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Type:
New Feature
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Resolution: Duplicate
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Priority:
Major - P3
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None
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Affects Version/s: 3.5.6
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Component/s: Aggregation Framework
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Query Optimization
When performing an aggregation query in mongodb, it would sometimes be useful to reference the previous document. As we have the `$$ROOT` variable, perhaps we could have `$$PREVIOUS` or some other meaningful name that let's us do document to document calculations.
A possible use case would be calculating time passed in between documents more easily, and calculating deltas between documents.
- duplicates
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SERVER-54243 Desugar $shift window function to $first with one-document window
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- Closed
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- is related to
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- Closed
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- Closed
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SERVER-29339 allow using $reduce expression as accumulator in $group
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- Backlog
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