presto-main/src/main/java/io/prestosql/sql/planner/ExpressionInterpreter.java/ExpressionInterpreter/invokeOperator
class ExpressionInterpreter:        private Object invokeOperator(OperatorType operatorType, List<? extends Type> argumentTypes, List<Object> argumentValues)
        {
            ResolvedFunction operator = metadata.resolveOperator(operatorType, argumentTypes);
            return functionInvoker.invoke(operator, session, argumentValues);
        }