Answer
$facet allows running multiple aggregations in parallel on the same input, useful for dashboards requiring different metrics from one dataset.
Quick Answer
$facet runs multiple sub-pipelines on the same input in parallel, each producing a different result in the output. Useful for building faceted search results - one sub-pipeline counts by category, another by price range, another for the actual results. All computed in one aggregation pass instead of multiple queries.
S
SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ