Not a real issue for me, but I'm just curious: is mclient supposed to be compatible with an earlier release of mserver5 (at least the previous release)?
$ mclient x -u monetdb
password:
Welcome to mclient, the MonetDB/SQL interactive terminal (Mar2018)
Type \q to quit, \? for a list of available commands
auto commit mode: on
sql>-- \d silently fails (nothing dumped)
sql>\d
sql>
sql>-- \d on a table doesn't find table comments (introduced in Mar2018)
sql>\d tables
SELECT: no such table 'comments'
Shouldn't queries that rely on the system catalog be defined server-side?