Fwd: range_agg() missing support for multirange inputs

*Moderator:* I have submitted this bug report twice, but it has never made
it onto the forum and I've never had feedback on it.

All my other reports have been rapidly responded to.

Please advise.

---------- Forwarded message ---------
From: Ian R. Campbell <ian(dot)campbell(at)thepathcentral(dot)com>
Date: Thu, 25 Nov 2021 at 00:13
Subject: range_agg() missing support for multirange inputs
To: <pgsql-bugs(at)lists(dot)postgresql(dot)org>

Consider the following code:

with a(x) as(

values

('{[10,20],[100,200]}'::int4multirange)

,('{[20,40],[15,55],[100,200]}'::int4multirange)

)

select range_agg(x)

from (

select unnest(x)x

from a

)t;

=> {[10,56),[100,201)}

Here, range_agg() won’t accept a multirange type input, but it outputs a
multirange type.

The only way to aggregate the source multirange rows is to unnest them
first.

However, range_intersect_agg() does not require the unnest step:

with a(x) as(

values

('{[10,20],[100,200]}'::int4multirange)

,('{[20,40],[15,55],[100,200]}'::int4multirange)

)

select range_intersect_agg(x)

from a;

=> {[15,21),[100,201)}

Ian Campbell