Statistics for SPARQL algebra features in use

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

Statitics are collected over 1198 queries. Using 6.65 statement patterns per query.

Type	Count	Queries
Statement patterns	7965	1195
Filter	795	579
Optional	138	72
Property path	144	109
Service	121	98
Union	148	96
Minus	1	1
Exists	188	129
Group	177	167
Order	202	201
Aggregate	519	167
- Average	8	4
- Count	400	141
- 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	16011	13.36
Constants	8868	7.4