/// <summary>
/// Get the promoted type reference of the operand
/// </summary>
/// <param name="operand">the operand</param>
/// <param name="unaryOperatorKind">the operator kind</param>
/// <returns>the type reference of the operand</returns>
private static IEdmTypeReference PromoteOperandType(SingleValueNode operand, UnaryOperatorKind unaryOperatorKind)
{
IEdmTypeReference typeReference = operand.TypeReference;
if (!TypePromotionUtils.PromoteOperandType(unaryOperatorKind, ref typeReference))
{
string typeName = operand.TypeReference == null ? "<null>" : operand.TypeReference.ODataFullName();
throw new ODataException(ODataErrorStrings.MetadataBinder_IncompatibleOperandError(typeName, unaryOperatorKind));
}
return(typeReference);
}