rluvaton commented on code in PR #23923:
URL: https://github.com/apache/datafusion/pull/23923#discussion_r3658622043
##########
datafusion/functions-nested/src/empty.rs:
##########
@@ -122,9 +122,17 @@ fn array_empty_inner(args: &[ArrayRef]) ->
Result<ArrayRef> {
}
fn general_array_empty<O: OffsetSizeTrait>(array: &ArrayRef) ->
Result<ArrayRef> {
- let result = as_generic_list_array::<O>(array)?
- .iter()
Review Comment:
calling `iter` on `ListArray` is slow since it slice each list values which
every slice recompute the null count and more
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