[ARROW-3540] [Rust] Incorporate BooleanArray into PrimitiveArray

• Type: New Feature
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 0.12.0
• Component/s: Rust
• Labels: pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/19855
• Assignee: Paddy Horan
• Reporter: Paddy Horan
• Created: 17/Oct/18 13:04
• Updated: 11/Jan/23 07:28
• Resolved: 17/Oct/18 14:41

Description

Currently we have a specific implementation for `BooleanArray` (bit-packing), but due to the `ArrowPrimitiveType` trait which we use as a trait bound in many places `PrimitiveArray<bool>` is still a valid type.  `make_array` actually uses `PrimitiveArray<bool>` which may be a bug but would be fixed by this issue anyway.

I propose move the implementation of `BooleanArray` into `PrimitiveArray<bool>`, this would allow us to use the `ArrayPrimitiveType` trait as a bound more consistently.  i.e. `PrimitiveArrayBuilder<T>` could return `PrimitiveArray<T>` instead of having a separate `BooleanArrayBuilder`.

Issue Links

• links to: GitHub Pull Request #2778