> I decided to use the int4 sorting routines when the type is
> "InvalidOid", the type apparently assigned to null constants. The sort
> routines probably don't get called anyway since everything is a null,
> and if they did the "pass by value" int4 routines are probably safest.
Good. That was my suspicion on how to do it.
What does 'select null order by 1;' do now?
I have renamed the append struct names just now as part of an EXPLAIN
fix. Should not affect you.
>
> Will continue testing, and need to look into this still:
>
> postgres=> select 1 union select null union all select null;
> Backend message type 0x44 arrived while idle
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