Weijun-H commented on code in PR #9110:
URL: https://github.com/apache/arrow-datafusion/pull/9110#discussion_r1476921297
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datafusion/physical-expr/src/array_expressions.rs:
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@@ -2246,38 +2246,41 @@ fn generic_list_cardinality<O: OffsetSizeTrait>(
}
// Create new offsets that are euqiavlent to `flatten` the array.
-fn get_offsets_for_flatten(
- offsets: OffsetBuffer<i32>,
- indexes: OffsetBuffer<i32>,
-) -> OffsetBuffer<i32> {
+fn get_offsets_for_flatten<O: OffsetSizeTrait>(
+ offsets: OffsetBuffer<O>,
+ indexes: OffsetBuffer<O>,
+) -> OffsetBuffer<O> {
let buffer = offsets.into_inner();
- let offsets: Vec<i32> = indexes.iter().map(|i| buffer[*i as
usize]).collect();
+ let offsets: Vec<O> = indexes
+ .iter()
+ .map(|i| buffer[i.to_usize().unwrap()])
Review Comment:
We cannot cast it as usize directly because `*i` is `OffsetSizeTrait`
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