The data preview is a useful option in the Query Panel when we want to get a preview of the data; that is, see the raw data before it gets fetched and formatted in the table.
This option is great for getting a "sense" of the data, if the values we expect to be returned are actually these.
This feature can also be useful when we want to make sure a specific value was returned by the query but isn't shown in the report results for some reason, for example, a local report filter.
We will click on the Refresh option located to the upper-right corner of the Data Preview window.
Now, we will be able to see that this pane is populated with the row data, as shown in the following screenshot:
