Forum Discussion
Fabric - semantic model - refresh
I found the issue
I had one view in the warehouse with two columns having identical names where one of them had a capital letter
I tried to refresh the warehouse from fabric gui and received the duplicate column name error message
It is fully possible (at least from sql endpoint) to create a view with two columns names aa and Aa for example. However its not supported in semantic models and semabtic model will not give you an indication of this issue
I think I will recommend to create a support ticket https://support.fabric.microsoft.com
Also, I think there are two separate concepts here:
- Edit the schema of the model ("Edit Tables"). https://learn.microsoft.com/en-us/fabric/get-started/direct-lake-edit-tables
- Refresh the data content. https://learn.microsoft.com/en-us/fabric/get-started/direct-lake-overview#refresh
I believe the first one is the cause of your issues?
The latter can be done automatically, in that case there would be no need for your users to refresh.
Perhaps you will find your issue listed as a Known issue here: https://learn.microsoft.com/en-us/fabric/get-started/fabric-known-issues#currently-active-known-issues
Similar topics:
Using Tabular Editor to edit semantic models may be an alternative.
Or using Power BI desktop (import mode).
Are you using Lakehouse or Warehouse?
Anyway, using views is bad for performance in direct lake semantic models. Views make the report queries fall back to DirectQuery (which has lower performance than Direct Lake). So the recommendation is to use tables, not views, if you wish to use Direct Lake mode.
I found the issue
I had one view in the warehouse with two columns having identical names where one of them had a capital letter
I tried to refresh the warehouse from fabric gui and received the duplicate column name error message
It is fully possible (at least from sql endpoint) to create a view with two columns names aa and Aa for example. However its not supported in semantic models and semabtic model will not give you an indication of this issue
That's interesting! Thanks for sharing. So parts of Fabric is case sensitive while other parts of Fabric is not case sensitive. That's good to know. I think there should be a warning indicator or error message for these kind of issues.