FIX: PolyBase defaults string mapping for Microsoft Spark ODBC driver in SQL Server 2019

Applies to: SQL Server 2019 on Windows


When you use PolyBase GenericODBC connector to query Spark that uses the Microsoft Spark ODBC Driver, the type mapping for the"STRING" typewill recommend CHAR(8000) instead of VARCHAR(MAX) in SQL Server 2019.


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section. 


This issue is fixed in the following cumulative update for SQL Server:
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