Apache Trafodion (http://trafodion.incubator.apache.org) is a webscale SQL-on-Hadoop solution enabling transactional or operational workloads on Hadoop. Trafodion builds on the scalability, elasticity, and flexibility of Hadoop. Trafodion extends Hadoop to provide guaranteed transactional integrity, enabling new kinds of big data applications to run on Hadoop. With the rise of Big Data, it would be good for Hibernate to support such a highly scalable RDBMS on Hadoop.
Esgyn Corp, the main contributor of Apache Trafodion, is willing to will maintain the Trafodion dialect in Hibernate for long term.
Hibernate v5.0 and Apache Trafodion