Statistics for SPARQL algebra features in use

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

Statitics are collected over 1219 queries. Using 6.75 statement patterns per query.

Type	Count	Queries
Statement patterns	8228	1216
Filter	816	595
Optional	142	74
Property path	149	112
Service	129	104
Union	140	92
Minus	2	2
Exists	187	128
Group	171	161
Order	203	202
Aggregate	502	161
- Average	8	4
- Count	388	136
- GroupConcat	58	25
- Max	4	2
- Min	4	2
- Sample	30	9
- 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	16455	13.5
Constants	9141	7.5