Thanks, @Louis_Frolio

My understanding is that DLT only allows for materialized views and streaming tables. When you say, "liquid clustering is supported for Delta Lake tables managed through DLT Preview and Current channels", do you mean that liquid clustering is only supported for DLT streaming tables?

Our use case requires a MERGE, which is why I was attempting to use a mat view.  Streaming tables are APPEND only, and so are not suitable for this. This sounds like if we want to take advantage of liquid clustering (or, any kind of clustering?) for a table which will be receiving updates, we can't use DLT.  Can you confirm? 

I note that OPTIMIZE is meant to be taken care of by Predictive Optimization, now on by default.

Do you know if there are plans to allow for liquid clustering on DLT mat views in a future release?