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Type:
Task
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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: None
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Labels:None
Documentation Request Summary:
The release notes list this ticket as a known issue in 3.6.0:
https://docs.mongodb.com/manual/release-notes/3.6/#known-issues-in-3-6-0
We will likely backport this fix, probably targeting 3.6.3. Do we need to do anything in the docs to reflect that the known issue has been resolved?
Engineering Ticket Description:
I am doing following aggregation to join two collection using foreign pipeline.
It seems match stage is not using index at all.
db.blogpost.aggregate([
{ $lookup: {
from: 'comment',
let: { blogpost_id: "$_id" },
pipeline: [ {
$match: { $expr: { $eq: [ "$blogpost.id", "$$blogpost_id"] } }
} ],
as: 'comments'
}}
])
- documents
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SERVER-31760 Lookup sub-pipeline is not using index for equality match
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- Closed
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- related to
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- Closed
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