| From: | Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com> |
|---|---|
| To: | Hitoshi Harada <umi(dot)tanuki(at)gmail(dot)com> |
| Cc: | pgsql-bugs(at)postgresql(dot)org |
| Subject: | Re: BUG #6139: LIMIT doesn't return correct result when the value is huge |
| Date: | 2011-08-02 07:49:05 |
| Message-ID: | 4E37ABF1.5080609@enterprisedb.com |
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| Lists: | pgsql-bugs |
On 02.08.2011 09:25, Hitoshi Harada wrote:
> db1=# select count(*) from test_xy;
> count
> -------
> 31
> (1 row)
>
> db1=# select * from test_xy order by x LIMIT 9223372036854775807 OFFSET 6;
> gid | x | y
> -----+--------------------+--------------------
> 13 | -0.591943957968476 | -0.481611208406305
> (1 row)
The bug seems to occur when LIMIT + OFFSET >= 2^63. In ExecLimit
function, we check if current position >= offset + limit, and that
overflows.
I'll commit the attached patch to fix that. Thanks for the report
--
Heikki Linnakangas
EnterpriseDB http://www.enterprisedb.com
| Attachment | Content-Type | Size |
|---|---|---|
| fix-large-limit+offset.patch | text/x-diff | 499 bytes |
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