Worked on enhancing the stability and reliability of Parquet integration within the mathworks/arrow repository, focusing on bug fixes and test coverage rather than new feature development. Addressed critical issues in C++ related to schema conversion and data handling, such as guarding against null-dereference in LIST-annotated groups and preventing unnecessary decompression when uncompressed value lengths are zero. Enforced a row-group limit for encrypted files to align with int16 constraints, reducing potential runtime errors in production pipelines. Expanded tests and implementation updates ensured improved regression safety and codec coverage, leveraging expertise in C++, compression algorithms, and encryption workflows throughout the process.