Column indexing hotfix
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Looks good to me as well but we'll want to add a test indeed.
You can add one if you have time @TevenLeScao.
Otherwise, we'll do it when we are back with Quentin. 
2020-08-06T21:42:21Z
https://github.com/huggingface/datasets/pull/480#issuecomment-670206456
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I fixed it in #494 
2020-08-12T08:36:10Z
https://github.com/huggingface/datasets/pull/480#issuecomment-672734915
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As observed for example in #469 , currently `__getitem__` does not convert the data to the dataset format when indexing by column. This is a hotfix that imitates functional 0.3.0. code. In the future it'd probably be nice to have a test there.