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Type:
Task
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Resolution: Won't Do
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Priority:
Major - P3
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Affects Version/s: None
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Labels:None
During the 3.4 development cycle we re-wrote the $project stage. Our compatibility notes already list one $project compatibility change, but there are more that are worth mentioning. Specifically, the following:
{$project: {a: {b: "$missingField"}}} used to be {}, now (3.4+) is {a: {}}
{$project: {'a.b': <expression>}} used to be {'a.b': <result of expression>}, now is an error (field names with dots aren't really supported elsewhere)
_id will always show up in explain output for inclusion projections, even if not explicitly mentioned.
- is duplicated by
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SERVER-31282 $project of nested projection regression 3.2 -> 3.4
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- Closed
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