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Type:
Improvement
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Resolution: Done
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Priority:
Minor - P4
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Affects Version/s: None
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Component/s: Aggregation Framework
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Doing a group without an _id or with a $ operator - returns the errmsg with the field name truncated to first char:
In the shell:
> db.test.aggregate({$group: {bad_id: 1}})
{
"errmsg" : "exception: the group aggregate field bmust be defined as an expression inside an object",
"code" : 15951,
"ok" : 0
}
>
>
> db.test.aggregate({$group: {$bad_op: 1}})
{
"errmsg" : "exception: the group aggregate field name $ cannot be an operator name",
"code" : 15950,
"ok" : 0
}