gstvg commented on code in PR #6303:
URL: https://github.com/apache/arrow-rs/pull/6303#discussion_r1755004059


##########
arrow-array/src/array/union_array.rs:
##########
@@ -380,6 +392,282 @@ impl UnionArray {
             _ => unreachable!(),
         }
     }
+

Review Comment:
   My attempt to simplify the 3 mask_sparse* below with a helper function led 
to a performance regression



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