Re: Fix comments of heap_prune_chain()

On 2021/07/13 5:57, Matthias van de Meent wrote:
> 
> 
> On Mon, 12 Jul 2021 at 13:14, <ikedamsh@oss.nttdata.com
> <mailto:ikedamsh@oss.nttdata.com>> wrote:
>>
>> Hi,
>>
>> While I’m reading source codes related to vacuum, I found comments which
>> don’t seem to fit the reality. I think the commit[1] just forgot to fix them.
>> What do you think?
> 
> Hmm, yes, those are indeed some leftovers.
> 
> Some comments on the suggested changes:
> 
> 
> - * caused by HeapTupleSatisfiesVacuum.  We just add entries to the arrays in
> + * caused by heap_prune_satisfies_vacuum.  We just add entries to the arrays in
> 
> I think that HeapTupleSatisfiesVacuumHorizon might be an alternative correct
> replacement here.
> 
> 
> -                elog(ERROR, "unexpected HeapTupleSatisfiesVacuum result");
> +                elog(ERROR, "unexpected heap_prune_satisfies_vacuum result");
> 
> The type of the value is HTSV_Result; where HTSV stands for
> HeapTupleSatisfiesVacuum, so if we were to replace this, I'd go for
> "unexpected result from heap_prune_satisfies_vacuum" as a message instead.

Thanks for your comments. I agree your suggestions.

I also updated prstate->vistest to heap_prune_satisfies_vacuum of v1 patch
because heap_prune_satisfies_vacuum() tests with not only prstate->vistest but
also prstate->old_snap_xmin. I think it's more accurate representation.

Regards,
-- 
Masahiro Ikeda
NTT DATA CORPORATION