I want to extract the filename string as a DateTime column.
The code for it as follows:
@data =
 EXTRACT
 ...
 filename\_date DateTime
 FROM "/input/vga\_{filename\_date}.txt"
 USING Extractors.Tsv(skipFirstNRows:1);

filename = vga\_20171201.txt

whenever i have used datatype as string or int, it's work for me.