Trim Function in Query Editor When Using Power BI Direct Query

When using Power BI direct query mode, I am unable to perform the trim string transformation function found in the query editor.
I am using the Impala (beta) driver.

To reproduce:
Connect to server using Impala driver in direct query mode
Create a live connection to a string table.
Open up query editor and right click on the string column
Look under "Transform" and click on "Trim"
-> Power BI would show a warning "This step results in a query that is not supported in DirectQuery mode"

Any help would be appreciated!

Best,

FD