Custom assemblies not being referenced in Views - azure

Question

If a custom c# assembly is used in a View, the compiler fails to find the reference to the namespace.
It works if the assembly is referenced and called within a query but not from a view.
For instance, consider this U-SQL script for creating a view:
The assemblies being used are registered in mylocaldb before running this query, and are available to be accessed in any script.
USE DATABASE mylocaldb;
REFERENCE ASSEMBLY [Newtonsoft.Json];
REFERENCE ASSEMBLY [Microsoft.Analytics.Samples.Formats];
USING Newtonsoft.Json;
USING Microsoft.Analytics.Samples.Formats.Json;
DROP VIEW IF EXISTS SearchAccountData;
CREATE VIEW MyView AS
EXTRACT
UserId string,
UserName string
FROM "Data/mydata.json"
USING new Microsoft.Analytics.Samples.Formats.Json.JsonExtractor();
After the execution of the script, the view gets created and stored an under Views in the mylocaldb database.
Upon using the view in another query:
USE DATABASE mylocaldb;
USE SCHEMA dbo;
REFERENCE ASSEMBLY [Newtonsoft.Json];
REFERENCE ASSEMBLY [Microsoft.Analytics.Samples.Formats];
USING Newtonsoft.Json;
USING Microsoft.Analytics.Samples.Formats.Json;
#foo= SELECT * FROM MyView;
OUTPUT #foo
TO "/output/foo.csv"
USING Outputters.Csv();
(the USE SCHEMA dbo isn't necessary as the database defaults to that in case no other schema is being used):
the compiler throws an error:
E_CSC_USER_INVALIDCSHARP: C# error CS0234: The type or namespace name 'Samples' does not exist in the namespace 'Microsoft.Analytics' (are you missing an assembly reference?)
Now this might be conflicting with the library that comes with U-SQL: Microsoft.Analytics, but I have tried using another assembly with a different namespace, and I still have the same issue.
I am testing locally using the (Local) account in VisualStudio.

Answer 1

I decided to use a PROCEDURE.
In Views UDFs (User Defined Functions) or UDOs can't be used.
Views cannot:
Contain user-defined objects (such as UDFs or UDOs).
Will be inlined upon call.
This information can be found here on slide 27 at U-SQL - Azure Data Lake Analytics for Developers
It would be helpful if this was mentioned in U-SQL Language Reference docs for Views.
Unlike Views, procedures and table-valued functions have support for UDFs and can include Reference to assemblies:.
CREATE PROCEDURE ExtractTransactions(#data_stream string = #"Data/{*}")
AS BEGIN
REFERENCE ASSEMBLY [Newtonsoft.Json];
REFERENCE ASSEMBLY [Microsoft.Analytics.Samples.Formats];
USING Newtonsoft.Json;
USING Microsoft.Analytics.Samples.Formats.Json;
#transactions =
EXTRACT
UserId string,
UserName string
FROM #data_stream
USING new JsonExtractor();
INSERT INTO ExtractedTransactions
SELECT * FROM #transactions;
END;
And then simply call the procedure from another query:
ExtractTransactions(DEFAULT) (where DEFAULT is the default parameter).

Answer 2

Thanks Mike & sponturious. U-SQL Language Reference has been updated at CREATE VIEW (U-SQL) under the Query_Expression section at the official U-SQL Language Reference site
(Note: Would provide a link but the Gods keep deleting my responses when I do. Just do a search for "CREATE VIEW (U-SQL)".)