Re: BUG: text(varchar) truncates at 31 bytes

I can confirm this problem exists in current sources. Quite strange.

> #create table t (v varchar);
> #insert into t values ('0123456789a0123456789b0123456789c0123456789d');
>
> #select v from t;
>
> v
> ----------------------------------------------
> 0123456789a0123456789b0123456789c0123456789d
> (1 row)
>
> So far, so good.
>
> #select text(v) from t;
>
> text
> ---------------------------------
> 0123456789a0123456789b012345678
> (1 row)
>
> Truncation occurs.
>
> Work around:
>
> # select v::text from t;
> ?column?
> ----------------------------------------------
> 0123456789a0123456789b0123456789c0123456789d
> (1 row)
>
> I couldnt figure out what happens during a text(varchar) call. I looked
> around in pg_proc, but couldnt find the function. There's probably an
> automagic type conversion going on or something.
>
> Could someone explain what all the internal varchar-like types are (ie.
> varchar,varchar(n),text,char,_char,bpchar) and when they're used? I
> find it all really confusing - I'm sure others do too.
>
> Is there anyway to determine what postgresql is doing in its automagic
> function calls? I guess I'm asking for an EXPLAIN that describes
> function calls. For example,
> EXPLAIN select text(v) from t;
>
> --> {Description of conversion from varchar to whatever the text()
> function actually works on}
>
>
> Thanks,
> dave
>
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--
Bruce Momjian | http://candle.pha.pa.us
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