Jefffrey commented on code in PR #9283:
URL: https://github.com/apache/arrow-rs/pull/9283#discussion_r2734675854
##########
arrow-row/src/lib.rs:
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@@ -1650,10 +1656,16 @@ fn row_lengths(cols: &[ArrayRef], encoders: &[Encoder])
-> LengthTracker {
.downcast_ref::<UnionArray>()
.expect("expected UnionArray");
+ let mut type_id_to_field_idx = [0usize; 128];
Review Comment:
```suggestion
let mut type_id_to_field_idx = [0usize; i8::MAX as usize];
```
Just to make the limit more clearly obvious
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