tustvold commented on a change in pull request #6980:
URL: https://github.com/apache/arrow/pull/6980#discussion_r413987657
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File path: rust/arrow/src/array/builder.rs
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@@ -236,6 +251,14 @@ impl<T: ArrowPrimitiveType> BufferBuilderTrait<T> for
BufferBuilder<T> {
self.write_bytes(v.to_byte_slice(), 1)
}
+ default fn append_n(&mut self, n: usize, v: T::Native) -> Result<()> {
+ self.reserve(n)?;
+ for _ in 0..n {
+ self.write_bytes(v.to_byte_slice(), 1)?;
+ }
Review comment:
When unoptimised both forms contain a checked_add, it is just hard to
see as the foreach+closure isn't inlined, and the codegen for the iterator form
is significantly worse in general. When optimised the codegen is identical for
both forms.
Given this, I'm inclined to optimise for readability and use the simpler
form, but ultimately it is up to you as the maintainers :)
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