Dispersion measures in the arr namespace not externally available

[etiennebacher]

Checks

• I have checked that this issue has not already been reported.
• I have confirmed this bug exists on the latest version of Polars.

Reproducible example

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Log output

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Issue description

This might be a documentation issue, I'm not sure.

std, var and median functions for the arr namespace were added in #13245, but they do not appear in the list of implementations: https://docs.rs/polars/latest/polars/prelude/struct.ArrayNameSpace.html#implementations

Am I missing something?

For context, I noticed this when adding the arr namespace in r-polars. Other functions (max, sum, unique, etc.) are found but I get the error "no method named std found for struct polars::prelude::ArrayNameSpace in the current scope". Note that I use rust-polars 0.37.0, not the dev version, but those measures were implemented before the 0.37.0 release.

Expected behavior

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Installed versions

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[ritchie46]

They are available on the Lazy API. Dispatch to those expressions in done via the engine.

[etiennebacher]

I think the issue is that those functions were not yet added in the Array namespace for the version of rust-polars that I use. This is weird because I use the commit tagged in rs-0.37.0, which includes the PR "list & array measures of dispersion"

However, if I navigate the repo at the commit tagged in rs-0.37.0, we can see that those changes are not included: https://github.com/pola-rs/polars/blob/rs-0.37.0/py-polars/src/expr/array.rs

[etiennebacher]

I suppose there's not much to do here, I can wait for 0.38.0