create type- similar char

From: Mohsen SM <mohsensoodkhah(at)gmail(dot)com>
To: pgsql-hackers(at)postgresql(dot)org
Subject: create type- similar char
Date: 2014-03-16 13:41:54
Message-ID: CAGT6x6eaw0bPKOxN87zGjXQrjmrANbq+FEbJub1jrDVp4T_7eA@mail.gmail.com
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I create one new type with CREATE TYPE command.
for my type its INTERNALLENGTH is VARIABLE .
but I want to my type behavior similar to char and when I type this query:
CREATE TABLE tbl (col1 NEWTYPE);
then when I write this query, so it get an error for it's length:
insert into tbl values('dd');
its error is :
ERROR: value too long for type character(1)
but my NEWTYPE don't get this error and work similar to varchar.
how I can do it?
I check for char type the bpchar() function. when I work with char type and
want to insert one word longest one character so, bpchar() called.
but for my NEWTYPE don't call the newtype() function.
how can I correct this problem?

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