I have few questions about new aggregation framework.
Question 1. Does non-existence of a field considered as $min value in a
For e.g. In the following script, min_metric2 is not printed because
var result = db.metric.aggregate
}Question 2: How do I set a fixed String (hard-coded value) to a field in
$project or anywhere else in the pipeline?
Question 3: Is it possible to define a field conditionally (based on a
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