presto-main/src/main/java/io/prestosql/sql/analyzer/ExpressionTreeUtils.java/ExpressionTreeUtils/extractWindowFunctions
class ExpressionTreeUtils:    static List<FunctionCall> extractWindowFunctions(Iterable<? extends Node> nodes)
    {
        return extractExpressions(nodes, FunctionCall.class, ExpressionTreeUtils::isWindowFunction);
    }