During January 2025, this developer focused on improving the query planner in the databendlabs/databend repository by addressing a critical bug affecting constant table scans. Using their expertise in Rust programming, database internals, and query optimization, they introduced the clear_lazy_columns function to ensure that lazy columns are preserved when filters are rewritten to empty scans. They integrated this solution into rule_eliminate_filter.rs and created a dedicated regression test, issue_17158.test, to validate the fix and prevent future regressions. Their work enhanced the reliability of query results and contributed to the overall stability and correctness of the Databend codebase.