Worked on the mongodb/mongosql repository to deliver enhanced schema derivation for constant aggregation operators, focusing on improving query correctness and downstream engine reliability. Leveraged Rust and JSON to implement custom serialization and deserialization for date and string manipulation functions, ensuring accurate schema inference across new aggregation features. Developed comprehensive tests to validate these schema derivation enhancements, supporting safer expansion of the aggregation pipeline. The work addressed schema-related query planning errors by refining how constant operators and function support are handled, resulting in more robust query planning and execution. No major bugs were fixed during this period, with efforts centered on feature development.