Bug in Dataset.class_encode_column
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This has been fixed in this commit: https://github.com/huggingface/datasets/pull/2254/commits/88676c930216cd4cc31741b99827b477d2b46cb6

It was introduced in #2246 : using map with `input_columns` doesn't return the other columns anymore
2021-04-28T13:12:59Z
https://github.com/huggingface/datasets/issues/2272#issuecomment-828444504
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2021-04-28T13:14:32Z
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## Describe the bug

All the rest of the columns except the one passed to `Dataset.class_encode_column` are discarded.

## Expected results

All the original columns should be kept.

This needs regression tests.
