During April 2025, this developer contributed to the apache/incubator-gluten repository by addressing a critical bug in the query engine’s handling of PartialMerge aggregate expressions. Using Java and Scala, they refined the rewriteAggregateExpression logic to prevent extraction of expressions in Partial and Complete modes, thereby eliminating invalid reference bindings in the ProjectExecTransformer. This backend development work improved the correctness and stability of distributed analytics queries, reducing runtime failures and support overhead in production environments. Their approach demonstrated a deep understanding of query optimization and distributed systems, focusing on precise, targeted changes that enhanced the reliability and predictability of SQL query execution.