Re: [I] Regression in parquet reader's handling of non-null children of null parent [arrow-rs]

[via GitHub]

tustvold commented on issue #7119:
URL: https://github.com/apache/arrow-rs/issues/7119#issuecomment-2654025232

   I think the code should be relatively straightforward
   
   ```
   fn project(a: &StructArray, idx: usize) -> Result<ArrayRef, ArrowError> {
       match a.nulls() {
           Some(x) => nullif(a.column(idx), &BooleanArray::new(x.inner().not(), 
None)),
           None => Ok(a.column(idx).clone()),
       }
   }
   ```
   
   I think adding a kernel to union nulls as described in 
https://github.com/apache/arrow-rs/issues/6528 would simplify this down to
   
   ```
   fn project(a: &StructArray, idx: usize) -> Result<ArrayRef, ArrowError> {
       nullify(a.column(idx), a.nulls())
   }
   
   fn nullify(a: &dyn Array, nulls: Option<&NullBuffer>) -> ArrayRef {
       ...
   }
   ```


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