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Type:
Improvement
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Resolution: Duplicate
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Priority:
Minor - P4
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None
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Affects Version/s: 2.5.1, 2.6.3
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Component/s: Querying
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None
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Query Optimization
It is possible to negate arbitrary expression using the "$nor" expression. This ticket only tracks extending the syntax to allow negating expressions with "$not" as well.
Original description:
$not currently (<=2.5.1) only supports negating equality operators. so i can do { field: { $not : { [$eq,$gt,$lt,...] } }
but there is no way to negate an entire expression.
some example negated expressions (that don't work now):
| Example expression | Logically equivalent to |
|---|---|
| { $not: {a: 1} } | {a: {$ne: 1}} |
| { $not:
{a: 1, b: 2}
|
{$or: [ {a: {$ne: 1}}, {b: {$ne: 2}} ]} |
| { $not: {$and: [ {a: 1}, {b: 2}] } | {$or: [ {a: {$ne: 1}}, {b: {$ne: 2}} ]} |
| { $not: {$or: [ {a:1}, {b:2} ]} | {$and: [ {a: {$ne: 1}}, {b: {$ne: 2}} ]} |
| { a: 1, $not: {b: 2}} | {a: 1, b: {$ne: 2}} |
- duplicates
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SERVER-1454 Use $not as a top-level logical op
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- Backlog
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- is duplicated by
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- Closed
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