Apache Calcite

Apache Calcite is a dynamic data management framework.

It contains many of the pieces that comprise a typical
database management system but omits the storage primitives.
It provides an industry standard SQL parser and validator,
a customisable optimizer with pluggable rules and cost functions,
logical and physical algebraic operators, various transformation
algorithms from SQL to algebra (and the opposite), and many
adapters for executing SQL queries over Cassandra, Druid,
Elasticsearch, MongoDB, Kafka, and others, with minimal
configuration.

For more details, see the home page.