Hi Peng,
Copy command will append upsert all data [based on size] to your existing
Cassandra table. Just for testing, I executed before for 500000 data by
using COPY command into small cql table and it work very fine.

Point to make sure :- Please check your primary key before play with COPY


On Tue, Feb 13, 2018 at 12:49 PM, Peng Xiao <2535...@qq.com> wrote:

> Dear All,
> I'm trying to import csv file to a table with copy command?The question is:
> will the copy command clear all the old data in this table?as we only want
> to append the csv file to this table
> Thanks

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