Re: [SQL] TRUNCATE TABLE corrupts pg_class.relfilenode = pg_attrdef.pg_attrdef

Sebastien FLAESCH <sf@4js.com> writes:
> It is normal that a TRUNCATE TABLE statement changes the table/sequence relation in pg_attrdef?

It is normal for TRUNCATE, as well as several other kinds of DDL, to
change relfilenode.

> test1=> select a.adsrc from pg_class p join pg_attrdef a on (p.relfilenode = a.adrelid) where lower(p.relname) =
lower('mytab');

This query is simply wrong; the join column should be p.oid.  See the
system catalog definitions,

https://www.postgresql.org/docs/current/static/catalogs.html
        regards, tom lane