jecsand838 commented on code in PR #8348:
URL: https://github.com/apache/arrow-rs/pull/8348#discussion_r2360030559


##########
arrow-avro/src/codec.rs:
##########
@@ -1149,6 +1345,67 @@ impl<'a> Maker<'a> {
             return self.resolve_primitives(write_primitive, read_primitive, 
reader_schema);
         }
         match (writer_schema, reader_schema) {
+            (Schema::Union(writer_variants), Schema::Union(reader_variants)) 
=> {
+                match (
+                    nullable_union_variants(writer_variants.as_slice()),
+                    nullable_union_variants(reader_variants.as_slice()),
+                ) {
+                    (Some((w_nb, w_nonnull)), Some((_r_nb, r_nonnull))) => {
+                        let mut dt = self.make_data_type(w_nonnull, 
Some(r_nonnull), namespace)?;
+                        dt.nullability = Some(w_nb);
+                        Ok(dt)
+                    }
+                    _ => self.resolve_unions(
+                        writer_variants.as_slice(),
+                        reader_variants.as_slice(),
+                        namespace,
+                    ),
+                }
+            }
+            (Schema::Union(writer_variants), reader_non_union) => {
+                let mut writer_to_reader: Vec<Option<(usize, Promotion)>> =
+                    Vec::with_capacity(writer_variants.len());

Review Comment:
   Thats a bad habit I have during development to keep track of types. I'll 
remove this as well.



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