Merge pull request #112987 from djpmsft/docUpdates

collect()

Author: PRMerger18

articles/data-factory/data-flow-expression-functions.md

@@ -117,6 +117,13 @@ Returns the first not null value from a set of inputs. All inputs should be of t
 * ``coalesce(10, 20) -> 10``
 * ``coalesce(toString(null), toString(null), 'dumbo', 'bo', 'go') -> 'dumbo'``
 ___
+### <code>collect</code>
+<code><b>collect(<i>&lt;value1&gt;</i> : any) => array</b></code><br/><br/>
+Collects all values of the expression in the aggregated group into a array. Structures can be collected and transformed to alternate structures during this process. The number of items will be equal to the number of rows in that group and can contain null values. The number of collected items should be small
+* ``collect(salesPerson)``
+* ``collect(firstName + lastName))``
+* ``collect(@(name = salesPerson, sales = salesAmount) )``
+___
 ### <code>columnNames</code>
 <code><b>columnNames(<i>&lt;value1&gt;</i> : string) => array</b></code><br/><br/>
 Gets all output columns for a stream. You can pass a optional stream name as the second argument.