The following bug has been logged online:
Bug reference: 2704
Logged by: Toru SHIMOGAKI
Email address: [EMAIL PROTECTED]
PostgreSQL version: 8.1.4
Operating system: Red Hat Enterprise Linux AS 4
Description: pg_class.relchecks overflow problem
Details:
Hi,
pg_class.relchecks is defined as int2. But the upper bound of this value is
not checked and it overflows.
I found it at the following case:
1. I tried to add check constraints:
"alter table test_a add check (aaa > i);" (0 <= i <= 32767)
2. When I added the 32768th check constraint, the value of pg_class.relchecs
became -32768.
postgres=# alter table test_a add check ( aaa > 32768 );
ALTER TABLE
postgres=# select relname, relchecks from pg_class where relname =
'test_a';
relname | relchecks
---------+-----------
test_a | -32768
(1 row)
3. The following error message was found when I added the next one:
postgres=# alter table test_a add check ( aaa > 32769 );
ERROR: unexpected constraint record found for rel test_a
postgres=# select relname, relchecks from pg_class where relname =
'test_a';
relname | relchecks
---------+-----------
test_a | -32768
(1 row)
Best regards,
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