OLake (v0.4.0 - v0.4.2)

February 21, 2026 – March 5, 2026

🎯 What's New

Sources

1. Column selection -
   Added column-level selection for streams to allow users to select specific columns to sync, with a sync_new_columns parameter to control whether newly added source columns are auto-included.

🔧 Bug Fixes & Stability

1. MySQL UNSIGNED integer overflow fix -
   Fixed CDC values for large MySQL UNSIGNED columns by reinterpreting signed integers from the binlog parser as the correct unsigned type before processing, preventing overflow/negative outputs.

2. Chunk-scan query performance improvement -
   Replaced tuple-based range predicates with explicit lexicographic predicates and moved the logic into a shared builder, improving MySQL chunk-scan plans and performance. ​

3. MSSQL uniqueidentifier chunk + CDC capture-instance stability -
   Normalized uniqueidentifier (GUID) byte values for consistent chunk split/scan boundaries, and added optional manage_capture_instances to manage CDC capture instances during schema evolution.