Rajeev Singh developed a header-only view option for query plan summaries in the IBM/velox repository, focusing on improving diagnosability and performance for large query plans. He introduced a nodeHeaderOnly flag to PlanSummaryOptions and updated the toSummaryString method in PlanNode.cpp, enabling concise summaries that include only plan node headers when desired. This C++ feature reduced verbosity in plan outputs, making it easier for developers to analyze complex queries. Rajeev applied skills in code refactoring, query planning, and software development, delivering a targeted solution that addressed the challenge of managing large-scale query plan representations without introducing new bugs.