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Apache Calcite

Developer(s)	Apache Software Foundation
Initial release	June 27, 2014; 10 years ago (2014-06-27)^[1]

Stable release	1.37.0 (May 6, 2024; 12 months ago (2024-05-06)^[2]) [±]

Repository	Calcite Repository
Written in	Java
Operating system	Cross-platform
Platform	Java
Type	SQL database framework
License	Apache License 2.0
Website	calcite.apache.org

Apache Calcite is an open source framework for building databases and data management systems. It includes a SQL parser, an API for building expressions in relational algebra, and a query planning engine. As a framework, Calcite does not store its own data or metadata, but instead allows external data and metadata to be accessed by means of plug-ins.

Several other Apache projects use Calcite.^[3] Hive uses Calcite for cost-based query optimization;^[4] Drill and Kylin use Calcite for SQL parsing and optimization; Samza and Storm use Calcite for streaming SQL. As of August 2016^[update], Apex, Phoenix and Flink have projects under development that use Calcite.

References

^ Julian Hyde. "Optiq-0.8 release announcement". Apache Software Foundation.
^ "Downloads". calcite.apache.org. Apache Software Foundation. Retrieved 2024-05-14.
^ "Powered by Calcite". Apache Software Foundation.
^ Julian Hyde. "Cost-based query optimization in Apache Hive 0.14", Hortonworks, 24 September 2014.

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