| From: | Marko Tiikkaja <marko(dot)tiikkaja(at)cs(dot)helsinki(dot)fi> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Writeable CTEs and empty relations |
| Date: | 2010-02-09 05:32:44 |
| Message-ID: | 4B70F37C.2000808@cs.helsinki.fi |
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| Thread: | |
| Lists: | pgsql-hackers |
On 2010-02-09 01:09 +0200, Tom Lane wrote:
> Marko Tiikkaja <marko(dot)tiikkaja(at)cs(dot)helsinki(dot)fi> writes:
>> I traced this down to heapam.c, which has this:
>> ...
>> This doesn't exactly work anymore since we modify the snapshot after
>> calling ExecInitScan().
>
> So don't do that. The executor is generally entitled to assume that
> parameters given to ExecutorStart are correct. In particular, changing
> the snapshot after the query has started to run seems to me to ensure
> all sorts of inconsistent and undesirable behavior.
You do remember that the whole patch in its current form depends on
modifying the snapshot?
Regards,
Marko Tiikkaja
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