Filtering on a aggregate function - azure-cosmosdb

Question

I am using Azure Cosmos DB and trying to write a query to filter document by Name and version. I am new to Cosmos and it seems the way I'm doing applies the filter per record versus the results themselves. Can anyone tell me the proper way to accomplish this:
select C.*
from c
JOIN (select MAX(c.version) from c where c.name = "test") maxVersion
where maxVersion = c.version
Sample data:
[{"name":"test","verson":1}{"name":"test","verson":2}{"name":"test","verson":3}]
Results:
I get a record back for each version vs the max version. IE I only should get one record back and it's version number should be 3

Answer 1

When you run this SQL:
select c,maxVersion
from c
JOIN (select MAX(c.version) from c where c.name = "test") maxVersion
you will get this document:
{
"c": {
"id": "1",
"name": "test",
"version": 1
},
"maxVersion": {
"$1": 1
}
}
{
"c": {
"id": "2",
"name": "test",
"version": 2
},
"maxVersion": {
"$1": 2
}
},
{
"c": {
"id": "3",
"name": "test",
"version": 3
},
"maxVersion": {
"$1": 3
}
}
Your maxVerson equals to c.version in each document, so you will get multiple documents not one.
According to your requirement, you can try something like this SQL:
SELECT TOP 1 *
FROM c
WHERE c.name = "test"
ORDER BY c.version DESC