Metadata for each column
COLLABORATOR
Hi! Indeed it would be useful to support this. PyArrow natively supports schema-level and column-level metadata, so implementing this should be straightforward. The API I have in mind would work as follows:
```python
col_feature = Value("string", metadata="Some column-level metadata")

features = Features({"col": col_feature}, metadata="Some schema-level metadata")
```

WDYT?
2023-02-27T14:27:26Z
https://github.com/huggingface/datasets/issues/5575#issuecomment-1446420940
https://api.github.com/repos/huggingface/datasets/issues/5575
IC_kwDODunzps5WNqHM
https://api.github.com/repos/huggingface/datasets/issues/comments/1446420940/reactions
2023-03-05T16:01:33Z
https://api.github.com/repos/huggingface/datasets/issues/comments/1446420940
https://avatars.githubusercontent.com/u/47462742?v=4
https://api.github.com/users/mariosasko/events{/privacy}
https://api.github.com/users/mariosasko/followers
https://api.github.com/users/mariosasko/following{/other_user}
https://api.github.com/users/mariosasko/gists{/gist_id}
https://github.com/mariosasko
mariosasko
MDQ6VXNlcjQ3NDYyNzQy
https://api.github.com/users/mariosasko/orgs
https://api.github.com/users/mariosasko/received_events
https://api.github.com/users/mariosasko/repos
https://api.github.com/users/mariosasko/starred{/owner}{/repo}
https://api.github.com/users/mariosasko/subscriptions
User
https://api.github.com/users/mariosasko
public
NONE
Sorry for the late reply, 
Yes, I think this is the most straight-forward approach with the things that we already have.


2023-03-05T11:53:33Z
https://github.com/huggingface/datasets/issues/5575#issuecomment-1455069131
https://api.github.com/repos/huggingface/datasets/issues/5575
IC_kwDODunzps5WupfL
https://api.github.com/repos/huggingface/datasets/issues/comments/1455069131/reactions
2023-03-05T11:53:33Z
https://api.github.com/repos/huggingface/datasets/issues/comments/1455069131
https://avatars.githubusercontent.com/u/11356471?v=4
https://api.github.com/users/parsa-ra/events{/privacy}
https://api.github.com/users/parsa-ra/followers
https://api.github.com/users/parsa-ra/following{/other_user}
https://api.github.com/users/parsa-ra/gists{/gist_id}
https://github.com/parsa-ra
parsa-ra
MDQ6VXNlcjExMzU2NDcx
https://api.github.com/users/parsa-ra/orgs
https://api.github.com/users/parsa-ra/received_events
https://api.github.com/users/parsa-ra/repos
https://api.github.com/users/parsa-ra/starred{/owner}{/repo}
https://api.github.com/users/parsa-ra/subscriptions
User
https://api.github.com/users/parsa-ra
public
NONE
@mariosasko Let me know how I can help.
2023-03-10T17:04:04Z
https://github.com/huggingface/datasets/issues/5575#issuecomment-1464104025
https://api.github.com/repos/huggingface/datasets/issues/5575
IC_kwDODunzps5XRHRZ
https://api.github.com/repos/huggingface/datasets/issues/comments/1464104025/reactions
2023-03-10T17:04:04Z
https://api.github.com/repos/huggingface/datasets/issues/comments/1464104025
https://avatars.githubusercontent.com/u/11356471?v=4
https://api.github.com/users/parsa-ra/events{/privacy}
https://api.github.com/users/parsa-ra/followers
https://api.github.com/users/parsa-ra/following{/other_user}
https://api.github.com/users/parsa-ra/gists{/gist_id}
https://github.com/parsa-ra
parsa-ra
MDQ6VXNlcjExMzU2NDcx
https://api.github.com/users/parsa-ra/orgs
https://api.github.com/users/parsa-ra/received_events
https://api.github.com/users/parsa-ra/repos
https://api.github.com/users/parsa-ra/starred{/owner}{/repo}
https://api.github.com/users/parsa-ra/subscriptions
User
https://api.github.com/users/parsa-ra
public
NONE
Hi, is this feature to be implemented in the near future? It would be really nice if that would be the case! 
2023-12-04T20:28:01Z
https://github.com/huggingface/datasets/issues/5575#issuecomment-1839422686
https://api.github.com/repos/huggingface/datasets/issues/5575
IC_kwDODunzps5to1ze
https://api.github.com/repos/huggingface/datasets/issues/comments/1839422686/reactions
2023-12-04T20:28:01Z
https://api.github.com/repos/huggingface/datasets/issues/comments/1839422686
https://avatars.githubusercontent.com/u/44208384?v=4
https://api.github.com/users/mmlynarik/events{/privacy}
https://api.github.com/users/mmlynarik/followers
https://api.github.com/users/mmlynarik/following{/other_user}
https://api.github.com/users/mmlynarik/gists{/gist_id}
https://github.com/mmlynarik
mmlynarik
MDQ6VXNlcjQ0MjA4Mzg0
https://api.github.com/users/mmlynarik/orgs
https://api.github.com/users/mmlynarik/received_events
https://api.github.com/users/mmlynarik/repos
https://api.github.com/users/mmlynarik/starred{/owner}{/repo}
https://api.github.com/users/mmlynarik/subscriptions
User
https://api.github.com/users/mmlynarik
public
NONE
Hi, I also need this feature for tell my customer if any of the feature is encrypted with a certain key. 
2024-01-05T21:48:34Z
https://github.com/huggingface/datasets/issues/5575#issuecomment-1879294203
https://api.github.com/repos/huggingface/datasets/issues/5575
IC_kwDODunzps5wA8D7
https://api.github.com/repos/huggingface/datasets/issues/comments/1879294203/reactions
2024-01-05T21:48:34Z
https://api.github.com/repos/huggingface/datasets/issues/comments/1879294203
https://avatars.githubusercontent.com/u/1153820?v=4
https://api.github.com/users/felixgao/events{/privacy}
https://api.github.com/users/felixgao/followers
https://api.github.com/users/felixgao/following{/other_user}
https://api.github.com/users/felixgao/gists{/gist_id}
https://github.com/felixgao
felixgao
MDQ6VXNlcjExNTM4MjA=
https://api.github.com/users/felixgao/orgs
https://api.github.com/users/felixgao/received_events
https://api.github.com/users/felixgao/repos
https://api.github.com/users/felixgao/starred{/owner}{/repo}
https://api.github.com/users/felixgao/subscriptions
User
https://api.github.com/users/felixgao
public
### Feature request

Being able to put some metadata for each column as a string or any other type.


### Motivation

I will bring the motivation by an example, lets say we are experimenting with embedding produced by some image encoder network, and we want to iterate through a couple of preprocessing and see which one works better in our downstream task, here as workaround right now what I do is the compute the hash of the preprocessing that the images went through as part of the new columns name, it would be nice to attach some kinda meta data in these scenarios to the each columns. metadata

### Your contribution

Maybe we could map another relational like database as the metadata? 