Developed and contributed a new RowLen method to the ColArr type in the proto package of the ClickHouse/ch-go repository, enabling precise calculation of individual row lengths within column arrays by leveraging the Offsets field. This addition supports more accurate memory usage estimation and enhances row-wise data processing. The implementation was accompanied by comprehensive unit tests to ensure correctness across multiple scenarios, reflecting a methodical approach to validation. The work demonstrated proficiency in Go development, data structures, and protocol buffers, focusing on reliability and maintainability. No major bugs were addressed during this period, with efforts concentrated on feature development and testing.