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DOCSP-1173 Updated according to reviewer's suggestions. #3005

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Oct 12, 2017
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DOCSP-1173 Updated according to reviewer's suggestions. #3005

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8 changes: 6 additions & 2 deletions source/reference/operator/aggregation/bucketAuto.txt
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Expand Up @@ -50,8 +50,7 @@ Definition
Behavior
--------

The number of buckets in the output may be less than the specified
number of buckets, for example:
There may be less than the specified number of buckets if:

- The number of input documents is less than the specified number of
buckets.
Expand All @@ -69,6 +68,11 @@ If the ``groupBy`` expression refers to an array or document, the
values are arranged using the same ordering as in :pipeline:`$sort`
before determining the bucket boundaries.

The even distribution of documents across buckets depends on the
cardinality, or the number of unique values, of the ``groupBy`` field. If
the cardinality is not high enough, the $bucketAuto stage may not evenly
distribute the results across buckets.

Granularity
~~~~~~~~~~~

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