Calcite

Starting the 2.13 version, Apache Ignite includes a new SQL engine based on the Apache Calcite framework.

Apache Calcite is a dynamic data management framework, which mainly serves for mediating between applications, one or more data storage locations, and data processing engines. For more information on Apache Calcite, please see the product documentation.

The current H2-based SQL engine has a number of fundamental limitations of query execution in a distributed environment. To address these limitations, a new SQL engine was implemented. The new engine uses tools provided by Apache Calcite for parsing and planning queries. It also has a new query execution flow.