In #58923, we added the ability to set a column as VISIBLE and NOT VISIBLE.

We now need the ability to have ALTER COLUMN <col> SET [VISIBLE|NOT VISIBLE].

The changes to do this are as follows (you can follow SET DEFAULT as a guideline for what to write)

• Add a type AlterTableSetVisible struct { Visible bool } struct to tree/alter_table.go, similar to AlterTableSetDefault.
• Add th

It would be great to implement test case reduction strategies in SQLancer itself. The advantage of doing this in SQLancer, rather than an external tool like C-Reduce, is that we have all the information on whether a specific bug is still triggered (e.g., that two queries should yield the same result) and that the reduction can likely go further than when having an external interestingness test (e.