comphead commented on code in PR #6065:
URL: https://github.com/apache/arrow-datafusion/pull/6065#discussion_r1171840645
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datafusion/core/src/physical_plan/aggregates/row_hash.rs:
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@@ -772,22 +773,22 @@ fn slice_and_maybe_filter(
filter_opt: Option<&Arc<dyn Array>>,
offsets: &[usize],
) -> Result<Vec<ArrayRef>> {
- let sliced_arrays: Vec<ArrayRef> = aggr_array
- .iter()
- .map(|array| array.slice(offsets[0], offsets[1] - offsets[0]))
- .collect();
+ let null_array = Arc::new(NullArray::new(0)) as ArrayRef;
+ let mut sliced_arrays: Vec<ArrayRef> = vec![null_array; aggr_array.len()];
Review Comment:
The key point is to get rid of extra allocations
https://github.com/apache/arrow-datafusion/issues/5969#issuecomment-1504585917
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