HaoYang670 opened a new issue, #2156:
URL: https://github.com/apache/arrow-rs/issues/2156
**Is your feature request related to a problem or challenge? Please describe
what you are trying to do.**
Currently, the string builder uses the list builder:
```rust
pub struct GenericStringBuilder<OffsetSize: OffsetSizeTrait> {
builder: GenericListBuilder<OffsetSize, UInt8Builder>,
}
```
This requires another child array to be built, which leads to more memory
overhead.
**Describe the solution you'd like**
I want the string builder to use the binary array.
Also I hope there would be some performance improvement in the
`bench_string`. (At least, there should be no performance regression)
**Describe alternatives you've considered**
We could not do this if there is performance regression.
**Additional context**
Add any other context or screenshots about the feature request here.
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