[GitHub] [arrow-rs] kawadakk opened a new issue, #4600: `new_null_array` generates an invalid union array

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

kawadakk opened a new issue, #4600:
URL: https://github.com/apache/arrow-rs/issues/4600

   **Describe the bug**
   `new_null_array` generates a union array that fails validation by `ArrayData::validate_full`.
   
   **To Reproduce**
   Modify [`test_null_union`](https://github.com/apache/arrow-rs/blob/16744e5ac08d9ead6c51ff6e08d8b91e87460c52/arrow-array/src/array/mod.rs#L819-L845) as follows: 
   ```rust
   #[test]
   fn test_null_union() {
       for mode in [UnionMode::Sparse, UnionMode::Dense] {
           let data_type = DataType::Union(
               UnionFields::new(
                   vec![2, 1],
                   vec![
                       Field::new("foo", DataType::Int32, true),
                       Field::new("bar", DataType::Int64, true),
                   ],
               ),
               mode,
           );
           let array = new_null_array(&data_type, 4);
   
           let array = as_union_array(array.as_ref());
           assert_eq!(array.len(), 4);
           assert_eq!(array.null_count(), 0);
   
           for i in 0..4 {
               let a = array.value(i);
               assert_eq!(a.len(), 1);
               assert_eq!(a.null_count(), 1);
               assert!(a.is_null(0))
           }
   
           array.to_data().validate_full().unwrap(); // <---- new
       }
   }
   ```
   
   This will fail with the following output: ``thread 'array::tests::test_null_union' panicked at 'called `Result::unwrap()` on an `Err` value: InvalidArgumentError("Sparse union child array #1 has length smaller than expected for union array (0 < 4)")', arrow-array\src\array\mod.rs:852:45``
   
   **Expected behavior**
   Producing a valid array
   
   **Additional context**
   <!--
   Add any other context about the problem here.
   -->


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[GitHub] [arrow-rs] tustvold closed issue #4600: `new_null_array` generates an invalid union array

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

tustvold closed issue #4600: `new_null_array` generates an invalid union array
URL: https://github.com/apache/arrow-rs/issues/4600


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[GitHub] [arrow-rs] tustvold commented on issue #4600: `new_null_array` generates an invalid union array

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

tustvold commented on issue #4600:
URL: https://github.com/apache/arrow-rs/issues/4600#issuecomment-1678652046

   `label_issue.py` automatically added labels {'arrow'} from #4601


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