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From: Jonathan S. Katz <jkatz@postgresql.org>
To: Michael Paquier <michael@paquier.xyz>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: David Rowley <dgrowleyml@gmail.com>
Cc: exclusion@gmail.com
Cc: pgsql-bugs@lists.postgresql.org
Subject: Re: BUG #18240: Undefined behaviour in cash_mul_flt8() and friends
Date: Fri, 12 Jan 2024 11:19:08 -0500
Message-ID: <9115f2e8-8dde-4545-868c-9becb2260aef@postgresql.org> (raw)
In-Reply-To: <ZZ9AdxEEwHD8CWJ5@paquier.xyz>
References: <ZXgh74Ykj3iWvXKr@paquier.xyz>
	<CAApHDvrBLa=gQ0tCg8727RaZXWDg1sDvFJ2+-DVy5SC=NSSKkg@mail.gmail.com>
	<2433182.1702391878@sss.pgh.pa.us>
	<ZX1rmhppwgaczYQ7@paquier.xyz>
	<3453263.1702739958@sss.pgh.pa.us>
	<ecdf4a19-e97d-42c8-be45-fb5a46166160@postgresql.org>
	<1673413.1703442075@sss.pgh.pa.us>
	<ZYjSZZu1UGUlXWXa@paquier.xyz>
	<ZYlSJREbhM_qNZIT@paquier.xyz>
	<1851211.1703519939@sss.pgh.pa.us>
	<ZZ9AdxEEwHD8CWJ5@paquier.xyz>

On 1/10/24 8:12 PM, Michael Paquier wrote:

> While looking at the whole picture, an issue with the direct removal
> of money is how we should handle btree_gin and btree_gist which have
> operators based on money.  We try to keep things compatible at
> run-time, but could this be worth a hard break in these modules,
> dropping the older sql scripts used in the modules if we don't have
> access to money anymore at runtime?  These are not popular modules..
> Any thoughts about that?

Both modules are pretty popular. Personally, I used it in scheduling 
apps that involved range types + exclusion constraints. The data I've 
seen suggests btree_gist / btree_gin are widely deployed.

That said, I don't know how much of these modules are used with the 
money type specifically. My guess is that it's more common to combine it 
with something like an {int,bool}/range type than a money type.

It sounds like we'd have to tread a bit lightly because of this, even if 
money is not frequently (or at all) used with btree_gist/gin?

Jonathan


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