alamb opened a new pull request, #8065:
URL: https://github.com/apache/arrow-rs/pull/8065

   # Which issue does this PR close?
   
   We generally require a GitHub issue to be filed for all bug fixes and 
enhancements and this helps us generate change logs for our releases. You can 
link an issue to this PR using the GitHub syntax.
   
   - Related to https://github.com/apache/arrow-rs/pull/8021
   
   # Rationale for this change
   
   As part of the review in https://github.com/apache/arrow-rs/pull/8021, 
@scovich  and I were discussing how `VariantArray::value` should behave in the 
presence of nulls:  
https://github.com/apache/arrow-rs/pull/8021#discussion_r2256914173
   
   > Suggest to make this return Option<Variant> so callers don't have to check 
for null themselves.
   
   I realized it might not be 100% clear that the existing convention in this 
crate was that `value()` methods did not check for nulls / return `Option`.  I 
think we should document it better
   
   # What changes are included in this PR?
   
   Explicitly document that `value` methods do not check for nulls and explain 
what happens when they are used on null values
   
   # Are these changes tested?
   
   Yes, by CI
   
   # Are there any user-facing changes?
   
   Additional documentation. No behavior changes


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