OLake (v0.3.9 - v0.3.11)

December 29, 2025 – January 5, 2026

🎯 What's New

Platform Features

1. Spark + Iceberg playground setup -
   Added a Spark and Iceberg playground with a Jupyter notebook, full Docker Compose setup, and configuration/docs so users can quickly spin up an environment and run interactive data analysis.​

🔧 Bug Fixes & Stability

1. MySQL CDC timestamp precision update -
   Updated the _cdc_timestamp value for MySQL to store time with millisecond precision for more accurate change tracking.

2. MySQL CDC ENUM update handling -
   Fixed MySQL CDC update events for ENUM columns by resolving int64 enum index values from the binlog to their actual ENUM strings before writing them into Parquet.

3. Kafka topic schema discovery fix -
   Fixed Kafka topic-to-streams schema discovery to produce streams with correct data types.

4. Parquet file naming for proper sorting -
   Updated Parquet file naming convention to use zero-padded date and time components so files sort correctly by timestamp, for e.g., previous = 2026-1-3_8-27-56_01KE1FGTKPFDMN79ZN9P47KYY0.parquet and current = 2026-01-03_08-26-26_01KE1FE28V82MCTY1M02DBM3G7.parquet.

5. Catalog default streams tracking -
   Added a default_streams property to the catalog type to record all streams discovered initially, providing a clear baseline list for stream selection and management.