RE: [PATCH] Use indexes on the subscriber when REPLICA IDENTITY is full on the publisher

> One last thing - do you think there is any need to mention this
> behaviour in the pgdocs, or is OK just to be a hidden performance
> improvement?

FYI - I put my opinion.
We have following sentence in the logical-replication.sgml:

```
...
If the table does not have any suitable key, then it can be set
   to replica identity <quote>full</quote>, which means the entire row becomes
   the key.  This, however, is very inefficient and should only be used as a
   fallback if no other solution is possible.
...
```

Here the word "very inefficient" may mean that sequential scans will be executed every time.
I think some descriptions can be added around here.

Best Regards,
Hayato Kuroda
FUJITSU LIMITED