ArcadeDB 26.1.1 Release Notes

We're excited to announce ArcadeDB 26.1.1, a significant release that brings 92 closed issues and introduces major new capabilities to the platform. This release marks a milestone with the introduction of a native OpenCypher query engine and substantial improvements to our Vector indexing capabilities.

🎯 Major New Features

Native OpenCypher Query Engine

The highlight of this release is the complete native Cypher query engine implementation (#3123), delivering the most important features of the OpenCypher graph query language. This native implementation provides:

• Full Cypher query support directly in ArcadeDB
• Optimized execution without external dependencies
• Seamless integration with existing multi-model capabilities
• Enhanced graph traversal and pattern matching capabilities

Modular Distribution Builder

Introduced a new modular distribution builder (#3194) that allows users to create custom ArcadeDB distributions with only the modules they need, reducing deployment size and complexity.

🚀 LSM Vector Index Enhancements

This release brings significant improvements to our vector indexing capabilities:

• Hierarchy Flag Support: Added configurable hierarchy flag to LSM vector index configuration (#3130) for optimized index structures
• Eager Vector Graph Rebuild API: New API for eager vector graph rebuilding (#3146), providing better control over index maintenance
• Product Quantization (PQ) Improvements:
  • Fixed PQ file path canonicalization (#3159)
  • Automatic migration of legacy PQ files
  • Enhanced file handling and reliability
• storeVectorsInGraph Consistency: Honor the storeVectorsInGraph flag when writing vecgraph (#3145)
• Improved Progress Logging: Enhanced graph build progress logging with fallback mechanisms and 2-second throttle (#3165) for better monitoring
• Chunk-size Warning Improvements: Ensure warnings display original values and maintain WAL settings (#3134)

🔧 Improvements & Bug Fixes

PostgreSQL Wire Protocol

• Fixed PostgreSQL type mapping (#3119) for improved compatibility

Studio Enhancements

• Upgraded to jQuery 4.0.0 (#3166) for modern browser support and security improvements
• Improved chart rendering tests and response handling (#3164)
• Fixed TypeError when importing JSON graph without settings property (#3100)
• Multiple UI library updates (ApexCharts, CodeMirror, pdfmake)

Core Engine

• Removed deprecated HNSW vector index support (#3095), consolidating on LSM-based implementation
• Updated Maven wrapper to version 3.9.12 (#3098)

Tools, Infrastructure & Build

• Fixed many issues on database importer (CSV, JSON and XML)
• Enhanced distribution builder with modular architecture
• Improved test coverage and reliability
• Code quality improvements and refactoring

📝 Full Changelog

Full Changelog: 25.12.1...26.1.1

Closed Issues: 92 issues resolved - see milestone 26.1.1 for details