Worked on the tobymao/sqlglot repository to address a bug in SQL query generation involving duplicate table aliases. Focused on refining the qualify_tables function, the developer improved alias resolution logic to ensure fully-qualified names are mapped to the correct table aliases, particularly when the same table appears multiple times in a query. The solution involved updating the alias population process to prevent overwriting existing mappings and adding a regression test to cover these edge cases. Utilizing Python, SQL, and unit testing, the work enhanced the reliability and accuracy of SQL generation, reducing potential data-inference errors and streamlining quality assurance efforts.