Azure SQL Data Warehouse and PolyBase can't read CSV files generated using U-SQL and ADLA
This is unexpected and the SQL Data Warehouse team would like to investigate this issue. Can you create a support ticket by following the instructions in the link below?
If you don't have a support plan (required to create a technical support case), please email the SQL Data Warehouse team directly at sqldwfeedback@microsoft.com and include your server name, database name, error message and the approximate timestamp of this error.