text and varchar

Lists: pgsql-hackers
From: Dennis Bjorklund <db(at)zigo(dot)dhs(dot)org>
To: pgsql-hackers(at)postgresql(dot)org
Subject: text and varchar
Date: 2004-07-21 15:52:13
Message-ID: Pine.LNX.4.44.0407211748080.2838-100000@zigo.dhs.org
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Why do we have both the type text and type varchar (without limit)?
Couldn't we make one to be an alias for the other?

Since it's 2 distinct types there are some strange effects:

dennis=> SELECT CAST ('123'::varchar AS integer);
ERROR: cannot cast type character varying to integer

dennis=> SELECT CAST ('123'::text AS integer);
int4
------
123

Sure, the cast is simple to fix. But why do we have two types in the first
place?

--
/Dennis Björklund