Joining Issues

Hello -

        I have some problems in joining the processed output with the original col


Original File Contained 2 columns: Product Title & Product Description

String to Document Convertor: Ran on Product Description to Produce a column: Document

Bag of Words output: Keywords, Document & Original Document

Goal: Join & Associate the keywords with Product Title 

Joiner: Joining on Document (from String to Document Convertor) to Original Document (from Bag of Words) 

Type of Join: Full Outer Join ( I have tried others too)

Selected Columns: Product Title & Keywords

Outcome: Product Title with a ? in the Keywords Column


Any suggestions on how to go about solving the problem is much appreciated

Any chance we can see an example workflow?