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When users use Composed Data Set, the system will detect the performance of the data set in real time, and make an orange identification of the places that affect the performance, informing the user why the columns have not been pushed down to the database, as shown in the following figure:

As with SQL Data Set, users can also view all performance issues of Composed Data Set by clicking on "Performance Test" in the menu bar.Performance Test dialog box displays the factors that affect SQL performance. The reason that data set cannot be pushed down into the database is displayed first, followed by the performance issues of child nodes. The display sequence of child nodes is random. In the following figure, node "coffee" is displayed before node "test."