range_agg() missing support for multirange inputs

Hello,

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)}

Best,

Ian Campbell