| Apache Calcite | |
| Developer: | Apache Software Foundation |
| Released: | [1] |
| Operating System: | Cross-platform |
| Programming Language: | Java |
| Genre: | SQL database |
| License: | Apache License 2.0 |
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.[2] Hive uses Calcite for cost-based query optimization;[3] Drill and Kylin use Calcite for SQL parsing and optimization;Samza and Storm use Calcite for streaming SQL., Apex, Phoenix and Flink have projects under development that use Calcite.