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Re: query slowness caused by table alias

From: Peter Eisentraut <e99re41(at)DoCS(dot)UU(dot)SE>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: Chi Fan <chifungfan(at)yahoo(dot)com>, bugs(at)postgresql(dot)org
Subject: Re: query slowness caused by table alias
Date: 2000-05-05 09:41:19
Message-ID: Pine.GSO.4.02A.10005051140150.18780-100000@Gepard.DoCS.UU.SE (view raw or flat)
Thread:
Lists: pgsql-bugs
On Thu, 4 May 2000, Tom Lane wrote:

> > EXPLAIN 
> > SELECT * 
> > FROM part p              -- let p alias to part
> > WHERE part.part_id = 42; -- but don't use p
> 
> > Nested Loop  (cost=0.00..2429.30 rows=50735 width=219)
> >   -> Index Scan using part_pkey on part (cost=0.00..3.60 rows=1 width=4)
> >   -> Seq Scan on part p  (cost=0.00..1918.35 rows=50735 width=215)
> 
> This is correct behavior.

Isn't it time we disable this by default or at least provide an option for
it? It seems this comes up every week.

-- 
Peter Eisentraut                  Sernanders väg 10:115
peter_e(at)gmx(dot)net                   75262 Uppsala
http://yi.org/peter-e/            Sweden


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