alamb opened a new pull request, #9707:
URL: https://github.com/apache/arrow-rs/pull/9707

   # Which issue does this PR close?
   
   - Closes https://github.com/apache/arrow-rs/issues/8808
   
   # Rationale for this change
   
   Inspired by matt in https://github.com/apache/arrow-rs/pull/9692/changes I 
wanted
    to add some helper methods to the PrimitiveArray to make it easier to 
modify in place when possible, and clone when not possible.
   
   # What changes are included in this PR?
   
   Add the equivalent for primitive_array:
   - bitwise_unary_mut_or_clone(self, op) -> Self
   
   More specifically, this adds `PrimitiveArray::unary_mut_or_clone`, 
`PrimitiveArray::try_unary_mut_or_clone`, 
`PrimitiveArray::binary_mut_or_clone`, and 
`PrimitiveArray::try_binary_mut_or_clone`, along with doc examples and 
pointer-reuse tests. It also factors `arrow::compute::binary` through the 
shared `PrimitiveArray` binary implementation.
   
   # Are these changes tested?
   
   Yes.
   
   I ran:
   - `cargo test -p arrow-array`
   - `cargo test -p arrow-array --doc`
   - `cargo test -p arrow-arith`
   - `cargo llvm-cov --html test -p arrow-array`
   
   The new tests check both logical results and whether buffers are reused or 
reallocated using the same `PointerInfo` approach added for `BooleanArray`.
   
   # Are there any user-facing changes?
   
   Yes.
   
   `PrimitiveArray` now has new public helper APIs for in-place mutation with 
an allocating fallback when the array is shared:
   - `unary_mut_or_clone`
   - `try_unary_mut_or_clone`
   - `binary_mut_or_clone`
   - `try_binary_mut_or_clone`
   


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