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Re: cast from integer to money

From: Robert Haas <robertmhaas(at)gmail(dot)com>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: Joseph Adams <joeyadams3(dot)14159(at)gmail(dot)com>, Stephen Frost <sfrost(at)snowman(dot)net>, Kevin Grittner <Kevin(dot)Grittner(at)wicourts(dot)gov>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: cast from integer to money
Date: 2011-04-04 15:01:15
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Lists: pgsql-hackers
On Mon, Apr 4, 2011 at 10:58 AM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> Robert Haas <robertmhaas(at)gmail(dot)com> writes:
>> On Apr 4, 2011, at 1:46 AM, Joseph Adams <joeyadams3(dot)14159(at)gmail(dot)com> wrote:
>>> On Sun, Apr 3, 2011 at 11:23 PM, Robert Haas <robertmhaas(at)gmail(dot)com> wrote:
>>>> Thanks for the patch, but I think you forgot to worry about overflow:
>>> cash_in doesn't test for overflow, either (tested on 8.4.0, 9.0.3, and HEAD):
>>> Is this a bug?
>> Seems like it. You have to feel sorry for the guy who deposits 9 quintillion dollars and then gets a note from the bank saying his account is overdrawn...
> I'm fairly sure that *none* of the money operations bother to check for
> overflow; not only input, but arithmetic.  That falls somewhere between
> bug and missing feature.  It's probably worth fixing but seems outside
> the scope of the current patch.

Oh.  Bummer.  Yeah, that sounds more like a TODO than an open item.

> In the meantime, I'm not sure whether the newly added functions should
> be held to a higher standard than the existing ones.  It might be better
> to leave it be, and plan to fix them all at once in a consistent style.

Maybe.  The numeric->money cast does handle it though, so there's at
least some precedent for checking.  If you don't want to worry about
it, I'm OK with just putting it in as-is, but I'd probably be inclined
to look for a way to fix it if we can do that without adding too much

Robert Haas
The Enterprise PostgreSQL Company

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