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Query Folding in Direct Query Plus Import Scenarios

Marc Lelijveld violates Betteridge’s Law of Headlines:

Recently, I run into a case where we wanted to combine Direct Query sources with imported data. Well, this functionality is actually called composite models nowadays.

Having that said, let me start with managing some expectations for this post. The title says composite models, but I have to admit, it is not about the to be released composite models feature where you can combine multiple Power BI datasets. Instead of that, it is about combining Direct Query and Import mode in one single dataset.

In this blogpost I will describe more about my use case, why I considered to use some sources on Direct Query, how this combines with Row Level Security and Query Folding.

Read on for the test.

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