Statistics for SPARQL algebra features in use

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

Statitics are collected over 1221 queries. Using 6.76 statement patterns per query.

Type	Count	Queries
Statement patterns	8257	1218
Filter	817	596
Optional	142	74
Property path	149	112
Service	129	104
Union	145	94
Minus	2	2
Exists	187	128
Group	174	164
Order	205	204
Aggregate	513	164
- Average	8	4
- Count	394	138
- 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	16509	13.52
Constants	9168	7.51