Feature Request (SUMSTR)

Hi,

here is my problem:

i have a table with countries.
but on my report i need these countries in one row.

the result should look like: AT,DE,UK,US

so i thought, that the aggregate-function SUM could solve my problem.
but with the normal SUM, the result looked like this:
ATDEUKUS
or with an expression:
AT,DE,UK,US,

So it would be great, to have an aggregate function called like SUMSTR,
where one could define a separator-string:
so a call of this function would look like:
SUMSTR(<expression>,<separator>)

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