Details
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Type:
New Feature
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Status: Open
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Priority:
Major - P3
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Resolution: Unresolved
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Affects Version/s: None
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Fix Version/s: Backlog
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Component/s: Aggregation Framework
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Labels:
Description
Currently, $group does not allow to have a constant integer in a group clause, on the other hand, it supports strings. For example
db.foo.aggregate([{$group:{_id: {a:"$a", d:1},c: {$sum:"$c"}}}]) |
assert: command failed: { |
"ok" : 0, |
"errmsg" : "$group does not support inclusion-style expressions", |
"code" : 17390, |
"codeName" : "Location17390" |
} : aggregate failed
|
If set d as a string we don't get any error
db.foo.aggregate([{$group:{_id: {a:"$a", d:"1"},c: {$sum:"$c"}}}]) |
In order to be consistent group should support also integer inside _id