Proposed ALTER COLUMN varchar TYPE enum missing USING

[rogersheu]

I was recently running a quick change to create an enum and change the type of an existing column in a table (with matching values) to that enum.

The attempted change was ALTER TABLE foo_table ALTER COLUMN bar_column TYPE baz_enum;
I was getting an error where the column FOO cannot be cast automatically to type ENUM_NAME

However, from a quick search, it might need the following to apply correctly.
ALTER TABLE foo_table ALTER COLUMN bar_column TYPE baz_enum USING bar_column::baz_enum;

I think this is a similar issue to #3130, but not 100% exactly the same.