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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Tomas Vondra <tomas.vondra@2ndquadrant.com>
Cc: PostgreSQL-development <pgsql-hackers@postgresql.org>
Subject: Re: [HACKERS] user-defined numeric data types triggering ERROR: unsupported type
Date: Sun, 04 Mar 2018 11:59:42 -0500
Message-ID: <15879.1520182782@sss.pgh.pa.us> (raw)
In-Reply-To: <82f29126-df5a-d4bc-f5b5-47233e29aaa6@2ndquadrant.com>
References: <b68441b6-d18f-13ab-b43b-9a72188a4e02@2ndquadrant.com>
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	<4b444362-4240-49e0-3523-724e5932b060@2ndquadrant.com>
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	<d526eb53-dbd6-d414-8e5d-21e644ce4549@2ndquadrant.com>
	<14597.1520038563@sss.pgh.pa.us>
	<42f4e37e-f923-6ea9-4172-cdec5a8c2d25@2ndquadrant.com>
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	<11916.1520127473@sss.pgh.pa.us>
	<82f29126-df5a-d4bc-f5b5-47233e29aaa6@2ndquadrant.com>

Tomas Vondra <tomas.vondra@2ndquadrant.com> writes:
> On 03/04/2018 02:37 AM, Tom Lane wrote:
>> I was kind of underwhelmed with these test cases, too, so I didn't
>> commit them.  But they were good for proving that the bytea bug
>> wasn't hypothetical :-)

> Underwhelmed in what sense? Should the tests be constructed in some
> other way, or do you think it's something that doesn't need the tests?

The tests seemed pretty ugly, and I don't think they were doing much to
improve test coverage by adding all those bogus operators.  Now, a look at
https://coverage.postgresql.org/src/backend/utils/adt/selfuncs.c.gcov.html
says that our test coverage for convert_to_scalar stinks, but we could
(and probably should) improve that just by testing extant operators.

A concrete argument for not creating those operators is that they pose a
risk of breaking concurrently-running tests by capturing inexact argument
matches (cf CVE-2018-1058).  There are ways to get around that, eg run
the whole test inside a transaction we never commit; but I don't really
think we need the complication.

			regards, tom lane




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