Implement ArrowWriter pooling
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- Dominant language
- Rust
- Stars
- 58
- Forks
- 50
- PR merge metrics
- No merged PRs in 30d
Description
### Search before asking
- [x] I searched in the [issues](https://github.com/apache/fluss-rust/issues) and found nothing similar.
### Description
Java pools ArrowWriter instances per table/schema via ArrowWriterPool. Reused writers keep their allocated vectors and seed the fullness threshold from the previous batch (recordsCount / 2), avoiding reallocation and the first-record size check on every new batch. We currently create a fresh MemoryLogRecordsArrowBuilder per batch.
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- [x] I'm willing to submit a PR!
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