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https://issues.apache.org/jira/browse/ARROW-4914?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16795770#comment-16795770
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Chao Sun commented on ARROW-4914:
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Thanks [~nevi_me]! I think the failure for this JIRA is because {{is_null}} and
{{is_valid}} in {{Array}} do not consider offset, the second failure is because
the invariant check in {{From<ArrayDataRef> for ListArray}} is wrong. Both
should be an easy fix. Will post a PR soon.
> [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
>
> 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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