Re: Time delayed LR (WAS Re: logical replication restrictions)

At Mon, 23 Jan 2023 17:36:13 +0530, Amit Kapila <amit.kapila16@gmail.com> wrote in 
> On Sun, Jan 22, 2023 at 6:12 PM Takamichi Osumi (Fujitsu)
> <osumi.takamichi@fujitsu.com> wrote:
> >
> >
> > Attached the updated patch v19.
> Few comments:
> 2.
> + if (IsSet(supported_opts, SUBOPT_MIN_APPLY_DELAY) &&
> + opts->min_apply_delay > 0 && opts->streaming == LOGICALREP_STREAM_PARALLEL)
> + ereport(ERROR,
> + errcode(ERRCODE_SYNTAX_ERROR),
> + errmsg("%s and %s are mutually exclusive options",
> +    "min_apply_delay > 0", "streaming = parallel"));
>  }
> 
> I think here we should add a comment for the translator as we are
> doing in some other nearby cases.

IMHO "foo > bar" is not an "option".  I think we say "foo and bar are
mutually exclusive options" but I think don't say "foo = x and bar = y
are.. options".  I wrote a comment as "this should be more like
human-speaking" and Euler seems having the same feeling for another
error message.

Concretely I would spell this as "min_apply_delay cannot be enabled
when parallel streaming mode is enabled" or something. And the
opposite-direction message nearby would be "parallel streaming mode
cannot be enabled when min_apply_delay is enabled."

regards.

-- 
Kyotaro Horiguchi
NTT Open Source Software Center