Re: TAP test utility module 'PG_LSN.pm'

On 2020/12/01 14:58, Michael Paquier wrote:
> On Tue, Dec 01, 2020 at 12:03:41PM +0800, Craig Ringer wrote:
>> I'd like to share the attached PG_LSN.pm module that I use when
>> writing TAP tests. I suggest that it be considered for inclusion in
>> core.
>>
>> It defines a Perl datatype PG_LSN with operator support, so you can
>> write things like
>>
>>      cmp_ok($got_lsn, "<", $expected_lsn, "testname")
>>
>> in TAP tests and get sensible results without any concern for LSN
>> representation details, locale, etc. You can subtract LSNs to get a
>> byte difference too.
> 
> In my experience, any TAP tests making use of LSN operations can just
> let the backend do the maths, so I am not much a fan of duplicating
> that stuff in a perl module.

Agreed.

> Wouldn't it be better to add an
> equivalent of your add() function in the backend then?

You mean the same function as the commit 9bae7e4cde provided?

Regards,

-- 
Fujii Masao
Advanced Computing Technology Center
Research and Development Headquarters
NTT DATA CORPORATION