Re: row filtering for logical replication

Hi

Andres complained about the safety of doing general expression
evaluation in pgoutput; that was first in 

https://postgr.es/m/20210128022032.eq2qqc6zxkqn5syt@alap3.anarazel.de
where he described a possible approach to handle it by restricting
expressions to have limited shape; and later in
http://postgr.es/m/20210331191710.kqbiwe73lur7jo2e@alap3.anarazel.de

I was just scanning the patch trying to see if some sort of protection
had been added for this, but I couldn't find anything.  (Some functions
are under-commented, though).  So, is it there already, and if so what
is it?  And if it isn't, then I think it should definitely be put there
in some form.

Thanks

-- 
Álvaro Herrera              Valdivia, Chile  —  https://www.EnterpriseDB.com/