presto-main/src/main/java/io/prestosql/sql/planner/ResolvedFunctionCallRewriter.java/ResolvedFunctionCallRewriter/Visitor
class ResolvedFunctionCallRewriter:        public Visitor(Map<NodeRef<FunctionCall>, ResolvedFunction> resolvedFunctions)
        {
            this.resolvedFunctions = requireNonNull(resolvedFunctions, "resolvedFunctions is null");
        }