parquet: convert Bytes to ByteArray directly

[dopelsunce]

Is your feature request related to a problem or challenge? Please describe what you are trying to do.

I'm using SerializedFileWriter to write byte arrays to parquet files in my project which implements a C# binding to the parquet crate. I find it difficult to construct ByteArray from raw bytes received across FFI. A conversion path from bytes::Bytes to ByteArray would be really useful.

Right now, ByteArray only supports conversion from Vec<u8> and &str.

Describe the solution you'd like

Implement From<Bytes> for ByteArray,

Describe alternatives you've considered

For now, I'm using util::memory::ByteBufferPtr hidden behind the experimental feature flag to achieve this goal.

Additional context

I find ByteArray is a wrapper around Bytes. Short term, we can add trait From<Bytes> for ByteArray.

In comments above ByteBufferPtr,

TODO: Remove and replace with [bytes::Bytes]".

I agree ideally we should remove the internal struct ByteBufferPtr.

[tustvold]

label_issue.py automatically added labels {'parquet'} from #3720