Worked on enhancing schema evolution handling in the Eventual-Inc/Daft repository, focusing on Parquet files where columns may be missing due to evolving data models. Addressed a bug by introducing a helper to substitute missing columns with null literals, ensuring that predicate pushdown operates correctly and aligns with SQL semantics. Improved cross-module type and null handling, which led to more reliable row group pruning and reduced runtime errors when reading older files under Iceberg evolution. The work involved changes across multiple Rust crates and demonstrated strong skills in Rust programming, data engineering, and database management, emphasizing correctness and maintainability.