Worked on the tobymao/sqlglot repository to deliver a feature enhancing type handling in the SQLGlot optimizer for Spark and Databricks. Focused on annotating and enabling the Typeof function, the work improved type inference and query correctness in SQL queries. The technical approach involved updating typing definitions and refreshing test fixtures to ensure the new Typeof feature operated reliably across Spark environments. Utilized Python and SQL, with an emphasis on data processing and type annotations. Incorporated code-review feedback and addressed minor integration issues, demonstrating attention to project standards and reliability, though no major customer-facing bugs were addressed during this period.