If the results data for a preview data is long for a given column, then whole data of that column is displayed in multiple lines with a wrapping of data. See attached picture.

The result data of a single column can be limited to certain max length say 20 chars, such that no column value wraps into a second row, thus showing at least 15 to 20 rows in the given space. The full data can be shown optionally when user hovers over it. This large amount of data can also pose memory issues in the browser if we are not careful IMO.