Definitely they should include D4M and GraphQL [1],[2]. Not only D4M can cater for structured relational data, it's also suitable for non-structured and sparse

Definitely they should include D4M and GraphQL [1],[2]. Not only D4M can cater for structured relational data, it's also suitable for non-structured and sparse data in spreadsheet, matrices and graph. It's essentially a generalization of SQL but for all things data. There's also integration of D4M with SciDB [3]. [1] D4M: Dynamic Distributed Dimensional Data Model: https://d4m.mit.edu/ https://d4m.mit.edu/ [2] GraphQL: https://graphql.org/ https://graphql.org/ [3] D4M: Bringing associative arrays to database engines: https://arxiv.org/abs/1508.07371 https://arxiv.org/abs/1508.07371