| From: | Dilip Kumar <dilipbalaut(at)gmail(dot)com> |
|---|---|
| To: | Artus de benque <artusdebenque(at)gmail(dot)com> |
| Cc: | pgsql-bugs(at)postgresql(dot)org, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Postgresql bug report - unexpected behavior of suppress_redundant_updates_trigger |
| Date: | 2017-06-19 15:40:11 |
| Message-ID: | CAFiTN-tQat3h8qDVH1Z+KpYOL_PwCG0zYDzfbt-YnRxByfhSvw@mail.gmail.com |
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| Lists: | pgsql-bugs pgsql-hackers |
On Mon, Jun 19, 2017 at 5:20 PM, Artus de benque
<artusdebenque(at)gmail(dot)com> wrote:
> postgres=# UPDATE test_table SET field = 'hi' WHERE id = 1;
> UPDATE 0
> test_db=# UPDATE test_table SET field = rpad('', 2001, 'a') WHERE id = 1;
> UPDATE 1
> test_db=# UPDATE test_table SET field = rpad('', 2001, 'a') WHERE id = 1;
> UPDATE 1 <--- BUG: expected 0, as we ran the same update twice
Seems like in "suppress_redundant_updates_trigger" we are comparing
toasted tuple with the new tuple and that is the cause of the bug.
--
Regards,
Dilip Kumar
EnterpriseDB: http://www.enterprisedb.com
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