Best Practices for Schema Evolution in Apache Iceberg: Making Your Data Future-Proof

#icebergSummit 2025 breakout session delivered by Rajesh Vayyala, PRA Group, Inc. Session Description: One of the most powerful features of #ApacheIceberg is its ability to evolve schemas without breaking existing queries. Unlike traditional data lake architectures that require table rewrites or migrations, Iceberg allows seamless adding, renaming, and modifying columns while maintaining query efficiency. In this session, we’ll explore best practices for schema evolution, including: When and how to add new columns safely. Handling data type changes without breaking downstream applications. The impact of renaming or dropping columns on query performance. Real-world case studies on schema evolution strategies in production. By the end of this talk, attendees will gain a clear understanding of how to design flexible and future-proof schemas that scale with changing business needs.