Now there is marketing of calling some of that "NewSQL"
NewSQL - Wikipedia
"NewSQL is a class of modern relational database management systems that seek to provide the same scalable performance of NoSQL systems for online transaction processing (OLTP) read-write workloads while still maintaining the ACID guarantees of a traditional database system."
NoSQL vs. NewSQL: Choosing the Right Tool - VoltDB
Whitepaper: SQL vs NoSQL vs NewSQL - VoltDB
In-Memory Database | VoltDB
Founder: Dr. Michael Stonebraker - VoltDB
The experience of this founder is a huge plus when considering the database!
Among many other things, he is also creator of Postgres database.
Michael Stonebraker - Wikipedia
SQL vs. NoSQL vs. NewSQL: Finding the Right Solution - Dataconomy