Changelog

All notable changes to DBX will be documented here.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

[0.0.4-beta] - 2026-02-15

First feature release. Full query execution pipeline optimization.

New Features

  • Query Plan Cache — Two-tier (memory + disk) cache that skips parsing and optimization for repeated SQL queries
  • Parallel Query Execution — Rayon thread pool-based parallel filtering, aggregation, and projection for large datasets
  • WAL Partitioning — Per-table WAL partitions to eliminate write bottlenecks
  • Schema Versioning — Zero-downtime DDL support with schema change history and per-version rollback
  • Index Versioning — Index rebuild history tracking with performance metrics
  • Feature Flags — Runtime toggle system for individual features (supports environment variables and file persistence)
  • UDF Framework — User-defined functions (scalar, aggregate, table), triggers, and schedulers
  • Benchmark Framework — Criterion-based performance measurement with before/after comparison tools
  • PTX Persistent Kernel — NVRTC-based runtime CUDA kernel compilation for persistent GPU processing (optional, behind gpu feature)
  • Hash/Range Sharding — GPU shard strategies: hash-based (ahash) and range-based row distribution
  • CUDA Stream Management — Separate stream creation via fork_default_stream()
  • Schema-based INSERT Serialization — Column-named JSON object serialization when table schema is available
  • JOIN Optimization — Size-based build/probe table swap for INNER JOIN (smaller table as build)
  • Tombstone Deletion — Versioned tombstone support in columnar delta storage
  • Table-specific Cache Invalidation — Selective eviction by table name instead of full cache clear

Performance Improvements

Metric Before After Improvement
Repeated SQL parsing (10x) 146 µs 20 µs 7.3x
WAL append (100 entries) 1,016 µs 71 µs 14.2x
Schema lookup (single-thread) 86 ns 46 ns 47%
Schema lookup (8 threads) 7.4M ops/s 18.1M ops/s 2.44x
Small aggregation (150 rows) 32.5 µs 991 ns 33x

Refactored

  • SQL Optimizer — Split 874-line monolithic optimizer.rs into modular directory structure (6 files: trait, 4 rules, tests)
  • CREATE FUNCTION — Actual parameter parsing from parenthesized arguments
  • ORDER BY — Activated test for sqlparser 0.52 OrderBy.exprs API

Internal Changes

  • Migrated SchemaVersionManager storage from RwLock<HashMap> to DashMap for improved concurrent read performance
  • Changed ParallelQueryExecutor parallelization criteria from batch count to total row count (defaults to sequential execution below 1,000 rows)
  • Applied dynamic threading and automatic batch size tuning to the SQL parser
  • Documented cudarc 0.19.2 limitations for Unified Memory, P2P detection, and persistent kernels

Dependencies

  • Added dashmap 6.x (lock-free concurrent hashmap)
  • Added rayon 1.x (parallel processing)
  • Added criterion 0.5 (benchmarking)

[0.0.3-beta] - 2026-02-15

Added

  • Comprehensive usage guides for Python, Node.js, and .NET packages
    • JSON data handling examples
    • Batch operations and error handling
    • Real-world examples (KV Store, Session Manager, Cache Wrapper)
    • TypeScript support for Node.js
    • ASP.NET Core integration examples
  • Bilingual documentation (English + Korean) for all language bindings

Changed

  • Platform Support: Corrected to Windows x64 only (Linux/macOS planned)
  • Cargo.toml: homepage now points to GitHub Pages instead of bytelogic.studio
  • crates.io: Only dbx-core is published (removed dbx-derive and dbx-ffi)
  • Documentation: Removed Derive Macro section (not used in production)
  • Doc Comments: Converted Rust doc comments to English for docs.rs consistency

Fixed

  • Over-claimed platform support (was: all platforms, now: Windows x64 only)
  • Version inconsistencies across packages

[0.0.2-beta] - 2026-02-15

Added

  • Package documentation for all language bindings (Rust, .NET, Python, Node.js, C/C++)
  • GitHub Pages bilingual docs (English + Korean) for each package
  • CHANGELOG.md
  • NuGet package metadata (version, license, readme)
  • readme field in all Rust crate Cargo.toml files
  • permissions: contents: write for GitHub Release workflow

Changed

  • CI/CD: Split monolithic release workflow into independent per-registry workflows
    • publish-crates.yml — crates.io (dbx-derive → dbx-core → dbx-ffi)
    • publish-nuget.yml — NuGet
    • publish-pypi.yml — PyPI
    • publish-npm.yml — npm
    • release.yml — Build + Test + GitHub Release only
  • Versions: Unified all packages to 0.0.2-beta
  • License: Simplified to MIT for crates.io compatibility
  • Workspace metadata: Added repository, homepage, documentation inheritance
  • crates.io: Removed || true from publish commands, added --no-verify, increased index wait to 60s

Fixed

  • NuGet 403 error: API key permission guidance
  • PyPI 400 error: Version format corrected to PEP 440 (0.0.2b0)
  • npm EOTP error: Granular Access Token guidance for 2FA bypass
  • crates.io circular dependency: Removed version from dbx-derive dev-dependency
  • GitHub Release 403: Added contents: write permission
  • edition = "2024" preserved for let chains syntax support

[0.0.1-beta] - 2026-02-12

Added

  • Initial release
  • 5-Tier Hybrid Storage engine (WOS → L0 → L1 → L2 → Cold)
  • MVCC transaction support with snapshot isolation
  • SQL engine (CREATE TABLE, INSERT, SELECT, UPDATE, DELETE)
  • Write-Ahead Logging (WAL) for crash recovery
  • Language bindings: Rust, C#/.NET, Python, Node.js, C/C++
  • Encryption support (AES-GCM-SIV, ChaCha20-Poly1305)
  • Arrow/Parquet native columnar format
  • GitHub Pages documentation site
  • CI/CD pipeline with GitHub Actions
  • Comparison benchmarks vs SQLite, Sled, Redb

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