Worked on the snowflakedb/snowpark-java-scala repository, focusing on backend development and data engineering using Scala and SQL. Addressed a critical bug in the Column.in method, ensuring that when called with an empty sequence, it now returns a literal false expression to prevent incorrect query generation. This fix improves query correctness and reduces production risk in edge cases. Added targeted regression tests to verify the empty-sequence scenario and expanded test coverage for related edge cases, strengthening the reliability of query construction. The work emphasized correctness and stability, consolidating improvements to minimize future incidents and enhance the predictability of the codebase.