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Type:
Task
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Resolution: Unresolved
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Priority:
Major - P3
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None
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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
1. If we have a positive predicate and {$exists: true} in one conjunction we can remove {$exists: true}. E.g.
{a: {$eq: 1, $exists: true}} == {a: 1}
2. The same idea with {$ne: null}:
{a: {$eq: 1, $ne: null}} == {a: 1}
3. A positive predicate and {$exists: false}:
{a: {$eq: 1, $exists: false}} == {$alwaysFalse: true}
4. A negative predicate and {$exists: false}:
{a: {$ne: 1, $exists: false}} == {a: {$ne: 1}}
- related to
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SERVER-35018 remove unnecessary FETCH from plan when fetch tests condition that's implied by indexed condition
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- Backlog
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- split from
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- Closed
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