Dear everyone in the Mailing list:
It is easy to get the unique elements in a column. But I would like to get rid
of those rows that the elements of this column are redundant. Or sometimes, to
have a look at the rows that the elements of this column are redundant is also
important. I guess it boils down to throw out the index of the redundant
elements.
With millions of rows, how can I efficiently perform the task?
Thank you in advance.
Boshao
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