Avoid a clone when creating UnionArray from ArrayData
#9188
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alamb
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alamb
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Jan 15, 2026
| for (cd, (field_id, _)) in data.child_data().iter().zip(fields.iter()) { | ||
| boxed_fields[field_id as usize] = Some(make_array(cd.clone())); | ||
| for (cd, (field_id, _)) in child_data.into_iter().zip(fields.iter()) { | ||
| boxed_fields[field_id as usize] = Some(make_array(cd)); |
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this saves a clone of ArrayData (which each requires a Vec allocation) for each child of the UnionArray
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alamb
commented
Jan 16, 2026
| } | ||
| Self { | ||
| data_type: data.data_type().clone(), | ||
| data_type, |
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this saves a call of DataType::drop
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Looks good 🚀 |
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Which issue does this PR close?
make_array) #9061ArrayData(speed up reading from Parquet reader) #9058Rationale for this change
Let's make arrow-rs the fastest we can and the fewer allocations the better
What changes are included in this PR?
Apply pattern from #9114
Are these changes tested?
Existing tests
Are there any user-facing changes?
No