Blizzara commented on code in PR #15049:
URL: https://github.com/apache/datafusion/pull/15049#discussion_r1985164453


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datafusion/functions/benches/character_length.rs:
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@@ -26,6 +28,8 @@ fn criterion_benchmark(c: &mut Criterion) {
     // All benches are single batch run with 8192 rows
     let character_length = datafusion_functions::unicode::character_length();
 
+    let return_type = DataType::Utf8;

Review Comment:
   I tried to look up what the correct return type should be, but there is 
nothing validating that I got it correct nor that it won't get broken in the 
future, e.g. if some of these functions start returning stringview instead. But 
given these are benches, I guess that's fine? If the type is used and wrong, 
presumably it'll complain somewhere, if it's not used and it's wrong it's not 
the end of the world.



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