Dandandan commented on code in PR #9093:
URL: https://github.com/apache/arrow-rs/pull/9093#discussion_r2711117647
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parquet/src/arrow/record_reader/mod.rs:
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@@ -169,7 +176,9 @@ where
/// Returns currently stored buffer data.
/// The side effect is similar to `consume_def_levels`.
pub fn consume_record_data(&mut self) -> V {
- std::mem::take(&mut self.values)
+ // Replace the buffer with a new one that has the same capacity
+ // This avoids reallocations on subsequent batches
+ std::mem::replace(&mut self.values,
V::with_capacity(self.capacity_hint))
Review Comment:
Can we avoid this allocation by moving it to where we write?
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