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


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