[GitHub] flimzy commented on a change in pull request #279: Expand docs on builtin reducers, add _approx_count_distinct

[GitBox <gi...@apache.org>]

flimzy commented on a change in pull request #279: Expand docs on builtin reducers, add _approx_count_distinct
URL: https://github.com/apache/couchdb-documentation/pull/279#discussion_r191261609
 
 

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 File path: src/ddocs/ddocs.rst
 ##########
 @@ -116,17 +116,25 @@ single value - which could be an array or similar object.
 Built-in Reduce Functions
 ^^^^^^^^^^^^^^^^^^^^^^^^^
 
-Additionally, CouchDB has three built-in reduce functions. These are implemented
-in Erlang and run inside CouchDB, so they are much faster than the equivalent
-JavaScript functions: ``_sum``, ``_count`` and ``_stats``. Their equivalents in
-JavaScript:
+Additionally, CouchDB has a set of built-in reduce functions. These are
+implemented in Erlang and run inside CouchDB, so they are much faster than the
+equivalent JavaScript functions.
 
-.. code-block:: javascript
+.. data:: _approx_count_distinct
 
-    // could be replaced by _sum
-    function(keys, values) {
-        return sum(values);
-    }
+Since version `2.2.0`.
 
 Review comment:
   I think we can use the `versionadded` markup for this:
   
       .. versionadded:: 2.2.0

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