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Type: Bug
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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: 3.4.9
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Component/s: Aggregation Framework
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Labels:None
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Environment:Linux and OS X
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ALL
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Query 2017-10-23
The result of a projection using nested keys is different from 3.2 to 3.4.
We had to use `$ifnull` in some cases to avoid this difference of results.
I couldn't find any breaking change listed on 3.4 mentioning this change and I couldn't find any issue that was describing exactly this issue.
We found this after changing our CI to use 3.4
I'm sorry if I missed some documentation explaining this breaking change. Thanks for your attention!
- duplicates
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DOCS-10869 Expand $project changes in 3.2->3.4 compatibility changes
- Closed