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Define $ifNull behavior if specified field doesn't exist #1452

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Define $ifNull behavior if specified field doesn't exist #1452

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8 changes: 4 additions & 4 deletions source/reference/operator/aggregation/ifNull.txt
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Expand Up @@ -27,10 +27,10 @@ $ifNull (aggregation)

The following aggregation on the ``offSite`` collection
groups by the ``location`` field and returns a count for each
location. If the ``location`` field contains ``null``, the
:expression:`$ifNull` returns ``"Unspecified"`` as the value.
MongoDB assigns the returned value to ``_id`` in the aggregated
document.
location. If the ``location`` field contains ``null`` or does
not exist, the :expression:`$ifNull` returns ``"Unspecified"``
as the value. MongoDB assigns the returned value to ``_id`` in
the aggregated document.

.. code-block:: javascript

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