HyukjinKwon opened a new pull request, #48823: URL: https://github.com/apache/arrow/pull/48823
### Rationale for this change Removed a TODO from `replace_with_mask` implementation that asking why the replacements null count wasn't sufficient for a slice operation. When slicing an array, the null count from the original full array doesn't apply to the slice. The null count must be marked as `kUnknownNullCount` and computed lazily when needed. ### What changes are included in this PR? Replaced the TODO with some comments clarifying: - Why manual slicing is used (avoids extra allocation from `ArrayData::Slice()`) - Why `kUnknownNullCount` is necessary (original null count doesn't apply to slice) ### Are these changes tested? No, I did not test. ### Are there any user-facing changes? No. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
