Hello @Anonymous ,
Thanks for the question and using MS Q&A platform.
As we understand the ask here is how to preserve the data type in delta tables , please do let us know if its not accurate.
I think the issue here is that you are using CSV file as the staging file type . If you use paraquet or Azure SQL as the staging data store it should work . In the CSV world everythings is string .
Please do let me if you have any queries.
Thanks
Himanshu
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