Azure Cosmos DB aggregation over nested structure - azure

Question

I have an azure cosmos DB with documents as below
{
"id": "id_1",
"location": "location_1",
"colorCounts": {
"red" : 1,
"blue": 0,
"yellow": 1
}
},
{
"id": "id_2",
"location": "location_1",
"colorCounts": {
"red" : 0,
"blue": 0,
"yellow": 0
}
}
and want make a query that groups the results by location while averaging all the values in colorCounts. My result would look like this:
{
"location": "location_1",
"colorCounts": {
"red" : 0.5,
"blue": 0,
"yellow": 0.5
}
}
When I try to average over colorCounts:
SELECT c.id, c.location, AVG(c.colorCounts) FROM c GROUP BY c.location
I do not get any color counts. I can average over single colors, but I do not know how to average over the nested object colorCounts.

Answer 1

Script:
select a.location,{"red" : a.red, "blue": a.blue
,"yellow": a.yellow} as colorCounts FROM
(SELECT c.location,avg(c.colorCounts.red) as red,
avg(c.colorCounts.blue) as blue,
avg(c.colorCounts.yellow) as yellow FROM c
GROUP by c.location)a
I tried to repro this with the same sample input and got the required output.
Output:
[
{
"location": "location_1",
"colorCounts": {
"red": 0.5,
"blue": 0,
"yellow": 0.5
}
}
]