bjchambers opened a new issue #940:
URL: https://github.com/apache/arrow-rs/issues/940


   **Describe the bug**
   
   The only commit in this branch 
https://github.com/bjchambers/arrow-rs/tree/reproduce-validation-error 
demonstrates the issue. See the added test 
https://github.com/bjchambers/arrow-rs/blob/reproduce-validation-error/arrow/src/array/data.rs#L1648
 here.
   
   Specifically, it creates a struct array, it slices it, then it gets all of 
the data from that array and attempts to create an identical array data. This 
fails in the validation due as follows:
   
   ```
   thread 'array::data::tests::test_try_new_sliced_struct' panicked at 'called 
`Result::unwrap()` on an `Err` value: InvalidArgumentError("Struct([Field { 
name: \"a\", data_type: Int32, nullable: true, dict_id: 0, dict_is_ordered: 
false, metadata: None }, Field { name: \"b\", data_type: Boolean, nullable: 
true, dict_id: 0, dict_is_ordered: false, metadata: None }]) child array #0 for 
field a has length smaller than expected for struct array (3 < 4)")', 
arrow/src/array/data.rs:1738:10
   stack backtrace:
   ```
   
   
   **To Reproduce**
   Steps to reproduce the behavior:
   
   **Expected behavior**
   The array data can be constructed since it is a copy of existing (valid) 
data.
   
   **Additional context**
   Add any other context about the problem here.
   


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