Doc: explain that "timestamp - timestamp" applies justify_hours().
Back-patch to v13; before that, there's not really space for this
kind of detail.
Discussion:
@@ -8412,11 +8412,12 @@ SELECT regexp_match('abc01234xyz', '(?:(.*?)(\d+)(.*)){1,1}');
<returnvalue>interval</returnvalue>
</para>
<para>
- Subtract timestamps
+ Subtract timestamps (converting 24-hour intervals into days,
+ similarly to <function>justify_hours()</function>)
</para>
<para>
- <literal>timestamp '2001-09-29 03:00' - timestamp '2001-09-27 12:00'</literal>
- <returnvalue>1 day 15:00:00</returnvalue>
+ <literal>timestamp '2001-09-29 03:00' - timestamp '2001-07-27 12:00'</literal>
+ <returnvalue>63 days 15:00:00</returnvalue>
</para></entry>
</row>
