Re: [BUGS] Bug #513: union all changes char(3) column definition

> regression=# create table baz as select f1 || 'z' as f1 from foo;
> SELECT
> regression=# \d baz
>          Table "baz"
>  Column |  Type  | Modifiers
> --------+--------+-----------
>  f1     | bpchar |
> 
> The argument here is about how much intelligence it's reasonable to
> expect the system to have.  It's very clearly not feasible to derive
> a length limit automagically in every case.  How hard should we try?

I don't think we can try in this case, especially because our functions
are all burried down in adt/.  However, I don't think creating a bpchar
with no length is a proper solution.  Should we just punt to text in
these cases?  Seems cleaner, perhaps even throw an elog(NOTICE)
mentioning the promotion to text.

--  Bruce Momjian                        |  http://candle.pha.pa.us pgman@candle.pha.pa.us               |  (610)
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