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perf: Use Vec::with_capacity in cast_to_run_end_encoded #8726

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Merged
merged 3 commits into from
Oct 30, 2025
Merged

perf: Use Vec::with_capacity in cast_to_run_end_encoded #8726

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84c4508
perf: Reduce allocations in cast_to_run_end_encoded
vegarsti Oct 27, 2025
97e76df
Merge branch 'main' into cast-ree-allocate
vegarsti Oct 30, 2025
b07e57e
Merge branch 'main' into cast-ree-allocate
vegarsti Oct 30, 2025
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5 changes: 3 additions & 2 deletions arrow-cast/src/cast/run_array.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -136,8 +136,9 @@ pub(crate) fn cast_to_run_end_encoded<K: RunEndIndexType>(

// Partition the array to identify runs of consecutive equal values
let partitions = partition(&[Arc::clone(cast_array)])?;
let mut run_ends = Vec::new();
let mut values_indexes = Vec::new();
let size = partitions.len();
let mut run_ends = Vec::with_capacity(size);
let mut values_indexes = Vec::with_capacity(size);
let mut last_partition_end = 0;
for partition in partitions.ranges() {
values_indexes.push(last_partition_end);
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