Dear User Supporter. Thank you for your reply. I had attached some image files.
I have 1 question about deleting dataset in Drill Explorer. I checked https://drill.apache.org/docs/alter-system/ and DROP TABLE can remove dataset from database. So I tried to delete csv file in image1 tree and wrote SQL as image2. I could not find error in executing SQL so it is hard to me why 0_0_144_1.csv folder and its subcategory file cannot be deleted. I also tried to delete it in WinSCP as image3, but it was not possible. It is a little confused as I could add new files in corresponding WinSCP folder even I cannot delete which I had added. (In other words, I could add files in this folder, but not delete them in it) It is very appreciated if I can get feedback to delete specific files from database or correct my program code syntax. Many thanks in advance, Jinseong
