Merge pull request #110794 from kromerm/markadf001

Update concepts-data-flow-expression-builder.md

Author: PRMerger9

articles/data-factory/concepts-data-flow-expression-builder.md

@@ -6,13 +6,15 @@ ms.author: makromer
 ms.reviewer: daperlov
 ms.service: data-factory
 ms.topic: conceptual
-ms.date: 12/9/2019
+ms.date: 04/08/2020
 ---
 
 # Build expressions in mapping data flow
 
 In mapping data flow, many transformation properties are entered as expressions. These expressions are composed of column values, parameters, functions, operators, and literals that evaluate to a Spark data type at run time.
 
+> [!VIDEO https://www.microsoft.com/en-us/videoplayer/embed/RE4tkur]
+
 ## Open Expression Builder
 
 The expression editing interface in the Azure Data Factory user experience is known as Expression Builder. As you enter your expression logic, Data Factory uses [IntelliSense](https://docs.microsoft.com/visualstudio/ide/using-intellisense?view=vs-2019) code completion for highlighting, syntax checking, and autocompleting.