Re: pgbench - refactor init functions with buffers

Hello Andres,

>> Attached v3 shorten some lines and adds "append_tablespace".

A v4 which just extends the patch to newly added 'G'.

> I'd prefer not to expand the use of pqexpbuffer in more places, and
> instead rather see this use StringInfo, now that's also available to
> frontend programs.

Franckly, one or the other does not matter much to me.

However, pgbench already uses PQExpBuffer, it uses PsqlScanState which 
also uses PQExpBuffer, and it intrinsically depends on libpq which 
provides PQExpBuffer: ISTM that it makes sense to keep going there, unless 
PQExpBuffer support is to be dropped.

Switching all usages would involve a significant effort and having both 
PQExpBuffer and string_info used in the same file for the same purpose 
would be confusing.

-- 
Fabien.