private IEdmTypeReference CreateAggregateExpressionTypeReference(SingleValueNode expression, AggregationMethod withVerb)
{
var expressionType = expression.TypeReference;
if (expressionType == null && aggregateExpressionsCache != null)
{
var openProperty = expression as SingleValueOpenPropertyAccessNode;
if (openProperty != null)
{
expressionType = GetTypeReferenceByPropertyName(openProperty.Name);
}
}
switch (withVerb)
{
case AggregationMethod.Average:
var expressionPrimitiveKind = expressionType.PrimitiveKind();
switch (expressionPrimitiveKind)
{
case EdmPrimitiveTypeKind.Int32:
case EdmPrimitiveTypeKind.Int64:
case EdmPrimitiveTypeKind.Double:
return(EdmCoreModel.Instance.GetPrimitive(EdmPrimitiveTypeKind.Double, expressionType.IsNullable));
case EdmPrimitiveTypeKind.Decimal:
return(EdmCoreModel.Instance.GetPrimitive(EdmPrimitiveTypeKind.Decimal, expressionType.IsNullable));
default:
throw new ODataException(
ODataErrorStrings.ApplyBinder_AggregateExpressionIncompatibleTypeForMethod(expression,
expressionPrimitiveKind));
}
case AggregationMethod.CountDistinct:
return(EdmCoreModel.Instance.GetPrimitive(EdmPrimitiveTypeKind.Int64, false));
case AggregationMethod.Max:
case AggregationMethod.Min:
case AggregationMethod.Sum:
return(expressionType);
default:
throw new ODataException(ODataErrorStrings.ApplyBinder_UnsupportedAggregateMethod(withVerb));
}
}
