From: pgsql-hackers-owner@postgresql.org
> [mailto:pgsql-hackers-owner@postgresql.org] On Behalf Of Robert Haas
> Let me try to be more clear. I will not commit this patch if it is not
> properly commented. I doubt that anyone else will, either.
>
> The fact that those code changes already exist in 9.4+ is not a reason to
> back-port them to earlier releases without a proper explanation of why we
> are doing it. Very possibly, we should also improve the comments in newer
> branches so that future authors don't reintroduce whatever bugs were fixed
> by these changes. But whether we do that or not, I am not going to commit
> uncommented patches to complex code in order to fix obscure bugs in
> 3+-year-old branches. I think that is a non-starter.
>
OK, although I'm not perfectly sure what to add as a comment, I added an example scenario as a comment because I
thoughta concrete situation helps to understand the existing two paragraphs. Is this good?
Regards
Takayuki Tsunakawa