markap14 commented on code in PR #6778:
URL: https://github.com/apache/nifi/pull/6778#discussion_r1084257475
##########
nifi-docs/src/main/asciidoc/record-path-guide.adoc:
##########
@@ -1071,6 +1071,37 @@ take the value of the supplied record path and use it as
the namespace.
Please note that the namespace must always be a valid UUID string. An empty
string, another data type, etc. will result
in an error. This is by design because the most common use case for UUID v5 is
to uniquely identify records across data sets.
+
+=== count
+
+Returns the count of the number of elements. This is commonly used in
conjunction with arrays. For example, if we have the following record:
+
+----
+{
+ "id": "1234",
+ "elements": [{
+ "name": "book",
+ "color": "red"
+ }, {
+ "name": "computer",
+ "color": "black"
+ }]
+}
+----
+
+We could determine the number of `elements` by using the `count` function.
Using:
+
+----
+count(/elements[*])
+----
+
+Would yield a value of `2`. We could also use this as a filter, such as:
+----
+/id[ count(/elements[*]) ]
Review Comment:
Good catch
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