Worked on the percona/percona-server-mongodb repository to enhance query performance by refactoring the distinct scan index selection logic, particularly for queries involving wildcard indexes. Focused on improving the clarity, maintainability, and reliability of the index-choosing path, the work removed duplicated logic in the getIndexEntriesForDistinct function. This targeted update, implemented in C++ with an emphasis on database optimization and query planning, reduced the risk of inconsistent behavior across distinct queries. The changes enabled faster and more predictable distinct queries on wildcard indexes, supporting higher throughput workloads and contributing to the overall maintainability of the codebase.