ChoParquetRecordFieldConfiguration not being applied correctly on file write

[jsn-m]

Hi,

I'm using reflection to write a IEnumerable<POCO> to Parquet. In setting up data types for each property, I can see on debug that the writerInstance that calls the Write method has a correct List<ChoParquetRecordConfiguration> object (Nullable Integers, etc).
However when the Write method is called, all Nullable types that are Numeric are just written as Strings. Don't know if reflection is getting in the way.

Example of code:

Type dtoType = GetDtoType(initReqBodyData.PathRoot, initReqBodyData.PathName); // returns Type Root.Sales.Data.SalesItem
dynamic restResponseDto = JsonConvert.DeserializeObject(restResponse.Content, typeof(IList<>).MakeGenericType(dtoType));

IEnumerable<PropertyInfo> dtoProperties = dtoType.GetAllProperties();
Dictionary<string, Type> fieldsAndTypes = SetFieldTypes(dtoProperties);

Type genericParquetWriter = typeof(ChoParquetWriter<>).MakeGenericType(dtoType);
dynamic writerInstance = ChoActivator.CreateInstance(genericParquetWriter, new object[] { localPath, new ChoParquetRecordConfiguration()
        {
            TypeConverterFormatSpec = new ChoTypeConverterFormatSpec { EnumFormat = ChoEnumFormatSpec.Name },
            TreatDateTimeAsString = false,
            CultureName = "en-001",
            AutoDiscoverFieldTypes = false,
            CompressionLevel = CompressionLevel.Fastest,
            CompressionMethod = Parquet.CompressionMethod.Snappy,
            Append = File.Exists(localPath),
            FieldValueTrimOption = ChoFieldValueTrimOption.Trim,
        }
    }
);

foreach(string propertyName in dtoProperties.Select(c => c.Name)) 
{                             
    writerInstance.WithField(propertyName, fieldType: fieldsAndTypes[propertyName]);      
}

writerInstance.Write(restResponseDto);
writerInstance.Close();
writerInstance.Dispose();

Example of JSON:

	{
		"salesItemId": "<guid>",
		"tenantId": "<guid>",
		"parentSalesItemId": null,
		"salesId": "<guid>",
		"productId": "<guid>",
		"groupId": null,
		"bundleId": null,
		"description": "Test",
		"linePrice": 110.0,
		"quantity": 1,
		"detailAmount": null // Example of Null Decimal
		"taxRate": 0.95,
		"taxAmount": 6.53,
		"unitServiceFee": 12.0,
		"serviceFeeDetailAmount": 15.0,
		"serviceTaxRate": 1.25,
		"isRevenue": false,
		"groupEnum": "None",
		"modifiedDate": "2020-01-01T00:00:00.100000",
		"isDeleted": false,
		"serviceFeeTaxAmount": 13.0,
		"derivativeSalesList": [],
		"salesItemList": [],
		"salesList": null
	}

From the above, the detailAmount is a Nullable Double in the ChoParquetRecordConfiguration but when I examine the column in the Parquet file it's a VARCHAR / String.