scovich commented on code in PR #8179:
URL: https://github.com/apache/arrow-rs/pull/8179#discussion_r2292587330


##########
parquet-variant-compute/src/variant_get/output/variant.rs:
##########
@@ -44,40 +85,103 @@ impl OutputBuilder for VariantOutputBuilder<'_> {
         _value_field: &BinaryViewArray,
         typed_value: &ArrayRef,
     ) -> arrow::error::Result<ArrayRef> {
-        // in this case dispatch on the typed_value and
-        // TODO macro'ize this using downcast! to handle all other primitive 
types
         // TODO(perf): avoid builders entirely (and write the raw variant 
directly as we know the metadata is the same)
-        let mut array_builder = VariantArrayBuilder::new(variant_array.len());
         match typed_value.data_type() {
+            DataType::Int8 => {
+                cast_partially_shredded_primitive!(
+                    typed_value,
+                    variant_array,
+                    Int8Type,
+                    DataType::Int8
+                )
+            }

Review Comment:
   I actually suspect `fmt` just plain isn't running, for some reason? I've 
seen other places in this file that aren't formatted as I would have expected.



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