Using DirectQuery for Power BI datasets and Azure Analysis Services (preview)

https://docs.microsoft.com/en-us/power-bi/connect-data/desktop-directquery-datasets-azure-analysis-services 

With DirectQuery for Power BI datasets and Azure Analysis Services (AAS), you can use DirectQuery to connect to AAS or Power BI datasets and if you want, combine it with other DirectQuery and imported data. Report authors who want to combine the data from their enterprise semantic model with other data they own, such as an Excel spreadsheet, or want to personalize or enrich the metadata from their enterprise semantic model, will find this feature especially useful.