aggregation: treat undefined values the same as null values

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      $group currently doesn't allow for the grouping key to be undefined. The attached script demonstrates the problem, yielding this error for the last two cases:

      {
      "errmsg" : "exception: the _id field for a group must not be undefined",
      "code" : 15956,
      "ok" : 0
      }

        1. unwind1.js
          0.7 kB

              Assignee:
              Mathias Stearn
              Reporter:
              Chris Westin (Inactive)
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                Created:
                Updated:
                Resolved: