alamb commented on code in PR #16877:
URL: https://github.com/apache/datafusion/pull/16877#discussion_r2228560541
##########
datafusion/functions/src/unicode/character_length.rs:
##########
@@ -136,56 +136,31 @@ where
// string is ASCII only is relatively cheap.
// If strings are ASCII only, count bytes instead.
let is_array_ascii_only = array.is_ascii();
- let array = if array.null_count() == 0 {
+ let nulls = array.nulls().cloned();
+ let array = {
if is_array_ascii_only {
let values: Vec<_> = (0..array.len())
.map(|i| {
- let value = array.value(i);
+ // Safety: we are iterating with array.len() so the index
is always valid
+ let value = unsafe { array.value_unchecked(i) };
T::Native::usize_as(value.len())
})
.collect();
- PrimitiveArray::<T>::new(values.into(), None)
+ PrimitiveArray::<T>::new(values.into(), nulls)
} else {
let values: Vec<_> = (0..array.len())
.map(|i| {
- let value = array.value(i);
+ // Safety: we are iterating with array.len() so the index
is always valid
Review Comment:
Another idea here is if you know the values are always ascii, you can avoid
making a `&str` at all -- and instead simply compute the character lengths
based on the offsets array (for StringArray and LargeStringArray) or the views
for `StringViewArray)
##########
datafusion/functions/src/unicode/character_length.rs:
##########
@@ -136,56 +136,31 @@ where
// string is ASCII only is relatively cheap.
// If strings are ASCII only, count bytes instead.
let is_array_ascii_only = array.is_ascii();
- let array = if array.null_count() == 0 {
+ let nulls = array.nulls().cloned();
Review Comment:
Is the idea to remove the no-nulls optimization because it doesn't make
things faster?
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