yordan-pavlov commented on a change in pull request #8630:
URL: https://github.com/apache/arrow/pull/8630#discussion_r526371625
##########
File path: rust/arrow/src/buffer.rs
##########
@@ -888,6 +888,15 @@ impl MutableBuffer {
}
self.len += bytes.len();
}
+
+ /// Extends the buffer by `len` with all bytes equal to `0u8`,
incrementing its capacity if needed.
+ pub fn extend(&mut self, len: usize) {
+ let remaining_capacity = self.capacity - self.len;
+ if len > remaining_capacity {
+ self.reserve(self.len + len);
Review comment:
@jorgecarleitao good spot - what I suggested is more obvious when len >
remaining_capacity such as if `len = 256` in your example, then requested
capacity would be `54 + (256 - (64 - 54)) = 54 + (256 - 10) = 300`; I think it
will still work even in your example because the requested of 52 capacity will
be lower than existing capacity so no allocation will be performed as it is not
necessary because the requested extension of 8 is smaller than remaining
capacity of 10.
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