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https://issues.apache.org/jira/browse/ARROW-4914?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17661936#comment-17661936
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Rok Mihevc commented on ARROW-4914:
-----------------------------------
This issue has been migrated to [issue
#21423|https://github.com/apache/arrow/issues/21423] on GitHub. Please see the
[migration documentation|https://github.com/apache/arrow/issues/14542] for
further details.
> [Rust] Array slice returns incorrect bitmask
> --------------------------------------------
>
> Key: ARROW-4914
> URL: https://issues.apache.org/jira/browse/ARROW-4914
> Project: Apache Arrow
> Issue Type: Bug
> Components: Rust
> Affects Versions: 0.13.0
> Reporter: Neville Dipale
> Priority: Blocker
> Labels: beginner
>
> Slicing arrays changes the offset, length and null count of their array data,
> but the bitmask is not changed.
> This results in the correct null count, but the array values might be marked
> incorrectly as valid/invalid based on the old bitmask positions before the
> offset.
> To reproduce, create an array with some null values, slice the array, and
> then dbg!() it (after downcasting).
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