> How about an RDBMS that exposes a relational algebra api MonetDB does this, though rather low-level: http://monetdb.cwi.nl/projects/monetdb/MonetDB/Document

> How about an RDBMS that exposes a relational algebra api MonetDB does this, though rather low-level: http://monetdb.cwi.nl/projects/monetdb/MonetDB/Documentation/MAL-Reference.html http://monetdb.cwi.nl/projects/monetdb/MonetDB/Documentation...