Re: Rewrite, normal execution vs. EXPLAIN ANALYZE

From: Marko Tiikkaja <marko(dot)tiikkaja(at)cs(dot)helsinki(dot)fi>
To: David Fetter <david(at)fetter(dot)org>
Cc: pgsql-hackers(at)postgresql(dot)org
Subject: Re: Rewrite, normal execution vs. EXPLAIN ANALYZE
Date: 2010-07-23 18:13:18
Message-ID: 4C49DBBE.5000408@cs.helsinki.fi
Views: Raw Message | Whole Thread | Download mbox | Resend email
Thread:
Lists: pgsql-hackers

On 7/23/2010 8:52 PM, David Fetter wrote:
> On Thu, Jul 22, 2010 at 08:43:35PM +0300, Marko Tiikkaja wrote:
>> Did I misunderstand the code? And if I didn't, why do we do this
>> differently?
>
> You mentioned in IRC that this was in aid of getting wCTEs going. How
> are these things connected?

Currently, I'm trying to make wCTEs behave a bit like RULEs do. But if
every rewrite product takes a new snapshot, wCTEs will behave very
unpredictably.

But because EXPLAIN ANALYZE does *not* take a new snapshot for every
rewrite product, I'm starting to think that maybe this isn't the
behaviour we wanted to begin with?

Regards,
Marko Tiikkaja

In response to

Responses

Browse pgsql-hackers by date

  From Date Subject
Next Message Dimitri Fontaine 2010-07-23 18:34:19 Re: patch: to_string, to_array functions
Previous Message David Fetter 2010-07-23 17:52:39 Re: Rewrite, normal execution vs. EXPLAIN ANALYZE