The Apache Calcite team is pleased to announce the release of Apache Calcite 1.28.0.
Calcite is a dynamic data management framework. Its cost-based optimizer converts queries, represented in relational algebra, into executable plans. Calcite supports many front-end languages and back-end data engines, and includes an SQL parser and, as a sub-project, the Avatica JDBC driver. This release comes four months after 1.27.0, contains contributions from 38 authors, and resolves 76 issues. New features include the UNIQUE sub-query predicate, the MODE aggregate function, the PERCENTILE_CONT and PERCENTILE_DISC inverse distribution functions, an Exasol dialect for the JDBC adapter, and improvements to materialized view recognition. You can start using it in Maven by simply updating your dependency to: <dependency> <groupId>org.apache.calcite</groupId> <artifactId>calcite-core</artifactId> <version>1.28.0</version> </dependency> If you'd like to download the source release, you can find it here: https://calcite.apache.org/downloads/ You can read more about the release (including release notes) here: https://calcite.apache.org/news/2021/10/19/release-1.28.0/ We welcome your help and feedback. For more information on how to report problems, and to get involved, visit the project website at: https://calcite.apache.org/ Thanks to everyone involved! Julian Hyde, on behalf of the Apache Calcite Team