Allow constant integer in $group clause

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      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

            Assignee:
            [DO NOT USE] Backlog - Query Optimization
            Reporter:
            Renato Riccio
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              Created:
              Updated: