Add `cast_column` to `IterableDataset`
CONTRIBUTOR
Awesome thanks a lot @mariosasko 
2021-12-15T22:35:16Z
https://github.com/huggingface/datasets/pull/3439#issuecomment-995267627
https://api.github.com/repos/huggingface/datasets/issues/3439
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2021-12-15T22:35:16Z
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Closes #3369. 

cc: @patrickvonplaten 