Low-level buffer abstractions for Apache Arrow Rust

Byte Storage abstractions

• [MutableBuffer]: Raw memory buffer that can be mutated and grown
• [Buffer]: Immutable buffer that is shared across threads

Typed Abstractions

There are also several wrappers over [Buffer] with methods for easier manipulation:

• [BooleanBuffer][]: Bitmasks (buffer of packed bits)
• [NullBuffer][]: Arrow null (validity) bitmaps ([BooleanBuffer] with extra utilities)
• [ScalarBuffer<T>][]: Typed buffer for primitive types (e.g., i32, f64)
• [OffsetBuffer<O>][]: Offsets used in variable-length types (e.g., strings, lists)
• [RunEndBuffer<E>][]: Run-ends used in run-encoded encoded data