alamb commented on code in PR #7911:
URL: https://github.com/apache/arrow-rs/pull/7911#discussion_r2211516273


##########
parquet-variant-compute/src/variant_array_builder.rs:
##########
@@ -147,11 +147,9 @@ impl VariantArrayBuilder {
 
     /// Append the [`Variant`] to the builder as the next row
     pub fn append_variant(&mut self, variant: Variant) {
-        // TODO make this more efficient by avoiding the intermediate buffers
-        let mut variant_builder = VariantBuilder::new();
-        variant_builder.append_value(variant);
-        let (metadata, value) = variant_builder.finish();

Review Comment:
   The whole point of this PR is to avoid this copy here and instead write 
directly into the output 



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