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Jul 9, 2021
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DOCSP-10258 window functions #5524

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8 changes: 2 additions & 6 deletions source/reference/operator/aggregation.txt
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Expand Up @@ -1132,15 +1132,11 @@ Alphabetical Listing of Expression Operators
/reference/operator/aggregation/convert
/reference/operator/aggregation/cos
/reference/operator/aggregation/cosh
<<<<<<< HEAD
/reference/operator/aggregation/count-accum
/reference/operator/aggregation/dateAdd
/reference/operator/aggregation/dateDiff
=======
/reference/operator/aggregation/count-accumulator
/reference/operator/aggregation/covariancePop
/reference/operator/aggregation/covarianceSamp
>>>>>>> f7253052c... DOCSP-10258 window functions
/reference/operator/aggregation/dateAdd
/reference/operator/aggregation/dateDiff
/reference/operator/aggregation/dateFromParts
/reference/operator/aggregation/dateSubtract
/reference/operator/aggregation/dateToParts
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89 changes: 0 additions & 89 deletions source/reference/operator/aggregation/count-accum.txt
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13 changes: 11 additions & 2 deletions source/reference/operator/aggregation/count-accumulator.txt
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Expand Up @@ -19,8 +19,7 @@ Definition

Returns the number of documents.

.. admonition:: Disambiguation
:class: note
.. note:: Disambiguation

This page describes the ``$count`` aggregation accumulator. For the
``$count`` aggregation pipeline stage, see :pipeline:`$count
Expand All @@ -47,6 +46,16 @@ Returns the number of documents.

:group:`$count` does not accept any parameters.

Behavior
--------

:group:`$count` is functionally equivalent to using ``{ $sum : 1 }``
within the :pipeline:`$group` stage.

.. seealso::

:group:`$sum`

Examples
--------

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3 changes: 1 addition & 2 deletions source/reference/operator/aggregation/count.txt
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Expand Up @@ -20,8 +20,7 @@ Definition
Passes a document to the next stage that contains a count of the
number of documents input to the stage.

.. admonition:: Disambiguation
:class: note
.. note:: Disambiguation

This page describes the ``$count`` aggregation pipeline stage.
For the ``$count`` aggregation accumulator, see :group:`$count
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3 changes: 1 addition & 2 deletions source/reference/operator/aggregation/first.txt
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Expand Up @@ -23,8 +23,7 @@ documents. Only meaningful when documents are in a defined order.

.. include:: /includes/extracts/fact-aggregation-accumulator-first.rst

.. admonition:: Disambiguation
:class: note
.. note:: Disambiguation

This page describes the :group:`$first` aggregation accumulator. For
the :expression:`$first` array operator, see :expression:`$first
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4 changes: 2 additions & 2 deletions source/reference/operator/aggregation/integral.txt
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Expand Up @@ -59,9 +59,9 @@ documents forming a trapezoid using the:
Specifies the :ref:`expression <aggregation-expressions>` to
evaluate. You must provide an expression that returns a number.

* - :ref:`unit <integral-outputUnit>`
* - :ref:`unit <integral-unit>`

- .. _integral-outputUnit:
- .. _integral-unit:

.. include:: /includes/outputUnit-behavior.rst

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3 changes: 1 addition & 2 deletions source/reference/operator/aggregation/last.txt
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Expand Up @@ -23,8 +23,7 @@ Only meaningful when documents are in a defined order.

.. include:: /includes/extracts/fact-aggregation-accumulator-last.rst

.. admonition:: Disambiguation
:class: note
.. note:: Disambiguation

This page describes the :group:`$last` aggregation accumulator. For
the :expression:`$last` array operator, see :expression:`$last (array
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5 changes: 3 additions & 2 deletions source/release-notes/5.0.txt
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Expand Up @@ -40,8 +40,9 @@ MongoDB 5.0 introduces the following aggregation operators:

* - :group:`$count`
- :group:`$count (aggregation accumulator) <$count>`
provides a count of all documents when used in a
:pipeline:`$group (aggregation) <$group>` pipeline stage.
provides a count of all documents when used in the existing
pipeline :pipeline:`$group (aggregation) <$group>` stage and the
new MongoDB 5.0 :pipeline:`$setWindowFields` stage.

.. note:: Disambiguation

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