Message-ID: <51CC9746.5060804@dunslane.net>
Date: Thu, 27 Jun 2013 15:49:26 -0400
From: Andrew Dunstan <andrew@dunslane.net>
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To: sthomas@optionshouse.com
CC: Tom Lane <tgl@sss.pgh.pa.us>, Dave Johansen <davejohansen@gmail.com>,
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 "pgsql-performance@postgresql.org" <pgsql-performance@postgresql.org>
Subject: Re: Partitions not Working as Expected
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On 06/27/2013 03:14 PM, Shaun Thomas wrote:
> On 06/27/2013 01:42 PM, Tom Lane wrote:
>
>> That will break things: CURRENT_DATE will then be equivalent to just
>> writing today's date as a literal.
>
> Interesting. I tested it by creating a view and a table with a 
> default, and it always seems to get translated to:
>
> ('now'::text)::date
>
> But I'll take your explanation at face value, since that doesn't imply 
> what the output would be. What's interesting is that EnterpriseDB has 
> their own pg_catalog.current_date function that gets called by the 
> CURRENT_DATE keyword. So unlike in vanilla PG, I could mark just the 
> current_date function as immutable without affecting a lot of other 
> internals.
>
> On EDB, this actually works:
>
> UPDATE pg_proc
>    SET provolatile = 'i'
>  WHERE proname = 'current_date';


But that's a lie, surely. If it breaks you have nobody to blame but 
yourself. There's a reason EDB haven't marked their function immutable - 
it's not.

cheers

andrew


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