To: pgsql-sql@postgresql.org
From: Sebastien FLAESCH <sf@4js.com>
Subject: TRUNCATE TABLE corrupts pg_class.relfilenode = pg_attrdef.pg_attrdef
Organization: Four Js Development Tools
Message-ID: <66def74b-633e-65a0-cf44-4d486f15ebd9@4js.com>
Date: Mon, 22 May 2017 12:51:27 +0200
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Hi all,

Testing with Postgresql 9.6rc1 (but also detected with prior versions):

It is normal that a TRUNCATE TABLE statement changes the table/sequence relation in pg_attrdef?

test1=> create table mytab ( pkey serial, name varchar(10) );
test1=> select a.adsrc from pg_class p join pg_attrdef a on (p.relfilenode = a.adrelid) where lower(p.relname) = lower('mytab');
                 adsrc
-------------------------------------
  nextval('mytab_pkey_seq'::regclass)
(1 row)

test1=> truncate table mytab;
TRUNCATE TABLE
test1=> select a.adsrc from pg_class p join pg_attrdef a on (p.relfilenode = a.adrelid) where lower(p.relname) = lower('mytab');
  adsrc
-------
(0 rows)

test1=> select adrelid, adsrc from pg_attrdef where adsrc like '%mytab%';
  adrelid |                adsrc
---------+-------------------------------------
  6904163 | nextval('mytab_pkey_seq'::regclass)
(1 row)


Are we mis-using the condition (p.relfilenode = a.adrelid) in the first SELECT?

How can we easily check if a table is defined with a SERIAL type?

Thanks!
Seb


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