Re: Append to a GUC parameter ?

Alvaro Herrera-9 wrote
> Bruce Momjian wrote:
>> On Tue, Aug 5, 2014 at 12:52:51PM -0700, Josh Berkus wrote:
>> > On 08/05/2014 11:12 AM, Jerry Sievers wrote:
>> > > shared_preload_libraries += auto_explain
>> > >
>> > > Would do the trick.
>> > >
>> > > I've never heard this mentioned before so presume not many have
>> > > contemplated this.
>> >
>> > It's been discussed.
>> >
>> > However, other than shared_preload_libraries, I can't think of a GUC
>> > which would benefit from this. Can you?
>>
>> search_path?
>
> Almost anything that's marked GUC_LIST_INPUT. A quick grep shows some
> variables for which it doesn't make sense, such as DateStyle, and others
> for which it would, such as temp_tablespaces, synchronous_standby_names,
> listen_addresses, and the various preload_libraries params. Not sure
> about log_destination.
>
> I think this merits a new GUC flag, say GUC_LIST_ADDITIVE.

Would that allow, without any special syntax, multiple declarations of, say,
shared_preload_libraries, to have their values appended instead of the most
(or least, I forget which) recent one overwrite (or be ignored by) the
existing value?

The idea of requiring "+=" instead of just "=" is not particularly
appealing...

David J.

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