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https://issues.apache.org/jira/browse/ARROW-4914?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16795763#comment-16795763
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Neville Dipale commented on ARROW-4914:
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Here's a repro for both this and ARROW-4853 :
[https://gist.github.com/nevi-me/3bc0885eb7d5f4da2e7c1bec48940e82]
> [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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