| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> |
| Cc: | Michael Paquier <michael(at)paquier(dot)xyz>, "Tsunakawa, Takayuki" <tsunakawa(dot)takay(at)jp(dot)fujitsu(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org> |
| Subject: | Re: removal of dangling temp tables |
| Date: | 2018-12-28 16:35:39 |
| Message-ID: | 30125.1546014939@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> writes:
> On 2018-Dec-28, Alvaro Herrera wrote:
>> On 2018-Dec-28, Michael Paquier wrote:
>>> There are many exotic extensions which could be using sizeof(PGPROC)
>>> as that's a popular structure,
>> Can you show one instance of this?
> I looked at
> https://github.com/postgrespro/pg_wait_sampling/blob/master/pg_wait_sampling.c
> https://github.com/citusdata/citus/search?q=pgproc&unscoped_q=pgproc
> and skimmed a few others can't find any instance where the full struct
> is used, as opposed to just a pointer to it.
No, the point Michael is making is that the array stride in the ProcArray
is part of our ABI. For example, accessing a PGPROC from its pgprocno
using the GetPGProcByNumber macro will be broken if we change the
struct size. I do not think you can assume that no extension does that.
regards, tom lane
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