Hello @leungi ,

I've reproduced the issue and it appears that specifying the data type of the column is necessary for the statement to work. Here's an example:

CREATE MATERIALIZED VIEW my_mv
 (col_1 STRING COMMENT 'Column 1', col_2 INT COMMENT 'Column 2')

I will consult with Databricks engineering to determine if this is the expected behavior or if there is potential for enhancement.