[SERVER-45829] Allow agg layer to request PlanStage layer to return document Created: 28/Jan/20 Updated: 06/Dec/22 |
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| Status: | Backlog |
| Project: | Core Server |
| Component/s: | Querying |
| Affects Version/s: | None |
| Fix Version/s: | None |
| Type: | Improvement | Priority: | Major - P3 |
| Reporter: | Ian Boros | Assignee: | Backlog - Query Execution |
| Resolution: | Unresolved | Votes: | 0 |
| Labels: | None | ||
| Remaining Estimate: | Not Specified | ||
| Time Spent: | Not Specified | ||
| Original Estimate: | Not Specified | ||
| Assigned Teams: |
Query Execution
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| Sprint: | Query 2020-02-10, Query 2020-02-24, Query 2020-03-09, Query 2020-03-23 |
| Participants: |
| Description |
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When there is a finite dependency set, the query system often computes a projection on a BSONObj, returning another BSONObj. In agg, this BSONObj turned into a (lazy) Document, which again copies fields out of the BSON upon individual field access. We could avoid repeating some work if the find() layer produced a Document in these cases instead. Queries with no finite dependency set will continue to use the "lazy" document behavior. |