How to return a new table after modifying the columns, instead of changing the original table?

Question

How to return a new table without changing the original one when I use tmpTB.replaceColumn!(args)? Is there a parameter like inplace=False in pandas?

Answer 1

In DolphinDB, all the functions with "!" will change the original object. The only function to replace columns is the replaceColumn! function. You can assign the original table to a new table variable before modifying it. Or you can use the copy function as follows:

tmpTB.copy().replaceColumn!(args)