Richard Hansen via Postfix-devel:
> On 2025-06-11 22:26:43-04:00, Wietse Venema via Postfix-devel wrote:
> > An empty lookup result is generally not allowed in Postfix. It's
> > enforced in maps_find(), instead of in each indiividual dict_xxx.c
> > implementation.
>
> Gotcha. I think it would be worth mentioning this in DATABASE_README; I
> can draft something if you agree.
Fine.
> Would it be useful to add empty string checks to unionmap and pipemap?
> Or is that just more complexity for little value?
This was an omission when I added union/pipe/etc map support,
at a time that Postfix was 15 years old.
Principle: if we don't have an empty result check in every table,
then have it in the layer above (maps_find(), dict_union_lookup()
etc.). That will do for now.
Wietse
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