Re: [HACKERS] Tuple sort is broken. It crashes on simple test.

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От
Peter Geoghegan
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Re: [HACKERS] Tuple sort is broken. It crashes on simple test.
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CAM3SWZRtYCAEyyT9am4Te_CaizmHfPehzyRnEsjdc55zzQCBDQ@mail.gmail.com
Ответ на
Re: [HACKERS] Tuple sort is broken. It crashes on simple test. (Michael Paquier)
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[HACKERS] Tuple sort is broken. It crashes on simple test. Mithun Cy <mithun.cy@enterprisedb.com>
Re: [HACKERS] Tuple sort is broken. It crashes on simple test. Michael Paquier <michael.paquier@gmail.com>
Re: [HACKERS] Tuple sort is broken. It crashes on simple test. Peter Geoghegan <pg@heroku.com>
Re: [HACKERS] Tuple sort is broken. It crashes on simple test. Tom Lane <tgl@sss.pgh.pa.us>
Re: [HACKERS] Tuple sort is broken. It crashes on simple test. Pavel Stehule <pavel.stehule@gmail.com>
Re: [HACKERS] Tuple sort is broken. It crashes on simple test. Peter Geoghegan <pg@heroku.com>
Re: [HACKERS] Tuple sort is broken. It crashes on simple test. Pavel Stehule <pavel.stehule@gmail.com> 
On Mon, Jan 16, 2017 at 3:48 AM, Michael Paquier
 wrote:
> Indeed. It crashes for me immediately by adding an ORDER BY:
> select count(distinct t) from seq_tab order by 1;

The problem was that one particular call to the macro
RELEASE_SLAB_SLOT() happened to lack a test-for-NULL-argument needed
by pass-by-value datum cases. The other two RELEASE_SLAB_SLOT() calls
already have such a check.

Attached patch fixes the bug.

-- 
Peter Geoghegan

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