Naveen focused on enhancing the reliability of Spark SQL deduplication in the apache/spark repository by developing targeted regression tests for post-join deduplication under partial clustering scenarios. Using Scala and Spark SQL, he expanded the KeyGroupedPartitioningSuite with new tests that validated deduplication logic after shuffle joins and window operations, as well as checkpointed scans. His work addressed a previously fixed bug, ensuring that future changes would not reintroduce regressions. By concentrating on test coverage rather than user-facing features, Naveen improved production stability for complex data processing workflows, demonstrating depth in testing and a strong understanding of Spark SQL internals.