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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 20:59:36
Message-ID: 200512022059.jB2Kxah20441@candle.pha.pa.us (view raw or flat)
Thread:
Lists: pgsql-generalpgsql-hackerspgsql-patches
Tom Lane wrote:
> Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> writes:
> > I just tested from a standalone backend:
> > 	backend> select pow(10::numeric, 131071) + 1
> > and got 4095 zeros and no trailing '1' (wrong), so it isn't psql, it
> > must be something in the backend.
> 
> If the backend is truncating the result length, I don't see why psql
> would decide it needs 12K dashes for the header.  There's something
> awfully fishy going on in your machine.
> 
> Try something like
> 
> regression=# select length((pow(10::numeric, 131071))::text);
>  length
> --------
>  131089
> (1 row)
> 
> 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.

-- 
  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
  +  Christ can be your backup.        |  Newtown Square, Pennsylvania 19073

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