scovich commented on code in PR #9820:
URL: https://github.com/apache/arrow-rs/pull/9820#discussion_r3149095014
##########
arrow-buffer/src/buffer/mutable.rs:
##########
@@ -583,7 +586,11 @@ impl MutableBuffer {
/// Extends the buffer by `additional` bytes equal to `0u8`, incrementing
its capacity if needed.
#[inline]
pub fn extend_zeros(&mut self, additional: usize) {
- self.resize(self.len + additional, 0);
+ let new_len = self
+ .len
+ .checked_add(additional)
+ .expect("buffer length overflow");
Review Comment:
Yeah... arguably the guidelines say we should be returning an error here
(because asking for too many entries is a form of invalid input), but it
certainly complicates the API. I don't know if there's a way to provide a
fallible version of this API, for paranoid consumers to use?
I do agree it should be a very rare error, but I've also been unpleasantly
surprised at how often 32-bit StringArray offsets blow up in practice.
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