During December 2025, qindongliang addressed a critical bug in the apache/spark repository by correcting the Spark SQL ROUND function’s handling of decimal precision. The work involved modifying the RoundBase logic to use the target type’s precision rather than the input decimal’s, which previously caused NULL results for certain values. This fix, implemented in Scala and leveraging Spark’s data processing capabilities, improved the reliability of analytics and financial computations by ensuring accurate decimal rounding. The solution was validated through regression tests and continuous integration checks, demonstrating a strong grasp of big data, SQL, and robust testing practices in a production environment.