Statistics for SPARQL algebra features in use

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

Statitics are collected over 1223 queries. Using 6.77 statement patterns per query.

Type	Count	Queries
Statement patterns	8276	1220
Filter	819	597
Optional	143	75
Property path	151	112
Service	129	104
Union	148	96
Minus	1	1
Exists	188	129
Group	175	165
Order	206	205
Aggregate	515	165
- Average	8	4
- Count	396	139
- GroupConcat	60	26
- Max	4	2
- Min	4	2
- Sample	33	10
- 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 patterns count as one constant.

	Count	Avg
Variables	16544	13.53
Constants	9189	7.51