feat: extend SPARQL evaluator with comprehensive function and operator support#945
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…r support Add 30+ SPARQL 1.1 built-in functions and the MINUS algebra operator to the custom SPARQL query backend. String functions: - SUBSTR (2-arg and 3-arg forms), STRBEFORE, STRAFTER - REPLACE (regex with flags), ENCODE_FOR_URI Numeric functions: - FLOOR, CEIL, ROUND, ABS Date/time accessors: - YEAR, MONTH, DAY, HOURS, MINUTES, SECONDS - NOW, TZ Hash functions: - MD5, SHA1, SHA256, SHA512 Term constructors: - IRI/URI, BNODE, UUID, STRUUID Other functions: - LANGMATCHES, RAND - EXISTS / NOT EXISTS (with async pre-evaluation to bridge the sync expression evaluator and async algebra evaluator) Algebra: - MINUS set-difference operator - HAVING already works via rdflib's Filter mapping (verified) Fix SPARQL ORDER handling Includes 653 lines of new unit tests covering all added functionality across expressions, solutions, and algebra layers.
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Add 30+ SPARQL 1.1 built-in functions and the MINUS algebra operator to the custom SPARQL query backend.
String functions:
Numeric functions:
Date/time accessors:
Hash functions:
Term constructors:
Other functions:
Algebra:
Fix SPARQL ORDER handling
Includes 653 lines of new unit tests covering all added functionality across expressions, solutions, and algebra layers.