During February 2025, Xhumanoid focused on enhancing query reliability in the StarRocks/starrocks repository by addressing a subtle bug in predicate evaluation. They implemented a fix in the ChunkPredicateBuilder component to ensure that get_predicate_value consistently receives the root expression, correcting an invalid expression usage that previously risked incorrect query results. This change improved the accuracy of predicate pruning and aligned evaluation semantics with intended behavior. Working primarily with C++ and SQL, Xhumanoid demonstrated a strong understanding of database internals and bug fixing, contributing to the stability and correctness of a critical path in the query planning and evaluation process.