RisingWave Community - Is there a mechanism to alter a few columns in an existing materialized view without recomputing all other data?

Currently, there is no direct ALTER command to modify specific columns in a materialized view without recomputing all other data.
One workaround could be to consider using nested types like struct, or creating new materialized views and dropping the old ones.
Adding or dropping columns in materialized views involves complex changes in internal streaming states, so careful design is necessary before implementing such features.
Creating multiple materialized views per column could be an approach, but it may lead to a large number of tables. However, there are no scaling issues or overhead concerns with the number of tables, as they are treated as a whole in the system.
There is a plan to support the jsonb type, which would allow specifying nested columns as jsonb without requiring a concrete type or schema.