dataframe search from list and all elemts found in a new coloumn in scala : i have a df and i need to search if there is any set of elements from the list of keywords or not .. if yes i need to put all these keywords @ separated in a new coloumn called found or not:
my df is like 
utid|description
123|my name is harry and i live in newyork
234|my neighbour is daniel and he plays hockey

The list is quite big something like list ={harry,daniel,hockey,newyork}

the output should be like
utid|description|foundornot
123|my name is harry and i live in newyork|harry@newyork
234|my neighbour is daniel and he plays hockey|daniel@hockey

the list is quite bug like some 20k keywords 
