emilk opened a new issue, #7628:
URL: https://github.com/apache/arrow-rs/issues/7628
## Problem
I have a `mut RecordBatch` and I want to insert a key:value pair into its
metadata.
Currently this is not only very unergonomic, it is also unnecessarily slow:
```rs
let mut new_schema = std::sync::Arc::unwrap_or_clone(record_batch.schema());
new_schema.metadata.insert(key, value);
let record_batch = record_batch
.with_schema(new_schema.into())
.expect("Can't fail");
```
## Wanted solution
Modifying the metadata should not be difficult or slow. I suggest we expose
the RecordBatch metadata with:
```rs
impl RecordBatch {
fn metadata_mut(&mut self) -> &mut HashMap<String, String> {
let schema = Arc::make_mut(&mut self.schema);
&mut schema.metadata
}
}
```
Thus enabling users to just write:
```rs
record_batch.metadata_mut().insert(key, value);
```
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