Referencing the text from documentation: “ StoneDB is optimized for OLAP applications. StoneDB that runs on a common server can process complex queries on tens of billions of data records, while ensuring high performance. Compared to databases that use MySQL Community Edition, StoneDB is at least 10 times faster in processing queries.

StoneDB uses the knowledge grid technology and a column-based storage engine.”

That doesn’t seem like a HTAP database but an analytical database. Transaction processing has completely different requirements which cannot be fulfilled by a columnar storage engine.