How to join two datasets?
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['Hi this is also my question. thanks '
 'Hi ! Currently the only way to add new fields to a dataset is by using `.map` and picking items from the other dataset\r\n'
 'Closing this one. Feel free to re-open if you have other questions about this issue.\r\n\r\nAlso linking another discussion about joining datasets: #853 ']
Hi,

I'm wondering if it's possible to join two (preprocessed) datasets with the same number of rows but different labels? 

I'm currently trying to create paired sentences for BERT from `wikipedia/'20200501.en`, and I couldn't figure out a way to create a paired sentence using `.map()` where the second sentence is **not** the next sentence (i.e., from a different article) of the first sentence.

Thanks!
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