Query error: Could not determine operation type

[dpriskorn]

#title:Number of main subjects inferred from titles 
SELECT (count(?item) as ?c)
WHERE 
{
  ?item p:P921 [ prov:wasDerivedFrom [ pr:P887 wd:Q69652283 ] ].
}

https://qlever.cs.uni-freiburg.de/wikidata/BoJJyB

[ktk]

Remove the comment in the query, that seems to trigger this bug. Funnily enough I ran into it as well just a few hours ago. I tried reproducing it but I can't reproduce it always. Seems to be a problem with the SPARQL parser when a # is before the SELECT. @hannahbast .

[ahankinson]

Same here. Looks like it's this function:

https://github.com/ad-freiburg/qlever-ui/blob/master/backend/static/js/qleverUI.js#L519-L569

Seems an odd way of calculating the operation type, simply by looking at the first word of a query... @Qup42 any chance you could revisit this?

FWIW, some of my queries trigger this, and some don't. I'm working on trying to narrow down what triggers it.

[ahankinson]

For my queries, this regex:

.replace(/PREFIX\s+\w+:\s+<[^<]*>\s*/gi, "")

Wasn't sufficient as it was not behaving correctly with all of my queries. ChatGPT suggests taking into account line endings, e.g.,

.replace(/PREFIX\s+\w+:\s+<[^<]*>\s*\r?\n/gi, "")

[hannahbast]

See #138, will be fixed asap