Hannah Bast
The following (admittedly strange) query triggers the error message in the subject line: ``` PREFIX rdfs: SELECT * WHERE { SERVICE { ?person @en@rdfs:label ?label } } ``` https://qlever.cs.uni-freiburg.de/wikidata/j9iwvR
On QLever's OSM instance, most queries involve a join with the `geo:hasGeometry` predicate on the subject, which is why the index scan for that predicate ordered by subject is pinned...
The following query erroneously leaves the `?name` column with only null entries: https://qlever.cs.uni-freiburg.de/osm-germany/I6xSen When adding `GROUP BY`, there is an error message `absl::container_internal::raw_hash_map::at`: https://qlever.cs.uni-freiburg.de/osm-germany/AK9VWK Conjecture: something with the `absl` hash...
For the following query on Wikidata, the last column is not shows and the log says "The variable "?coordinates" was found in the original query, but not in the execution...
There are currently four different osm2rdf-specific prefixes, namely: ``` @prefix osm2rdf: . @prefix osm2rdfkey: . @prefix osm2rdfgeom: . @prefix osm2rdfmember: . ``` [Try it on Qlever](https://qlever.cs.uni-freiburg.de/osm-planet/yX7TzI) Is this useful or...
@lehmann-4178656ch @patrickbr The last three example queries on https://wiki.openstreetmap.org/wiki/SPARQL_vs_Overpass_QL_examples involve timestamp information. Is this information contained in the PBF files (at least in `planet-latest.osm.obf`)? If yes, I would suggest adding...
This workflow performs the following end-to-end test using the Docker setup: 1. Check out the code 2. Build a Docker image using the `Dockerfile` provided by the code 3. Download...
Compiling the current master on Ubuntu 22.04 produces many warnings. Its' good practice to fix them, in particular, to make sure that the latest compiler version runs through without error....
Continuing a discussion here started with @bradenmacdonald on https://github.com/ad-freiburg/qlever/pull/992 (the content of which was not directly related to this discussion, but just triggered it)
Dear authors, I stumbled upon your paper last Friday and read it over the weekend. Here are some comments and questions: 1. We have also developed an open-source engine for...