Statistics for SPARQL algebra features in use

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

Statitics are collected over 1147 queries. Using 6.73 statement patterns per query.

Type	Count	Queries
Statement patterns	7719	1144
Filter	801	585
Optional	79	49
Property path	130	93
Service	128	103
Union	137	90
Minus	2	2
Exists	186	127
Group	145	137
Order	155	154
Aggregate	406	137
- Average	8	4
- Count	312	115
- 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	15383	13.41
Constants	8626	7.52