlever/issues/2503#issuecomment-3553992030) is not true. `?x pp* const` and `?x pp* ?y` behave differently as I just detailed in [my reply in the other issue](https://github.com/w3c/sparql-query/issues/313#issuecomment-3554749171). And that...

CDT: Literals can have the same lexical form but different values.

Blank nodes in CDT literals have been the biggest challenge when we worked on the CDT spec. The behavior that you observe in your code snippet is indeed the expected...