tustvold commented on code in PR #2064:
URL: https://github.com/apache/arrow-rs/pull/2064#discussion_r922269054
##########
arrow/src/compute/kernels/take.rs:
##########
@@ -599,76 +599,68 @@ where
Ok(PrimitiveArray::<T>::from(data))
}
-/// `take` implementation for boolean arrays
-fn take_boolean<IndexType>(
- values: &BooleanArray,
+fn take_bits<IndexType>(
+ values: &Buffer,
+ values_offset: usize,
indices: &PrimitiveArray<IndexType>,
-) -> Result<BooleanArray>
+) -> Result<Buffer>
where
IndexType: ArrowNumericType,
IndexType::Native: ToPrimitive,
{
- let data_len = indices.len();
+ let len = indices.len();
+ let values_slice = values.as_slice();
+ let mut output_buffer = MutableBuffer::new_null(len);
+ let output_slice = output_buffer.as_slice_mut();
- let num_byte = bit_util::ceil(data_len, 8);
- let mut val_buf = MutableBuffer::from_len_zeroed(num_byte);
-
- let val_slice = val_buf.as_slice_mut();
-
- let null_count = values.null_count();
-
- let nulls = if null_count == 0 {
- (0..data_len).try_for_each::<_, Result<()>>(|i| {
- let index = ToPrimitive::to_usize(&indices.value(i)).ok_or_else(||
{
- ArrowError::ComputeError("Cast to usize failed".to_string())
- })?;
+ indices
Review Comment:
This seems to lose the special case of no null values, I would have naively
thought this would make a non-trivial performance difference for the very
common case where there aren't any nulls?
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