SPARQL: fix handling of filters with more than one variable or one variable in an unexpected position

quadstorejs / quadstore

A LevelDB-backed graph database for JS runtimes (Node.js, Deno, browsers, ...) supporting SPARQL queries and the RDF/JS interface.

https://github.com/quadstorejs/quadstore

MIT License

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Closed jacoscaz closed 4 years ago

jacoscaz commented 4 years ago

[x] While parsing SPARQL filters, ensure that resulting search filters always have the main variable as their first argument (changing filter type where needed such as > to <
[x] Add a check that ensure the first argument of a search filter is always a variable
[x] Prevent optimization of search filters with more than one variable in their arguments

jacoscaz commented 4 years ago

published in quadstore@7.0.1-alpha.6