Details
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New Feature
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Status: Resolved
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Major
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Resolution: Fixed
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Description
MongoDB provides the aggregation pipeline framework for multi-stage data processing. Currently, the query engine invokes this framework to apply individual statement patterns (using a "$match" expression for each and iterating through the results), then applies higher-level query operations (join, filter, select, project, etc) client-side.
In principle, those high-level query operations could be rewritten as aggregation pipeline stages as well ($group, $match, $project, etc). This would allow more query evaluation logic to be executed by the MongoDB server itself, enabling server-side optimization. This could be used as a general query optimization, but would additionally be useful for any tool that only needed to write query results back to the server: adding a write step to the end of the resulting pipeline could obviate the need to communicate individual results to the client at all.
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