presto-main/src/main/java/io/prestosql/operator/scalar/RowComparisonOperator.java/RowComparisonOperator/getMethodHandles
class RowComparisonOperator:    protected List<MethodHandle> getMethodHandles(RowType type, Metadata metadata, OperatorType operatorType)
    {
        ImmutableList.Builder<MethodHandle> argumentMethods = ImmutableList.builder();
        for (Type parameterType : type.getTypeParameters()) {
            ResolvedFunction resolvedFunction = metadata.resolveOperator(operatorType, ImmutableList.of(parameterType, parameterType));
            argumentMethods.add(metadata.getScalarFunctionImplementation(resolvedFunction).getMethodHandle());
        }
        return argumentMethods.build();
    }