presto-main/src/main/java/io/prestosql/operator/scalar/RowEqualOperator.java/RowEqualOperator/resolveEqualOperator
class RowEqualOperator:    private static MethodHandle resolveEqualOperator(Type type, Metadata metadata)
    {
        ResolvedFunction operator = metadata.resolveOperator(EQUAL, ImmutableList.of(type, type));
        ScalarFunctionImplementation implementation = metadata.getScalarFunctionImplementation(operator);
        return implementation.getMethodHandle();
    }