KB4581886 - FIX: Joins not getting pushed down for PolyBase query that joins multiple external tables

Symptoms

Assume that you have a PolyBase query that joins multiple external tables from one or more external data sources that accept join pushdown (that is, SQL Server, Oracle, Teradata, MongoDB, or Generic ODBC). When you run the query, you notice that the joins are not pushed down to the external data sources. This situation typically occurs because of the presence of a global aggregation in at least one of the input operator trees.

Resolution

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

About cumulative updates for SQL Server:

Each new cumulative update for SQL Server contains all the hotfixes and all the security fixes that were included with the previous cumulative update. Check out the latest cumulative updates for SQL Server:

Status

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

References

Learn about the terminology that Microsoft uses to describe software updates.

Third-party information disclaimer
The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, about the performance or reliability of these products.

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