Worked on the apache/calcite repository to deliver stability improvements to the ValuesReduceRule, focusing on preserving query plans when filter conditions are irreducible. The approach involved ensuring that reduced values are RexLiteral instances before evaluating filter conditions, which prevents unintended tuple drops and maintains data integrity. Consolidated related tests into the RelOptRulesTest suite, streamlining regression tracking and improving maintainability. Utilized Java and SQL, with an emphasis on unit testing and software development best practices. The work reduced production risk, supported smoother releases, and laid a foundation for future enhancements to rule processing within the Calcite query optimization framework.