Jefffrey commented on code in PR #19547:
URL: https://github.com/apache/datafusion/pull/19547#discussion_r2658670761
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datafusion/functions/src/string/concat.rs:
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@@ -206,7 +207,11 @@ impl ScalarUDFImpl for ConcatFunc {
DataType::Utf8View => {
let string_array = as_string_view_array(array)?;
- data_size += string_array.len();
+ data_size += string_array
+ .data_buffers()
+ .iter()
+ .map(|buf| buf.len())
+ .sum::<usize>();
Review Comment:
It's a hard tradeoff to be sure as now we have to iterate the whole array 🤔
I would be curious to see what the benchmarks say; I'm not too sure on this
myself, would love it if there were an easy way to estimate view size 😅
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