Worked on improving stability and correctness in the delta-io/delta-kernel-rs repository, focusing on the conversion of MapArray to StructArray within the Arrow framework using Rust. Addressed a bug related to null bitmap propagation in the evaluate_map_to_struct function, ensuring that null values in MapArray inputs are accurately represented in the resulting StructArray outputs. This fix prevented Arrow validation errors during checkpoint creation for partitioned tables with non-nullable fields, particularly when writeStatsAsStruct was enabled. The work enhanced the robustness of checkpointing and downstream analytics, demonstrating attention to data processing reliability and correctness in complex, partitioned data environments.