Table Api and CSV builder

[Karim Amer]

Hi there 

I Have a CSV file with the timestamp deconstructed into 3 fields and I was 
wondering what is the best way to  specify the those 3 fields are the event  
time ? Should I make extend  CsvTableSource and do the preprocessing or can 
CsvTableSource.builder() handle it. Or is there a better way in general to 
tackle this obstacle.

Thanks