Worked on enhancing SQL parsing and syntax highlighting in the nvim-treesitter repository, focusing on adding support for Common Table Expressions (CTEs). The approach involved refining the parsing logic to introduce a dedicated CTE pattern and improving the accuracy of @type captures by ensuring function invocations were excluded, which reduced false positives in syntax highlighting. Leveraging skills in parsing, SQL, and syntax highlighting, the work improved both the precision and maintainability of the codebase. Scheme was used to implement these changes, resulting in more robust SQL parsing and aligning with the repository’s goal of delivering reliable language support for developers.