Introduction
GridGain 9.0 introduces new SQL engine based on the Apache Calcite framework to parse and optimize queries and generate execution plans. Previously, it was based on H2 Database.
Apache Calcite is a dynamic data management framework, which mainly serves for mediating between applications and one or more data storage locations and data processing engines. For more information on Apache Calcite, please see the product documentation.
Replacing H2 SQL engine with Apache Calcite incorporates the following general improvements:
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Wider SQL support: Apache Calcite, unlike H2, is specifically designed for SQL enablement on top of an arbitrary external data storage;
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Better optimization algorithms: Apache Calcite optimizes queries by repeatedly applying planner rules to a relational expression;
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Higher overall performance: Calcite offers much higher levels of execution flexibility, as well as higher efficiency in terms of both memory and CPU consumption.
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