'Aggregating firestore collectionGroups (e.g. find root document maximum)
I use Firestore JavaScript v9. I have a data structure of items with deeply nested tasks, like this:
- item A
- task1
- task1.1
- task2
- task1
- item B
- task1
- task2
- task2.1
- task2.1.1
- task2.1
Every Task has an endDate Timestamp and a subcollection "subTasks".
How can I query the max / latest endDate of all subTasks within an item?
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