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Table 1 Overview of existing SPARQL query federation engines

From: SAFE: SPARQL Federation over RDF Data Cubes with Access Control

Systems

Source selection

Join type

Code

Policy

Cache

Update

ADERIS [27]

Index

Nested loop

✓

✗

✗

✗

ANAPSID [26]

Query & index

Adaptive

✓

✗

✗

✓

Avalanche [24]

Query & index

Distributed, merge

✗

✗

✓

✗

DARQ [4]

Index

Nested loop, bind

✓

✗

✗

✗

DAW [25]

Query & index

Based on underlying system

✗

✗

✓

✗

FedSearch [3]

Query & index

Bind, pull-based rank

✗

✗

✓

✗

FedX [1]

Query

Nested loop, bind

✓

✗

✓

✗

LHD [5]

Query & index

Hash, bind

✓

✗

✗

✗

SPLENDID [2]

Query & index

Hash, bind

✓

✗

✗

✗

HiBISCuS [14]

Query & index

Nested loop, bind

✓

✗

✓

✓

FEDRA [6]

Query & index

Nested loop, bind

✓

✗

✓

✓

SAFE [15]

Query & index

Nested loop, bind

✓

✓

✓

✓