Initially we were storing CDC options in scylla tables but then we realized
that we can use schema extensions. Extensions are more flexible and cause less
problems with schema digest.
The transition was done in 4.0 and with that we stopped reading 'cdc' column
in scylla tables. Commit 861c7b5626 removed
the code that used to read 'cdc' column.
Since no Scylla node should be reading 'cdc' column, we can always keep
it empty now. This will allow removal of schema::cdc_options in the future.
Signed-off-by: Piotr Jastrzebski <piotr@scylladb.com>
20bc93b941