Statistics for SPARQL algebra features in use

Some basic statisics on SPARQL algebra features, as determined after parsing with RDF4j.

Statitics are collected over 1137 queries. Using 6.63 statement patterns per query.

Type	Count	Queries
Statement patterns	7539	1134
Filter	794	579
Optional	72	44
Property path	121	88
Service	118	95
Union	133	87
Minus	2	2
Exists	186	127
Group	144	136
Order	155	154
Aggregate	404	136
- Average	8	4
- Count	310	114
- GroupConcat	46	20
- Max	4	2
- Min	4	2
- Sample	22	8
- Sum	10	3

Note describe queries may have zero statement patterns.

Statistics for SPARQL variables and constants

This is distinct constants and variables. Two uses of the same IRI predicate in multiple triple paterns count as one constant.

	Count	Avg
Variables	15095	13.28
Constants	8462	7.44