arrow2 0.9.1

Unofficial implementation of Apache Arrow spec in safe Rust
Documentation
# Summary

- [Arrow2]./README.md
- [The arrow format]./arrow.md
- [Low-level API]./low_level.md
- [High-level API]./high_level.md
- [Compute]./compute.md
- [Metadata]./metadata.md
- [Foreign interfaces]./ffi.md
- [Extension]./extension.md
- [IO]./io/README.md
    - [Read CSV]./io/csv_reader.md
    - [Write CSV]./io/csv_write.md
    - [Read Parquet]./io/parquet_read.md
    - [Write Parquet]./io/parquet_write.md
    - [Read Arrow]./io/ipc_read.md
    - [Read Arrow stream]./io/ipc_stream_read.md
    - [Write Arrow]./io/ipc_write.md
    - [Read Avro]./io/avro_read.md
    - [Write Avro]./io/avro_write.md
    - [Read JSON]./io/json_read.md
    - [Write JSON]./io/json_write.md