Use template column_mapping to transmit_format instead of template features
CONTRIBUTOR
Thanks for fixing!
2021-10-15T12:05:19Z
https://github.com/huggingface/datasets/pull/3088#issuecomment-944243189
https://api.github.com/repos/huggingface/datasets/issues/3088
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2021-10-15T12:05:19Z
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Use `template.column_mapping` to check for modified columns since `template.features` represent a generic template/column mapping. 

Fix #3087 


TODO:
- [x] Add a test