Group questions on the date field by month

[kingling-abb]

Filter working：odata/dirs/deliverrecords?filter=month(deliveryDate) eq 3

GroupBy ：odata/dirs/deliverrecords?$apply=groupby((month(deliveryDate)), aggregate($count as TotalCount))

{
"error": {
"code": "",
"message": "The query specified in the URI is not valid. Expression expected at position 28 in 'groupby((month(deliveryDate)), aggregate($count as TotalCount))'.",
"details": [],
"innererror": {
"message": "Expression expected at position 28 in 'groupby((month(deliveryDate)), aggregate($count as TotalCount))'.",
"type": "Microsoft.OData.ODataException",
"stacktrace": " at Microsoft.OData.UriParser.UriQueryExpressionParser.ParseGroupBy()\r\n at Microsoft.OData.UriParser.UriQueryExpressionParser.ParseApply(String apply)\r\n at Microsoft.OData.UriParser.ODataQueryOptionParser.ParseApplyImplementation(String apply, ODataUriParserConfiguration configuration, ODataPathInfo odataPathInfo)\r\n at Microsoft.OData.UriParser.ODataQueryOptionParser.ParseApply()\r\n at Microsoft.AspNetCore.OData.Query.ApplyQueryOption.get_ApplyClause()\r\n at Microsoft.AspNetCore.OData.Query.Validator.ODataQueryValidator.Validate(ODataQueryOptions options, ODataValidationSettings validationSettings)\r\n at Microsoft.AspNetCore.OData.Query.ODataQueryOptions.Validate(ODataValidationSettings validationSettings)\r\n at Microsoft.AspNetCore.OData.Query.EnableQueryAttribute.ValidateQuery(HttpRequest request, ODataQueryOptions queryOptions)\r\n at Microsoft.AspNetCore.OData.Query.EnableQueryAttribute.OnActionExecuting(ActionExecutingContext actionExecutingContext)"
}
}
}

.NET 8.0
Include="Microsoft.AspNetCore.OData" Version="8.2.5"

How should I write this grouping query?

[rbalagangadharan]

Try this $apply=compute(month(deliveryDate) as deliveryDate)/groupby((deliveryDate),aggregate($count as Count))

[kingling-abb]

Great! There is also a small problem, the name setting is different. The statement is completely correct
like this apply=compute(month(deliveryDate) as deliveryDateMonth)/groupby((deliveryDateMonth),aggregate($count as Count))