On Thu, Apr 30, 2020 at 11:40:59PM +0900, Fujii Masao wrote: > Also the number of bytes can be added into and substracted from LSN using the > <literal>+(pg_lsn,numeric)</literal> and <literal>-(pg_lsn,numeric)</literal> > operators, respectively. Note that the calculated LSN should be in the range > of <type>pg_lsn</type> type, i.e., between <literal>0/0</literal> and > <literal>FFFFFFFF/FFFFFFFF</literal>. > -----------------
That reads fine.
>> + /* XXX would it be better to return NULL? */
>> + if (NUMERIC_IS_NAN(num))
>> + ereport(ERROR,
>> + (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
>> + errmsg("cannot convert NaN to pg_lsn")));
>> That would be good to test, and an error sounds fine to me.
>
> You mean that we should add the test that goes through this code block,
> into the regression test?
Yes, that looks worth making sure to track, especially if the behavior
of this code changes in the future.
--
Michael
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