tustvold commented on a change in pull request #6980:
URL: https://github.com/apache/arrow/pull/6980#discussion_r412736972
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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:
That would be incorrect though? The method should write the value `v`
`n` times. Calling `write_bytes(v.to_byte_slice(), n)` would write `v` once and
then increase the recorded element count by n, which would leave things in an
odd state.
For the general case there is no reason for this method to exist, it purely
exists because the bitmap specialization can more efficiently append the same
value multiple times than a naive loop such as this.
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