Watch values are always evaluated at the scope of the currently selected item in the evaluation context stack. Watch values are automatically updated when stepping to a different subexpression, or when the evaluation context is changed. You can enter scalar as well as table expressions and you can use all DAX functions available and refer to variables within the current evaluation scope. This view allows you to enter any DAX expression, which will be calculated within the current evaluation context. Local values are always evaluated at the currently selected item of the call tree. Values in this list are updated automatically when stepping to a different subexpression, or when the evaluation context is changed. It also displays the value of the current subexpression being debugged. This view lists the columns, measures and variables within the current scope of execution and displays their values. The debugger provides the following views (if they are hidden, they can be accessed through the Debug > Windows menu). Locate the value you want to debug, right-click the cell and choose Debug. Hit F5 to execute the query within Tabular Editor 3.You can use the Performance Analyzer in Power BI Desktop to capture the query generated by visuals. Once the debugger is started, you are presented with a number of new views that provide contextual information about the code being debugged, as well as a DAX script view that highlights the portion of code currently debugged. While Tabular Editor 3 is connected to an instance of Analysis Services, the debugger can be started in one of two different ways: In order for this to work, Tabular Editor 3 must operate in connected or workspace mode, such as when loading model metadata directly from Power BI Desktop or any other instance of Analysis Services. The DAX debugger analyses the DAX code in your model and generates suitable DAX queries for evaluating sub expressions, row contexts, etc., allowing you to step through the code in an interactive fashion. At a conceptual level, the debugger is similar to traditional IDE debuggers, such as the one found in Visual Studio when developing C# applications. Tabular Editor 3 introduces the concept of the DAX debugger, which is a tool that makes the process of stepping into the DAX code of your model, much, much easier. Until now, this "breakdown" of the code was a tedious and time consuming task, which often involved capturing DAX queries executed by client tools, in order to break them down and execute smaller pieces of the queries in DAX Studio or SQL Server Management Studio. In this situation, it is helpful to break down the code, variable by variable and function call by function call, to better understand what is going on. Most data model developers have probably experienced a situation, where the DAX code did not return the expected result. It is no secret that DAX is a relatively complex language which is difficult to master. Information in this article is subject to change as we add more capabilities to the debugger. The DAX debugger was introduced in version 3.2.0.
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