🦖 A SQL-on-everything Query Engine you can execute over multiple databases and file formats. Query your data, where it lives.

The Lightning Catalog is an open-source data catalog designed for preparing data at any scale in ad-hoc analytics, data virtualization, data warehousing, lake houses, and ML projects.

HiBISCuS: Hypergraph-Based Source Selection for SPARQL Endpoint Federation

使用 shardingsphere 做 MySQL 的跨库JOIN（联邦查询）

Query Federation System for RDF Graphs