FIX: Error occurs when you try to create external table in PolyBase with database_default as collation in SQL Server 2019

Applies to: SQL Server 2019 on LinuxSQL Server 2019 on Windows


Consider the following scenario:

You try to create an external table in PolyBase in SQL Server 2019 that has the following conditions:
  • One or more column definitions use database_default as the collation.
  • The external data source that's used is a HADOOP data source type.
In this situation, you receive an error message that resembles the following:

The given key was not present in the dictionary.


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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