klion26 commented on issue #8289:
URL: https://github.com/apache/arrow-rs/issues/8289#issuecomment-3264427700

   @scovich I can help to fix this, it's straightforward to fix the empty map 
case, for the `MapArray` with a `NULL` row, we need to return `NULL` for 
top-level and `Variant::NULL` for nested-level. Can we assume that the first 
call to the function 
`parquet-variant-compute/src/cast_to_variant.rs#cast_to_variant` is the top 
level, and the recursive calll from `cast_to_variant` to the function as the 
nested level?
   


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