Re: Numeric 508 datatype

From: Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: Alvaro Herrera <alvherre(at)commandprompt(dot)com>, Simon Riggs <simon(at)2ndquadrant(dot)com>, pgsql-patches(at)postgresql(dot)org
Subject: Re: Numeric 508 datatype
Date: 2005-12-02 21:19:20
Message-ID: 200512022119.jB2LJKA23262@candle.pha.pa.us
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Tom Lane wrote:
> Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> writes:
> > Tom Lane wrote:
> >> If that gives the right answer then the NUMERIC code is off the hook,
> >> and what you've got is a strange limitation on output column length.
>
> > test=> select length((pow(10::numeric, 131071))::text);
> > length
> > --------
> > 131089
> > (1 row)
>
> > Looks good. From psql I just tried:
>
> > SELECT repeat('x', 4000);
>
> > and got 4k x's, and SELECT repeat('x', 8000) returns 8k x's, so that works.
>
> Curiouser and curiouser. How about if you repeat 4k or 8k '1's? If the

1's print just fine too.

> behavior is different for letters and digits then I'd look at the column
> justification logic in psql's printing code.

Again, I checked on a stand-alone backend and saw the same failures, so
it isn't psql.

Wow, check this out:

test=> SELECT CAST (pow(10::numeric, 10000) + 1 AS TEXT)

It works fine! I have all the digits, and the trailing 1.0:

000001.0000000000000000

while SELECT pow(10::numeric, 10000) fails.

--
Bruce Momjian | http://candle.pha.pa.us
pgman(at)candle(dot)pha(dot)pa(dot)us | (610) 359-1001
+ If your life is a hard drive, | 13 Roberts Road
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