Worked on the pola-rs/polars repository, focusing on enhancing the reliability of batch-skipping logic in data pipelines. Addressed a critical bug in the skip_batches pathway by ensuring correct negation of boolean values that may include None, which previously led to errors in condition evaluation. Utilized Rust to implement the fix and expanded the test suite to cover scenarios involving negation and null values, thereby strengthening the robustness of the system. Applied skills in data analysis, testing, and Python to validate the solution, ultimately improving the correctness and dependability of conditional evaluation within the Polars backend for diverse data scenarios.