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Type:
Bug
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Resolution: Works as Designed
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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: Querying
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Query Optimization
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ALL
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QE 2023-07-24, QE 2023-08-07
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3
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According to docs: https://docs.mongodb.com/manual/core/query-plans/#index-filters, Index Filters always override hints. However, according to the code path starting here $natural hint overrides index filters.
db.c.insert({a : 1})
db.runCommand({planCacheSetFilter: "c", query: {}, indexes: [{ a : 1 }]});
db.c.aggregate({$group: {_id: "$a"}})
db.c.explain().aggregate({$group: {_id: "$a"}})
db.c.explain().aggregate([{$group: {_id: "$a"}}], {hint: {$natural: 1}})
Log Level 5 shows "Forcing a table scan due to hinted $natural".
- is related to
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- Closed
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SERVER-62985 Change query planner to generate column index plans when hinted
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- Closed
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- Closed
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