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https://issues.apache.org/jira/browse/ARROW-11061?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17255926#comment-17255926
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Neville Dipale commented on ARROW-11061:
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[~andygrove] [~alamb] [~jorgecarleitao] I don't know if you've encountered the
issues above, but they're making my work veery difficult on the parquet writer.
There are equivalent checks in the C++ implementation, but I haven't looked at
them in detail yet.
> [Rust] Validate array properties against schema
> -----------------------------------------------
>
> Key: ARROW-11061
> URL: https://issues.apache.org/jira/browse/ARROW-11061
> Project: Apache Arrow
> Issue Type: Improvement
> Components: Rust
> Reporter: Neville Dipale
> Priority: Major
>
> We have a problem when it comes to nested arrays, where one could create a
> <list[null]<primitive[non-null]>> where the array fields can't be null, but
> the list can have null slots.
> This creates a lot of work when working with such nested arrays, because we
> have to create work-arounds to account for this, and take unnecessarily
> slower paths.
> I propose that we prevent this problem at the source, by:
> * checking that a batch can't be created with arrays that have incompatible
> null contracts
> * preventing list and struct children from being non-null if any descendant
> of such children are null (might be less of an issue for structs)
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