[GitHub] [arrow] jorgecarleitao commented on pull request #8543: ARROW-9361 [Rust] Move array types into their own modules

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jorgecarleitao commented on pull request #8543:
URL: https://github.com/apache/arrow/pull/8543#issuecomment-718835276


   The reason is that there was a private function (`slice_data`) in `array.rs` that was used on two different array types. I moved that function to be part of the `ArrayData`, `ArrayData::slice`, so that it can be used in multiple places (and is really a function that literally slices `ArrayData`). This is change 1.
   
   Since I made `slice` `pub`, I also added a unit test to it (change 2). I also noticed that there was some code duplication between that function (previously in `array.rs`, now in `data.rs`), and thus pulled that duplicated code to a separate function (`count_nulls`) for DRY (change 3). Theses changes implied that the `pub(crate)` data from `ArrayData` was no longer needed to be `pub` at all, and thus I just privatized them (this is not a public change, so all backward compatible), change 4. All these changes are done in the first commit only.
   
   Neither the DRY, unit-testing nor privatization was necessary as part of this PR. I can revert them if you think we should do this cleanup in a separate PR.


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