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[jira] [Created] (ARROW-3540) [Rust] Incorporate BooleanArray into PrimitiveArray

Paddy Horan created ARROW-3540:

             Summary: [Rust] Incorporate BooleanArray into PrimitiveArray
                 Key: ARROW-3540
                 URL: https://issues.apache.org/jira/browse/ARROW-3540
             Project: Apache Arrow
          Issue Type: New Feature
          Components: Rust
            Reporter: Paddy Horan
            Assignee: Paddy Horan

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`.

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