Dandandan commented on a change in pull request #8485:
URL: https://github.com/apache/arrow/pull/8485#discussion_r535140816
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File path: rust/arrow/src/array/builder.rs
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@@ -253,8 +253,18 @@ pub trait BufferBuilderTrait<T: ArrowPrimitiveType> {
}
impl<T: ArrowPrimitiveType> BufferBuilderTrait<T> for BufferBuilder<T> {
- default fn new(capacity: usize) -> Self {
- let buffer = MutableBuffer::new(capacity *
mem::size_of::<T::Native>());
+ #[inline]
+ fn new(capacity: usize) -> Self {
+ let buffer = if T::DATA_TYPE == DataType::Boolean {
Review comment:
@jorgecarleitao
I see this in profiling for the BufferBuilderTrait append function:
Which accounts for ~9% of the instruction fetches according to callgrind
when running the TPHC 12 benchmark.
So it seems the `if T::DATA_TYPE == DataType::Boolean` is not being
optimized out and goes into the partial eq implementation (or the profiler is
wrong), maybe because the implementation there is not easy to optimize /
specialize for this case. I will check if another implementation (pattern
match?) solves this.
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