Sorry, my question has changed now-
No new item is formed, but it only updates those items which I specify and removes all the rest value in the row.
I got to know it from here -
Site Link - https://www.wix.com/corvid/reference/release-notes/release-notes#release-notes_release-notes_updated-bulkupdate-clarification
Now the problem is that I have 90 columns in my dataset and It is troublesome to specify all of them.