askoa commented on code in PR #3158:
URL: https://github.com/apache/arrow-rs/pull/3158#discussion_r1030325680


##########
arrow-array/src/builder/union_builder.rs:
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@@ -47,6 +47,8 @@ trait FieldDataValues: std::fmt::Debug {
     fn append_null(&mut self);
 
     fn finish(&mut self) -> Buffer;
+
+    fn finish_cloned(&self) -> Buffer;

Review Comment:
   Good catch. I have to create a `build_cloned` function in UnionArray.



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