refactor(rust): Purge arrow-rs support

[orlp]

This was a legacy holdover from before polars-arrow was vendored, we never used this.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.22%. Comparing base (00650b9) to head (94a822e).
Report is 15 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #19312      +/-   ##
==========================================
+ Coverage   80.02%   80.22%   +0.20%     
==========================================
  Files        1528     1523       -5     
  Lines      209871   209495     -376     
  Branches     2419     2434      +15     
==========================================
+ Hits       167954   168073     +119     
+ Misses      41366    40867     -499     
- Partials      551      555       +4     

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[ritchie46]

A rebase away.

[deanm0000]

:(

[eitsupi]

Isn't this a breaking change?

[ritchie46]

For rust it is. And it will be in a major version bump. @deanm0000 did you use this? As it is arrow, you can still use ffi for this.

[deanm0000]

I was using to interop with geoarrow, or try to anyway

[sportfloh]

Hi, @ritchie46
I used this to convert arrow-rs RecordBatches to a polars DataFrame like this:

pub fn record_batch_to_dataframe(batch: &RecordBatch) -> Result<DataFrame, PolarsError> {
    let schema = batch.schema();
    let mut columns = Vec::with_capacity(batch.num_columns());

    for (i, column) in batch.columns().iter().enumerate() {
        let arrow = Box::<dyn polars_arrow::array::Array>::from(&**column);
        columns.push(Series::from_arrow(
            schema.fields().get(i).unwrap().name().into(),
            arrow,
        )?);
    }

    Ok(DataFrame::from_iter(columns))
}

Is there an ffi example? Thanks!