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Jun 26, 2012
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SERVER-6131 Correct description of behavior when $unwind is applied to a... #51

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5 changes: 3 additions & 2 deletions source/reference/aggregation.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -406,8 +406,9 @@ The current pipeline operators are:
not an array, :mongodb:func:`aggregate()` generates an error.

- If you specify a target field for :pipeline:`$unwind` that
holds an empty array (``[]``), then the document passes
through unchanged.
holds an empty array (``[]``), then that field is removed
from the result while all other fields are passed through
unchanged.

.. pipeline:: $group

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