During March 2026, Alex Elenskiy expanded ClickHouse dialect support in the tobymao/sqlglot repository by implementing ArrayDistinct function transpilation. He developed the feature using Python and SQL, ensuring that ArrayDistinct expressions could be correctly converted within the transpiler. To maintain reliability and prevent regressions, Alex wrote targeted tests that validated the new functionality. He also addressed a specific issue to guarantee that ArrayDistinct would transpile as intended, improving query portability for users integrating ClickHouse with sqlglot. The work demonstrated a focused approach to feature development and testing, with depth in both implementation and validation, though it covered a narrow scope.