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Type:
Improvement
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Resolution: Fixed
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Priority:
Major - P3
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Affects Version/s: None
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Component/s: None
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None
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Query Optimization
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Fully Compatible
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SERVER-129906 handled the simplest cases. However, we should also extend the projection-removal logic to remove cases like this one:
[
{$project: {a: {$add: ["$b", "$c"]}, b:1}},
{$group: {_id: "$b"}}
]
The trick here is that the $project involves the $b field that the $group uses, but its output it not read by the $group.
- fixes
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SERVER-129906 Query plan regression for $project before $count
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- Closed
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- is related to
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- Backlog
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- related to
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- Backlog
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