What's Changed

We are pleased to announce our first Developer Preview release!

This release adds an initial implementation of aggregation pipelines. For now, only the $match and $count stages are implemented. Additional stages will be implemented in future releases.

This release also pushes more filtering queries to the backend, significantly improving their speed. Again, more will be implemented in future releases.

New Features 🎉

• Support $mul field update operator by @chilagrow in #1760
• Support $push array update operator by @rumyantseva in #1819
• Support PostgreSQL pushdowns for numbers by @noisersup in #1809
• Pushdown SQL queries with dot notation by @noisersup in #1864
• Initial support for aggregation pipelines by @AlekSi in #1860

Fixed Bugs 🐛

• Fix error types and array handling when dot notation is used with $set operator by @rumyantseva in #1795
• Fix $inc operator panics for non-existing array index by @chilagrow in #1787
• Fix $set operator to apply correct comparison by @chilagrow in #1814

Enhancements 🛠

• Set default pool_max_conns to 20 for PostgreSQL by @jkoenig134 in #1852

Documentation 📄

• Blog and documentation configuration improvements by @rumyantseva in #1799
• Fix internal links and images by @Fashander in #1796
• Bump ferretdb/docusaurus-docs from 2.2.0-2 to 2.2.0-3 in /build/deps by @dependabot in #1823
• Tweak documentation about flags by @AlekSi in #1820
• Add blog post about FerretDB v0.8.1 release by @Fashander in #1813
• Add blog post on FerretDB beta release 0.8.0 by @Fashander in #1815
• Add basic documentation writing guide by @AlekSi in #1826
• Update docker deployment documentation by @noisersup in #1817
• Reformat Markdown tables by @AlekSi in #1847
• Reformat blog and documentation setup by @Fashander in #1839
• Clarify what command statistics we gather by @AlekSi in #1861
• Add blog post on "How FerretDB fetches data (About query pushdown)" by @Fashander in #1853
• Add content creation process for documentation and blog by @Fashander in #1859
• Mention that there is no configuration file by @AlekSi in #1879
• Truncate blog post display by @Fashander in #1874

Other Changes 🤖

• Simplify types.Array Append signature by @w84thesun in #1793
• Integrate explain into tests by @noisersup in #1790
• Add package.txt stub by @AlekSi in #1806
• Remove lazy connection pools by @AlekSi in #1812
• Add Go execution tracing for tests by @AlekSi in #1804
• Retry transaction more times and log retries by @AlekSi in #1818
• Migrate to Tigris beta.27 by @rumyantseva in #1810
• Remove ListenerOpts from another ListenerOpts by @AlekSi in #1837
• Update CONTRIBUTING.md for test data tip by @chilagrow in #1832
• Tiny cleanups by @AlekSi in #1849
• Update development documentation by @AlekSi in #1851
• Make proper port visible on blog development server by @noisersup in #1862
• Ensure that we don't import extra dependencies by @AlekSi in #1856
• Extract handler errors into own package by @AlekSi in #1872
• Run query compat tests on same collection by @chilagrow in #1870
• Fix InTransaction helper's edge case by @AlekSi in #1881
• Improve insert in Tigris by using single query for multiple documents by @rumyantseva in #1871
• Unify reply code in handlers by @AlekSi in #1883
• Make iterator interface more strict by @AlekSi in #1882

New Contributors

• @jkoenig134 made their first contribution in #1852

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