Hi rajanisqldev-42 ,
Could you please share sink dataset screenshot.
It seems like you might not have provided any filename to the output file and it might be auto-generating the filename and creates a new file each time it runs the pipeline .
If you provide a constant name to the file , it will overwrite the file in the next run as same file name would be already present in the folder .
Hope it helps. Let me know if you have any queries.