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Type:
Question
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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: Query Execution
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Fully Compatible
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v5.0
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Query Execution 2021-07-26, QE 2021-08-09, QE 2021-08-23, QE 2021-09-06, QE 2021-09-20
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On the legacy query engine (4.4, 5.0 with internalQueryForceClassicEngine), passing on a filter object with the form
{"": null} evaluates as true and returns all docs.
However on the new query engine it evaluates as false.
This was observed by a test case with the Go Driver passing bson.D{{}} as the filter.
Changing to bson.D{} (which translates to filter: {}) works around the issue.
- is related to
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SERVER-59757 Evaluate supporting queries with match expressions on empty field names in SBE
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- Closed
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- related to
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SERVER-64123 $elemMatch value predicate causes queries to accidentally fall back to the classic engine
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- Closed
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SERVER-57758 Turn SBE off by default and invert the sense of the internalQueryForceClassicEngine flag
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- Closed
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