[I] [Variant] Improved API for accessing Variant Objects and lists [arrow-rs]

["alamb (via GitHub)" <gi...@apache.org>]

alamb opened a new issue, #7756:
URL: https://github.com/apache/arrow-rs/issues/7756

   **Is your feature request related to a problem or challenge? Please describe what you are trying to do.**
   
   After @scovich's PR  to validate objects on construction
   - https://github.com/apache/arrow-rs/pull/7704
   
   I expected to be able to use the APIs for variant without havin to check for errors. Also I found the `field_by_name` very confusing as I expected  `get()` to retrieve a field of a Variant object but instead it was called `field_by_name`. 
   
   
   **Describe the solution you'd like**
   I want APIs that are  infallible (don't return errors) so they are easier to work with
   
   
   **Describe alternatives you've considered**
   
   I would personally like to write
   ```rust
   let variant_object = variant.as_object().unwrap()
   // retrieve the value from a field as Option<Variant>
   assert_eq!(variant_object.get("my_field"), Some(Variant::from("foo")));
   // non existent fields return None
   assert_eq!(variant_object.get("my_non_existent)field"), None);
   ```
   
   Likewise for VariantLists I would like to do
   ```rust
   let variant_list = variant.as_list().unwrap();
   // retrieve item at index 1
   assert_eq!(variant_list.get(1), Some(Variant::from("foo")));
   /// non existent items return None (like Rust slices)
   assert_eq!(variant_list.get(100), None);
   ```
   
   
   
   **Additional context**
   I noticed this while working on 
   - https://github.com/apache/arrow-rs/pull/7755
   
   


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Re: [I] [Variant] Improved API for accessing Variant Objects and lists [arrow-rs]

["friendlymatthew (via GitHub)" <gi...@apache.org>]

friendlymatthew commented on issue #7756:
URL: https://github.com/apache/arrow-rs/issues/7756#issuecomment-2998131829

   take


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Re: [I] [Variant] Improved API for accessing Variant Objects and lists [arrow-rs]

["alamb (via GitHub)" <gi...@apache.org>]

alamb commented on issue #7756:
URL: https://github.com/apache/arrow-rs/issues/7756#issuecomment-3130009416

   `label_issue.py` automatically added labels {'parquet'} from #7757


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