Jefffrey commented on code in PR #10364:
URL: https://github.com/apache/arrow-rs/pull/10364#discussion_r3607366931
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parquet/src/arrow/arrow_writer/mod.rs:
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@@ -1834,14 +1834,15 @@ fn get_interval_ym_array_slice(
array: &arrow_array::IntervalYearMonthArray,
indices: impl ExactSizeIterator<Item = usize>,
) -> Vec<FixedLenByteArray> {
- let mut values = Vec::with_capacity(indices.len());
+ const VALUE_SIZE: usize = 12;
+ let mut arena = Vec::with_capacity(indices.len() * VALUE_SIZE);
for i in indices {
- let mut value = array.value(i).to_le_bytes().to_vec();
- let mut suffix = vec![0; 8];
- value.append(&mut suffix);
- values.push(FixedLenByteArray::from(ByteArray::from(value)))
+ let mut out = [0; 12];
+ let value = array.value(i);
+ out[0..4].copy_from_slice(&value.to_le_bytes());
+ arena.extend_from_slice(&out);
Review Comment:
would it make a difference to change arena to `vec![0; indices.len() *
VALUE_SIZE]` then use `copy_from_slice` into offsets to arena to avoid this
intermediate `out`?
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