Details
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Bug
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Status: Backlog
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Major - P3
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Resolution: Unresolved
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None
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None
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Query Optimization
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ALL
Description
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".
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