aggregation not supported for dynamic properties

[kosinsky]

Create OData endpoint for Items entity defined as

    public class Item
    {
        [Key]
        public int ItemId { get; set; }
// other properties
        public IDictionary<string, object> DynamicProperties { get; set; }
    }

Try to run query Items?$apply=aggregate(I with max as MaxId) where I is dynamic property.
It will fail with ArgumentNull exception:

at Microsoft.OData.ExceptionUtils.CheckArgumentNotNull[T](T value, String parameterName)
at Microsoft.OData.UriParser.Aggregation.AggregateExpression..ctor(SingleValueNode expression, AggregationMethod method, String alias, IEdmTypeReference typeReference)
at Microsoft.OData.UriParser.Aggregation.ApplyBinder.BindAggregateExpressionToken(AggregateExpressionToken token)
at Microsoft.OData.UriParser.Aggregation.ApplyBinder.BindAggregateToken(AggregateToken token)
at Microsoft.OData.UriParser.Aggregation.ApplyBinder.BindApply(IEnumerable`1 tokens)
at Microsoft.OData.UriParser.ODataQueryOptionParser.ParseApplyImplementation(String apply, ODataUriParserConfiguration configuration, ODataPathInfo odataPathInfo)
at Microsoft.OData.UriParser.ODataQueryOptionParser.ParseApply()
at System.Web.OData.Query.ApplyQueryOption.get_ApplyClause()

Assemblies affected

OData .Net lib 6.15.* OData .Net lib 7.0.*

Additional details

Reason is that for SingleValueOpenPropertyAccessNode TypeReference is null, but AggregateExpression expects not null

[robward-ms]

Merged, fixed.

[robward-ms]

Need port of #813 to 7.x

[kosinsky]

Port to 7.x #816

[xuzhg]

Fixed at: 88bd1a8

Thanks, and please let us know any problem.