[jira] [Created] (ARROW-11061) [Rust] Validate array properties against schema

["Neville Dipale (Jira)" <ji...@apache.org>]

Neville Dipale created ARROW-11061:
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             Summary: [Rust] Validate array properties against schema
                 Key: ARROW-11061
                 URL: https://issues.apache.org/jira/browse/ARROW-11061
             Project: Apache Arrow
          Issue Type: Improvement
            Reporter: Neville Dipale


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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