Hi, I am working on the Movie Review Analysis project with spark dataframe using scala. I was trying to sort the rating column to find out the maximum value but it is throwing "java.lang.NumberFormatException: empty String" exception. Upon going through the data file, I observed that some of the rows have empty rating and runtime values. Can anyone please let me know if the data file which is given is a proper file? If yes, then how to handle NULL or empty values while working with dataframe?