From: | Sebastien FLAESCH <sf(at)4js(dot)com> |
---|---|
To: | pgsql-sql(at)postgresql(dot)org |
Subject: | TRUNCATE TABLE corrupts pg_class.relfilenode = pg_attrdef.pg_attrdef |
Date: | 2017-05-22 10:51:27 |
Message-ID: | 66def74b-633e-65a0-cf44-4d486f15ebd9@4js.com |
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Lists: | pgsql-sql |
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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