StatementAnalyzer.java Added imports and new methods to analyze window definitions and resolve window functions. ExpressionTreeUtils.java Introduced static methods to extract window functions and nested window expressions. ExpressionAnalyzer.java Updated logic to process window function calls and integrated window analysis into expression processing. ExpressionAnalysis.java Extended analysis result to include window functions. Analysis.java Added maps and methods to record window definitions, window functions, and order-by window functions. PlanVisitor.java, PlanNodeType.java, PlanGraphPrinter.java Added new visit methods and node types to support window function planning and visualization. TableOperatorGenerator.java Integrated the new window function operators into the query execution plan. Various window frame and function files Updated window frame implementations and window function implementations (NthValue, Lead, Lag, NTile, etc.) to support new window query planning stage. FilterAndProjectOperator.java Triggered evaluation in column transformers as part of the projection process.