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DOCS-8419: Aggregation compatibilty changes for $unwind #3012

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DOCS-8419: Aggregation compatibilty changes for $unwind #3012

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6 changes: 6 additions & 0 deletions source/release-notes/3.2-compatibility.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -130,6 +130,12 @@ Aggregation Compatibility Changes
expression, use the :expression:`$literal` operator to create a
literal value.

- :pipeline:`$unwind` no longer errors on non-array operands. If the operand
does not resolve to an array but is not missing, null, or an empty array,
:pipeline:`$unwind` treats the operand as a single element array.
Previously, if a value in the field specified by the field path was *not* an
array, :method:`db.collection.aggregate()` generated an error.


.. _3.2-spidermonkey-compatibility:

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