Import_log.py - importing the same access log file twice

I have searched through the general questions and cannot find what I am looking for.

I cannot find the effect or result of importing the same file twice by accident. It seems that when this is done, the aggrigated data is loaded twice, but I cannot find any information about this.

Can someone please advise me what happens if and when the same access.log file is imported twice by accident?

Thanks
Lawrence